pdc question papers

7/28/2019 PDC question papers

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Code No: C9909/RR RR

II B.Tech II Semester Supplementary Examinations, Apr/May 2012ELECTRICAL TECHNOLOGY

( Common to Electronics & Communication Engineering, Computer Science& Engineering, Information Technology, Computer Science & Systems

Engineering, Electronics & Telematics, Electronics & Computer Engineeringand Instrumentation & Control Engineering)

Time: 3 hours Max Marks: 80Answer any FIVE Questions

All Questions carry equal marks

1. (a) State the reasons for a self exited DC shunt generator to fail to build upvoltage, and suggest the necessary modifications.

(b) Explain the importance of critical field resistance and how it can be deter-mined.

(c) A 4-pole generator having wave-wound armature winding has 48 slots each slotcontains 20 conductors. What will be the voltage generated in the machinewhen driven at 1,500rpm assuming the flux per pole to be 7.0 mWb? [7+3+6]

2. (a) Explain the various methods of speed control of a D.C. Shunt Motor.

(b) A 460V d.c. series motor runs at 1000rpm taking a current of 40A. Calculate

the speed and percentage change in torque if the load is reduced so that themotor is taking 30A. Total resistance of the armature and field circuits is 0.8.Assume flux is proportional to the field current. [8+8]

3. (a) Explain the principle of operation of transformer. Derive its e. m. f. equation.

(b) A 1-phase transformer has 180 turns respectively in its secondary and primarywindings. The respective resistances are 0.233 and 0.067.Calculate the equivalent resistance of

i. the primary in terms of the secondary winding,

ii. the secondary in terms of the primary winding, and

iii. the total resistance of the transformer in terms of the primary. [8+8]

4. (a) Define regulation of a transformer. Derive the expression for the regulation.[2+4]

(b) Explain with neat circuit diagrams, the open circuit and short circuit tests tobe carried out in the laboratory on a 1.5 kVA, 230 V / 40 V, 50 Hz, 1-phasetransformer, for the determination of the parameters of the equivalent circuit.

[10]

5. (a) Explain the principle of rotating magnetic field and hence prove that it is of

constant magnitude and rotates at synchronous speed.(b) A 3-phase, 4 pole 50 Hz induction motor has a full-load speed of 1440 r.p.m.


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Code No: C9909/RR RR

i. full-load slip and rotor frequency

ii. speed of stator field with respect toA. stator structure and

B. rotor structure and

iii. speed of rotor field with respect to

A. rotor structure

B. stator structure and

C. stator field. [8+8]

6. (a) Explain the tests to be conducted for determining synchronous impedance.

(b) A 100KVA, 6.6KV, 3phase star connected synchronous generator has a syn-chronous reactance of 25 ohm per phase. It supplies full load current at 0.75p.f lagging and a rated terminal voltage. Compute the terminal voltage forthe same excitation when the generator supplies full load current at 0.8 p.fleading. [8+8]

7. (a) A 3-, 6600v; 50Hz; Y connected synchronous motor takes 50 A current.The resistance and synchronous reactance per phase are 1 ohm and 20 re-spectively. Find the power supplied to the motor and induced e.m.f. for apowerfactor of

i. 0.8 lagging and

ii. 0.8 leading.

(b) Derive expressions for distribution factor and pitch factor. [8+8]

8. (a) Single phase induction motors are not self starting. Explain Why?

(b) How is single-phase induction motors made self started? Explain one method.[8+8]


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Code No: R22013

II B.Tech II Semester, Regular Examinations, April 2012

MANAGERIAL ECONOMICS AND FINANCIAL ANALYSIS(Com. to CE, MM)

Time: 3 hours Max. Marks: 75

Answer any FIVE QuestionsAll Questions carry Equal Marks

~~~~~~~~~~*~~~~~~~~~~~

1. a) Economics is not only a science but also an art. Discuss?b) Briefly Explain the Nature of Economic Laws

2. What is the meaning of Demand in Economics? And also explain Demand Function and itsimportance?

3. Explain the salient features of Perfect and Imperfect Markets?4. a) Define Partnership. Explain its Advantages?

b) Define Private Company. Explain its Characteristics?

5. a) For every debit there is a credit. Illustrate your answer?b) What are the advantages of double entry system?

6. a) What is ratio? How the ratios are expressedb) What are turnover ratios? Explain their significance?

7. a) What are the limitations of the break even charts?b) From the following information calculate

i) PV Ratio ii) Break Even Point (BEP) iii) Margin of Safety

Total sales 3, 60,000

Selling price per unit 100

Variable cost per unit 50

Fixed cost 1, 00,000

8. a) What are the important steps involved in the capital budgeting?b) Briefly explain payback period?

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~~~~~~~~~~~*~~~~~~~~~~

1. a) Define Managerial Economics? What are the basic tools in Managerial Economics?b) Explain the various methods of Demand Forecasting?

2. a) Explain derived demand and autonomous demand?b) Explain the differences between Producers Goods and Consumers Goods?

3. Distinguish between Market Price, Short Period Price and Long Period Price. Draw suitableDiagrams?

4. Distinguish between Production Cost and Selling Cost. How does Selling Cost influence theequilibrium of a firm?

5. a) What are the differences between the Journal and Ledger?b) How do you Balance the Accounts?

6. a) What is a Funds Flow Statement? How it is Prepared?b) Explain the Procedure to prepare funds from operations?

7. a) A company is considering an investment proposal to install a new machine. The project costis Rs. 50,000. The life period of the project is 5 years. The companys Tax rate is 50%. The

firm uses straight lines depreciation. The estimated cash flows before tax (CFBT) are as

follows.

Compute ARR

b) Explain Advantages and disadvantages of ARR

8. Explain briefly various subsidiary books and also explain its advantages?

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Year CFBT

1 10,000

2 11,000

3 14,000

4 15,000

5 25,000

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Code No: R22013


MANAGERIAL ECONOMICS AND FINANCIAL ANALYSIS

(Com. to CE, MM)



~~~~~~~~~~~*~~~~~~~~~~

1. a) Distinguish between Macro and Micro Economics and explain how they are Interdependent?b) What are the uses of Managerial Economics?

2. Explain the Law of Demand and point out its assumptions?3. What do you understand by equilibrium of firm and industry? What are the conditions of such

equilibrium under perfect competition?

4. Explain how price is determined under oligopoly?5. a) What is trial balance? Explain its advantages

b) What are the points to be considered in preparation of trial balance?

6. a) What is capital budgeting. Explain its significance and its importance?b) Briefly Explain NPV and IRR

7. a) Distinguish between Trade Discount and Cash Discountb) Enter the following in the purchase book

8. a) Explain the importance of Ledgerb) State the procedure for writing Journal?

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~~~~~~~~~~~*~~~~~~~~~~

1. a) Explain how Economic Theories are applied to business analysis?b) Discuss the Methods of Economic Analysis?

2. Explain the concept of elasticity of Demand. How it is measured?3. How is value determined under monopoly? Give suitable Diagram?4. a) What is a business cycle? What are its characteristics?

b) Describe briefly the different phases of the Trade Cycles?

5. a) Explain the importance and purpose of Final Accounts?b) What is Revenue Account? Explain its objectives?

6. a) What are the causes for changes in working capital? How these changes be shown in astatement?

b) Distinguish between funds flow statement and Profit and Loss Account?

7. From the following details prepare statement of proprietors funda) Stock Velocity 6 times

b) Debtors Velocity 2 Months

c) Capital Turnover 2 times

d) Creditors Velocity 73 days

e) Fixed assets turnover 4 times

f) Gross profit ratio 20%

Gross Profit was Rs. 60,000. Reserves and surpluses amounted to Rs. 20,000 closing stock was

Rs. 5,000 in excess of opening stock.

8. Explain the uses of break even analysis in profit planning?

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Code No: R22053


DATA BASE MANAGEMENT SYSTEMS

(Com. to CSE, IT)Time: 3 hours Max. Marks: 75

Answer any FIVE Questions

All Questions carry Equal Marks~~~~~~~~~~~*~~~~~~~~~~

1. a) What is DBMS? Briefly describe about aggregations.b) What is a participation constraint? Briefly describe class hierarchies.

2. a) What is ODBC? Describe its usage and role when working with database applicationprograms.

b) What is storage manager? Briefly describe the components of storage manager.

3. a) What is View? With an example briefly describe updatable views.b) For the relational schema: Emp(eid: integer, ename: string, age: integer, salary: real)Works(eid: integer, did: integer, pcttime: integer) Dept(did: integer, dname: string, budget: real,

managerid: integer) Answer the following:

i) Give an example of a foreign key constraint that involves the Dept relation. What are the

options for enforcing this constraint when a user attempts to delete a Dept tuple?ii) Write the SQL statements required to create the preceding relations, including

appropriate versions of all primary and foreign key integrity constraints.

iii) Define the Dept relation in SQL so that every department is guaranteed to have amanager.

iv) Write an SQL statement to add John Doe as an employee with eid = 101, age = 32 and

salary = 15, 000.

4. a) What is grouping? Is there a counterpart in relational algebra? Explain this feature, anddiscuss the interaction of the HAVING and WHERE clauses.

b) What are triggers? Briefly describe uses of triggers

5. a) What is lossless join? Briefly describe problems caused by redundancy.b) What is BCNF? What is the motivation for putting a relation in BCNF? What is themotivation for 3NF? In what way 3NF is different from BCNF.

6. a) What is precedence graph? Briefly describe the process to test the serializability of theschedule.

b) What is fail stop assumption? Briefly describe failure classification.

7. a) What is a heap file? What is data entry? What is an index? List the three main alternativesfor what to store as a data entry in an index.

b) Briefly describe Tree-structured index.

8. a) What is the intuition behind tree structured indexes? Why are they good for range selection?b) What is index? Why indexing is require? Briefly describe any one static index structure.

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1. a) What are the main components of a DBMS? Briefly explain them.b) With an example, briefly describe Entity vs Relationship and Entity vs Attribute.

2. a) What is physical data independence? Briefly describe declarative DMLs.b) What is an integrity constraint? Briefly describe different integrity constraints.

3. a) With an example describe creating and modifying relations using SQL.b) Does the relational model, as seen by an SQL query writer, provide physical and logical dataindependence? Explain.

4. a) With an example, briefly describe the process to obtain a set of tuples as the result of a SQLQuery?

b) With examples and syntax, briefly describe SQL aggregate operators.

5. a) What is dependency preservation? With an example, briefly describe functionaldependencies.

b) What is decomposition and how it is related to redundancy? What problems may be caused

by the use of decomposition?

6. a) What is stable storage? Briefly describe stable storage implementation.b) What is recoverable schedule? Briefly describe recovery algorithm.

7. a) What is a heap file? Briefly describe the operations associated with heap file with un-clustered tree index.

b) What is hashing? With a neat diagram, briefly describe tree based indexing.

8. With an example, describe in detail about ISAM index structure.

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1. a) What is relationship? Briefly describe the additional features of ER model.b) Briefly describe the different types of Database users.

2. a) What is weak entity? With an example briefly describe Binary Vs Ternary relationships.b) What is a view? What is data independence? In what way view is related to data

independence?

3. a) What are integrity constraints? Define primary key constraint and foreign key constraint.How these constraints are expressed in SQL?

b) With an example, describe the difference between tuple relational calculus and domain

relational calculus.

4. a) What types of SQL constraints can be specified using the query language? Can you expressprimary key constraints using one of these new kinds of constraints? If so, why does SQL

provide for separate primary key constraints syntax?

b) With an example, briefly describe the parts of a basic SQL Query. Are the input and result

tables of an SQL Query sets or multisets?

5. a) What is dependency? Briefly describe about multi-valued dependencies and Fourth NormalForm.

b) When is decomposition is said to be dependency preserving? Why is this property useful?

Explain.

6. a) List the ACID properties. Explain the importance of each.b) What is serializability? With an example briefly describe conflict serializability.

7. a) What is file organization? Describe the operations to consider for comparing fileorganizations.b) Briefly describe heap files and sorted files.

8. a) What is indexing? Briefly describe the main characteristics of B+ Tree.b) What is tree structured indexing? Briefly describe ISAM.

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1. a) What is WAL Property, and with an example, briefly describe its importance.b) What is Transaction management? Briefly describe Query Processor.

2. a) What is entity set? With an example describe Ternary relationship set.b) What are descriptive attributes? Briefly describe functions of DBA

3. a) What are the SQL constructs to modify the structure of tables and destroy tables and views?Describe what happens when destroy a view.b) What is join operation and why it is required? With an example, briefly describe condition

join, natural join and equijoin.

4. a) What operations does SQL provide over (multi) sets of tuples, and how would you use thesein writing Queries?

b) What are null values? Are they supported in the relational model? How do they affect the

meaning of queries?

5. a) What is functional dependency? Why some functional dependencies are called trivial? Givea set of FDs for the relation schema R (A, B, C, D) with primary key AB under which R is in

1NF but not in 2NF.

b) What is attribute closure? Briefly describe about Armstrongs axioms.

6. a) What is view serializability? In what way it is different from conflict serializability? Give anexample for each, i.e., view and conflict serializability.

b) What is inconsistent state? Briefly describe the properties required for database system to

ensure integrity.

7. a) What is indexed file organization? Briefly describe clustered indexes.b) What is primary index? In what way primary index is different from secondary and uniqueindexes? Briefly describe hash based indexing.

8. With an example, describe in detail about B+ Tree index structure.1 of 1

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Code No: R22021


PULSE AND DIGITAL CIRCUITS

(Com. To EEE, ECE, ECC, BME, EIE)


Answer anyFIVE

QuestionsAll Questions carry Equal Marks

~~~~~~~~~~*~~~~~~~~~~~

1. a) The square wave asshown in fig.1.1 is fed to an RC integrating circuit. Compute and plotthe output wave forms if, i) RC=2T; ii) RC = T/2

b) Derive an expression for the output of a high pass circuit excited by a ramp input.

2. a) Draw the circuitof slicer circuit using zener diodes and explain its operation with the help oftheir transfer characteristics.

b) In the fig.2.1 shown below, 0,1,10,,100 ====== rrfs VfCKRRRR . A

symmetrical square wave signal of amplitude 20V and frequency 5 KHz is applied at t = 0.

Draw the output waveform

3. a) Write short notes oni) Diode switching times

ii) Transistor switching times

b) Explain the operation of a two input TTL logic gate with open collector configuration.

What are the applications of open collector gates.

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Fig.1.1

Fig.2.1


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4. a) Explain the working ofSchmitt trigger with wave forms. Give its applications.b) Germanium transistors with 40(min) =FEh are used in the fixed bias flip-flop with collector

catching diodes. The circuit parameters are, KRKRVVVV CBBCC 5,5.1,6,18 1 ==== and

R2 = 25K. Find the stable state voltages and currents.

5. a) Show that the Astablemultivibrator works as Voltage controlled oscillator.b) Design a one shot circuit to produce a pulse width of 5 msec. Assume hFE =30,

VCE(sat)=0.3V, VBE(sat)=0.7V,IC=5 mA,VCC=6V,VBB=1.5V,Q1 ON and Q2 OFF.

6. a) Derive therelation between the slope, transmission and displacement errors.b) Draw a miller time base circuit and explain its operation. Compare its performance with

that of UJT relaxation oscillator.

7. a) Explain the synchronization of a sweep circuit with symmetrical signals.b) Explain the operation of unidirectional diode sampling gates with waveforms. Illustrate the

effect of different levels of control voltage on gate output. Discuss its advantages and

disadvantages.

8. Write shortnotes on any three of the followinga) Double differentiator

b) Diode comparators

c) Four diode sampling gates

d) Diode controlled Astable blocking oscillator

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Code No: R22021





Answer anyFIVE


~~~~~~~~~~*~~~~~~~~~~~

1. a) Obtain an expression for rise time rt of an RC low pass filter in terms of upper 3 dBfrequency f2.

b) A signal Tt

eVtV

= .)( is applied to a double differentiator. Find the output if

2211 CRCRT == . Plot the response.

2. a) For the circuit shown in fig.2.2 below, the input is a 20V step. Calculate and plot to scale theout put voltage?

b) With the help of a neat circuit diagram explain the working of a two level diode clipper.

3. a) Describe the switching times of BJT by considering the charge distribution across the baseregion. Explain this for cut-off, active and saturation regions.

b) Give the comparison between TTL, ECL & CMOS logic families.

4. a) With the help of a circuit diagram, explain the working of a collector coupled monostablemultivibrator and also derive an expression for the gate width?

b) Design an Astable multivibrator to give an output with 100 msec ON period and 50 msec.

OFF period for VCC = 15V, hFE = 50, Ic(sat) = 100A.

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Fig.2.2


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Code No: R22021

5. a) Draw the circuit diagram of Bootstrap time base generator and explain its operation withnecessary waveforms.

b) Compare the voltage and current time base generators with some examples.

6. a) Explain the function of bi-directional sampling gates using transistors. What are thetechniques employed to cancel the pedestal.

b) Write the working of a monostable blocking oscillator (emitter timing) with neat circuit

diagram & waveforms. And derive an expression for the pulse width.

7. a) Explain the terms Phase delay and Phase jitters.b)With the help of circuit diagram and waveforms explain frequency division by an Astable

multivibrator.

8. Write short notes on any three of the followinga) Emitter- coupled clipper

b) Ringing circuit.

c) Triggering methods used in multivibrators

d) Chopper amplifier

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Code No: R22021





Answer anyFIVE


~~~~~~~~~~*~~~~~~~~~~~

1. a) Prove that for any periodic input waveform the average level of the steady state output signalfrom the RC high pass circuit is always zero.

b) Derive an expression for the rise time of the output of a low pass RC circuit excited by a

step input.

2. a) Draw the basic circuit diagram of negative peak clamper circuit and explain its operation.b) The input voltage Vi to the two level clipper is shown in fig.2.3 below varies linearly from 0

to 200V. Sketch the output voltage Vo to the same scale as the input voltage.

3. a) Give the expression for rise time and fall time in terms of transistor parameters and operatingcurrents.

b) Explain the following: i) DTL NAND gate; ii) RTL NOR gate And also prove NAND gates

and NOR gates are universal gates

4. a) Explain the operation of fixed-bias binary with a triggering circuit and waveforms.b) Design a Schmitt trigger circuit to have UTP=6V and LTP=3V using silicon transistor

Whose HFE(min)=40. Assume necessary data.

5. a) What are the reasons for nonlinearity of sweep in current time base generators and explainhow to rectify.

b) With the help of circuit diagram explain the principle of operation of a constant current

sweep circuit.

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Code No: R22021

6. a) Describe the method involved in the synchronization of voltage sweep waveform with asinusoidal synchronization signal with neat waveforms. Infer the conditions to be fulfilled for

perfect synchronization from the waveforms.b) Describe the method of synchronization of astable multivibrator with neat waveforms.

7. a) Describe the operation of Bidirectional sampling gate using two diodes and derive theexpression for gain, Vc(min) and V n(min)

b) Explain the working of an RC-controlled Astable blocking oscillator with the help of

circuit diagram and waveforms.

8. Write short notes on any three of the following.a) RL and RLC circuits

b) Phase delay & phase jittersc) balanced choppers.

d) Transistorized Miller time base generator

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Code No: R22021





Answer anyFIVE


~~~~~~~~~~*~~~~~~~~~~~

1. a) Prove that a low pass RC circuit with a large time constant acts as an integrator.b) Derive the expression for percentage tilt of a square wave output of RC high pass circuit.

2. a) State and prove clamping circuit theorem.b) What are the different techniques used for temperature compensation of clippers?

c) Write short notes on transistor clippers.

3. a) Explain the terms pertaining to transistor switching characteristics.i) Rise time; ii) Delay time; iii)Storage time; iv) Fall timeb)Draw a positive NAND gate with diodes and transistor (DTL) and explain its operation What

is meant by Fan out? Explain how to improve Fan out of the gate.

4. a) Explain the reason for the occurrence of overshoot at the base of normally ON transistor ofone shot. Derive an expression for overshoot.

b) Consider a collector-coupled astable multivibrator using n-p-n silicon transistor. The circuit

and device parameters are VCC =6 V, RC =560 , R=5.6 k, C=50 pF, hFE =40, rbb= 100.

Calculate the waveforms at the base and the collector of one transistor and plot to scale. Also

find the recovery time and frequency of oscillations

5. a) Draw and explain the operation of a constant current sweep circuit and derive the expressionfor sweep voltage.

b) How the linearity can be corrected through the adjustment of driving waveform.

c) For the bootstrap sweep generator 1 KHz symmetrical square wave is applied. The circuit

details are given below. Find the sweep amplitude, retrace time and recovery time.

VVVVfCKRKRKR EECCBE 10&10,07.0,10,10,5 ======

Assume ====

KhKhhh ieoerefe 1,351,102,50

4

6. a) Illustrate the terms synchronization and frequency division of a sweep generator.b)With the help of neat waveforms explain sine wave frequency division with a sweep circuit.

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7. Explain the operation of,a) monostable transistor blocking oscillator (base timing) with a circuit diagram and wave

forms. Derive an expression for pulse width.b) Four diode sampling gate and discuss its properties.

8. Write short notes on any three of the followinga) RLC Ringing circuit

b) Double differentiator

c) Emitter coupled cipper

d) Gated Astable multivibrator

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Code No: R22033


THERMAL ENGINEERING -I

(Com. to ME, AME)



~~~~~~~~~~*~~~~~~~~~~~

1. a) What is the difference between air standard cycle approximation, fuel-air cycleapproximation and real cycle performance?

b) List and discuss various losses occurring in the actual engine operation. Explain the effect of

time losses with the help of a p-v diagram. (6M+9M)

2. a) Explain the need and importance of cooling in an IC engineb) Explain thermosyphon system of cooling with neat diagram (5M+10M)

3. a) What are the different stages in combustion in SI engine and how much Quantity of heat isreleased in different stages.

b) Write a short note on flame propagation. (8M+7M)

4. a) Explain with figure various types of combustion chambers used in CI enginesb) Bring out clearly the process of combustion in CI engines and also explain various stages of

combustion (7M+8M)

5. a) What is the significance of conducting the Morse Test? Explain in detail.b) The following observations were recorded during a trial of a four stroke, single cylinder oil

engine. Duration of the test is 45 min; oil consumption is 4 liters; calorific value of the oil is

43MJ/Kg; specific gravity of the fuel =0.8: area of the indicator is 8.5cm2; length of the

indicator diagram =8.5 cm spring constant = 5.5bar/cm; brake load=150kg; spring balance

reading =21kg; effective brake wheel diameter =1.5m (5M+10M)

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6. A trial on a 2-stroke single acting reciprocating air compressor gave the following data.Free air delivered = 6m

3/min at pressure and temperature 1bar and 27

oc

Delivery pressure 40bar

Speed 400r.p.mIntermediate pressure 6 bar

Temperature at inlet to second stage 27oc

Law of compression pv1.3

const

Mechanical efficiency 80%

Stroke of the compressor L.P = Diameter of the LP=Stroke of HP

Calculate i) cylinder diameter ii) power required. Neglect clearance. (15M)

7. The following data pertain to a centrifugal compressorTotal pressure ratio 3.6:1

Diameter of inlet eye of the impeller 95cmAxial velocity at inlet 140 m/sec

Mass flow 12kg/sec

The velocity in delivery duct 120m/sec

Tip speed of impeller n 760m/sec

Speed of impeller 16000 rpm

Total head isentropic efficiency 80%

Pressure coefficient 0.73

Ambient conditions 1.013 bar and 150c

Calculate

i) The static pressure and temperature at inlet and outlet of compressor,

ii) The static pressure ratio,

iii) Work of compressor /kg of air and

iv) The theoretical power required. (15M)

8. a) What do you mean by surging & choking?b) An axial flow compressor with an overall isentropic efficiency of 85% draws air at 20C and

compresses it in the pressure ratio of 4:1. The mean blade speed and flow velocity are constant

throughout the compressor. Assuming 50% reaction balding and taking blade velocity as 180

m/s. and work input factor as 0.82. Calculate i) Flow velocity and ii) the number of stages

Take = 12, = 42 and Cp = 1.005 KJ/kg K. (5M+10M)

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Code No: R22033



(Com. to ME, AME)



All Questions carry Equal Marks

~~~~~~~~~~*~~~~~~~~~~~

1. a) Why the actual cycle efficiency is much lower than air stand cycle efficiency?b) Differentiate between the actual and ideal cycles and the factors responsible. (8M+7M)

2. a) Draw a neat sketch of fuel pump for CI engine and Explainb) Explain the principle of scavenging and its importance (8M+7M)

3. a) What are the desirable qualities of si engine fuels to inhibit detonation.b) Explain the effect of different operating parameters on Flame propagation velocity.

(7M+8M)

4. a) Explain the stages of combustion in CI engine with the help of suitable sketches.b) Explain M combustion chamber and list its advantages. (10M+5M)

5. A 6 cylinder gasoline engine operates on the 4-stroke cycle. The bore of the each cylinder is80mm and the stroke is 100 mm. The clearance volume per cylinder is 70 cm3. At a speed of

400 rpm the fuel consumption is 20 kg/h and the torque developed is 150 N-m. Calculate.

i) Brake power,

ii) Brake mean effective pressure

iii) Brake thermal efficiency. If the calorific value of the fuel is 43000 KJ/kg

iv) The relative efficiency on a brake power basis, assume the engine works on constant

volume cycle r = 1.4 for air. (15M)

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Code No: R22033

6. a) Determine the expression for the work done of the single stage compressor with perfect intercooling.

b) A single stage double acting compressor is required to deliver 14m3

of air per min measuredat 1.013bar and 15

oc. the delivery pressure is 7 bar. And speed of the compressor is 300rpm.

Take clearance volume as 5%of swept volume with compression and expansion n=1.3.

Calculate i) Swept volume of a cylinder. ii) Delivery temperature iii) Indicated power.

(7M+8M)

7. a) Write the classification of rotary compressors and explain working principle of roots blowerwith neat sketch

b) A roots blower compresses 0.08m3

of air from1 bar to1.5 bar/rev. calculate compressor

efficiency (10M+5M)

8. in an eight stage axial flow compressor the overall stagnation pressure ratio achieved is 5:1with an overall isentropic efficiency of 92% .the inlet stagnation pressure &temperature are

1bar and 290k.the work is divided equally between the stages. The mean blade speed is

160m/sec And 50%eaction design issued. The axial velocity throughout the compressor is

constant and is equal to 90m/sec calculate

i) The blade angles

ii) The power required (15M)

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Code No: R22033



(Com. to ME, AME)




~~~~~~~~~~*~~~~~~~~~~~

1. a) What are i) Pumping losses ii) rubbing friction losses and iii) exhaust blow down loss.b) Explain how the composition of exhaust gases in a petrol engine varies with respect to

air/fuel ratios (9M+6M)

2. a) What are the parts that required lubrication in an IC engineb) What are the types of lubricating systems? Explain splash and pressure system with neat

diagram (5M+10M)

3. a) Draw the schematic diagrams of I-type, L-type, F-type combustion chamber and comparethe salient features among them.

b) Discuss the methods for improving the anti-knock quality of a SI engine fuel. (7M+8M)

4. a) What is meant by ignition delay or ignition lag? it is usually divided into two chambersname and describe them.

b) With the aid of a neat sketch, explain the squish in C.I engines. (8M+7M)

5. The following observations were data refer to an oil engine working on Otto cycleBrake power=14.7kW

Suction pressure=0.9bar

Mechanical efficiency=80%

Index of compression curve=1.35Index of expansion curve=1.3

Maximum explosion pressure=24 bar

Engine speed=1000 rpm

Ratio of stroke=1.5

Find diameter and stroke of piston (15M)

1 of 2

R10 SET - 3


24/56

Code No: R22033

6. a) prove that the volumetric efficiency of single stage compressor is given by vol= 1+k-k(p2/p1)1/n

b) A multistage air compressor is to be designed to evaluate the pressure from 1 bar to 125bar

such that stage pressure ratio will not exceed 4 determine

i) no of stages

ii) exact pressure ratio

iii) intermediate pressure. (7M+8M)

7. a) Derive an expression for efficiency of Roots blower in terms of pressure ratio and ratio ofspecific heats.

b) A rotary compressor receives air at 1 bar and 170C and delivers it at a pressure of 6 bar.

Determine per kg of air delivered, work done by the compressor and heat exchanged with the

jacket water when the compression is isothermal, isentropic by the relation PV1.6

=constant.

(6M+9M)

8. a) Explain the working principle of axial flow compressor with neat sketch. (10M+5M)b) Write the differences between centrifugal and axial flow compressors

2 of 2

R10 SET - 3


25/56

Code No: R22033



(Com. to ME, AME)



~~~~~~~~~~*~~~~~~~~~~~

1. a) Explain about heat loss factor (8M+7M)b) What are the requirements of ignition system in IC engines

2. a) Clearly explain wet sump lubrication system with a sketch.b) Briefly discuss the air fuel ratio requirement of a petrol engine from no load to full load.

(8M+7M)

3. a) What are the different stages in combustion in SI engine and how much quantity of heat isreleased in different stages.

b) Write a short note on flame propagation. (8M+7M)

4. a) How to achieve air swirl in combustion chamber of S.I engine?b) How does combustion takes place in C.I. engine (7M+8M)

5. a) The power of a six cylinder four stroke direct injection oil engine is absorbed by a waterbrake for which, B.P. = WN / 20,000, where W is the brake load in Newton and N is the speed

in R.P.M. The air consumption was measured by an air-box sharp edged orifice system. The

bore is 95 mm, stroke 120 mm, speed 2400 R.P.M, orifice diameter 30 mm, orifice coefficient

of discharge 0.6, C/H ratio by mass in fuel 83/17, brake load 550 N, fuel density 0.831kg/m3.

Calculate BMEP, torque, BSFC and volumetric efficiency. Assume any missing data suitably.

b) List the various methods for measuring friction power of an engine. (10M+5M)

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Code No: R22033

6. a) Show that the conditions for minimum work of the compressor P2= (P1P3)1/2b) an air compressor takes in air at 1bar and 20

oc and compresses it according to the law pv

1.2

=const. it is then delivered to a receiver at a constant pressure of 10 bar. R=0.287 kJ/Kg.k .

Determine i) Temperature at the end of the compression ii) Work done and heat transfer during

compression / kg of air. (7M+8M)

7. a) Write the classification of rotary compressors and explain working principle of roots blowerwith neat sketch



efficiency (10M+5M)

8. a) Explain with a neat sketch the working an axial flow compressor.b) An axial flow compressor with compression ratio as 5 draws air at 20

0C delivers at 50

0C.

Assuming 50% degree of reaction. Find the velocity of flow if the blade velocity is 100 m/s

also find the number of stages, take work factor= 0.85, =100,=40

0,Cp=1KJ/Kg.k (7M+8M)

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Code No: T0122

II B.Tech II Semester, Supplementary Examinations, April - 2012

STRENGTH OF MATERIALS-II(Civil Engineering)



Assume missing data suitably

******0*******

1. Identify Principal planes and estimate Principal stresses and maximum shear stress on amember subjected to two perpendicular stresses 100 N /mm

2(tensile) and 25 N /mm

2

(Tensile). Draw diagram showing the position of Principal planes. The member is also

subjected to a shearing stress of 10 N/mm2.

2. A 50 kW has to be transmitted at 150 R.P.M. Find the necessary diameter of solid circularshaft. Find necessary hollow shaft with internal diameter equal to 0.75 times of externaldiameter. What will be the % savings in the weight of the shaft? Allowable shear stress is 90

N/mm2

and density is 7.5 g/cm3.

3. An open coiled helical spring is made of 7.5 mm diameter wire has 15 coils and 50mm meandiameter with each coil makes an angle of 30

0with the plane perpendicular to the axis of the

spring. Determine the load required to elongate the spring by 20mm and the bending and

shear stresses caused by that load. E = 2.0 105

N/mm2

N = 0.82 105

N/mm2

4.

A column of circular cross section made of cast iron 200mm in diameter and 20mm thick isused as a column 6m long. Both the ends of the column are fixed. The column carries a load

of 250kN at an eccentricity of 25mm from the axis of the column. Find the extreme stress on

the column section. Determine the maximum eccentricity in order there may be no tension

any where on the section.

5. Derive expression for strut pinned at both the ends and subjected to axial thrust P anduniformly distributed load w per unit run.

6. A short column of hollow cylindrical section 25cm outside diameter and 15cm insidediameter carries a vertical load of 400kN along one diameter planes 10cm away from the

axis of the column. Find the extreme intensities and state of their nature.

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Code No: T0122

7. A beam of T section (flange: 100 mm x 20 mm; web: 150 mm x 10mm) is 2.5 meters inlength and is simply supported at the ends. It carries a load of 3.2 kN inclined at 20

0to the

vertical and passing through the centroid of the section. If E= 200 GN/m

3

. Calculatei) Maximum tensile stress

ii) Maximum compressive stress

8. Determine the forces in the members of a pin jointed steel structure in figure by method ofsections.

2 of 2

100kN

3m 3m

4m

75kN

3m 3m

75kN

Wv

1.25m 1.25m

Wu90

0

N

20 mm

150 mm

A B

C D

10 mm

200

100 mm

A

W= 3.0 kN

R07 SET - 1


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Code No: T0122






*******0******

1. A material has proportionality limit of 270 N/mm2 in simple tension under a certain threedimensional stress system. The Principal stresses are 100 N/mm

2.(tensile) and 75

N/mm2(compressive) and 25 N/mm

2(compressive). Calculate factor of safety according to

Maximum Principal strain theory, Maximum shear stress theory and Maximum shear strain

energy theories. Consider Poisson ratio as 0.3.

2. A 1000 H.P has to be transmitted at 100 R.P.M. Find the diameter of solid circular shaft.Find necessary hollow shaft with internal diameter equal to 5/6 of external diameter. What

will be the % savings in the weight of the shaft? Allowable shear stress is 100 N/mm2

and

density of the material is 9g/cm3.

3. An open coiled helical spring is made of 8mm diameter wire has 12 coils and 50mm meandiameter with each coil makes an angle of 25




N/mm2

N = 0.82 105

N/mm2

4. A built up beam shown in figure 1 is simply supported at ends, compute its length given thatwhen it is subjected to a load of 35 kN/m length, it deflects by 10 mm. Find out the safe load

if the beam is used as a column with both ends hinged. Assume factor of safety of 3. Use

Eulers formula. E = 2.0 105

N/mm2

1 of 2

2W

1.2 a 1.2 a

a

Figure 2Figure 1

300mm

600mm

50mm

20mm

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Code No: T0122

5. Derive expression for strut pinned at both the ends and subjected to an axial thrust P andtransverse point load W at the center.

6.

A load of 150 kN is carried by a column made of cast-iron. The external and internaldiameters are 200mm and 180mm respectively. If the eccentricity of the load is 25mm find

a) The maximum and minimum stress intensities

b) Up to what eccentricity there is no tensile stress in column.

7. A beam having an I section 7.5 m in length carrying a uniformly distributed load of 40 kN/mand having the section properties listed below. Calculate maximum bending stresses induced

in the member when the trace of load plane is inclined at 100

to the Principal axis YY.

I XX = 13158 cm4

I YY = 631.9 cm4

Z XX = 751.9 cm3

Z YY =76.6 cm3

h = 350mm b = 165mm

8. Determine the forces in the members of a pin jointed steel structure in figure 2 by method ofsections.

2 of 2

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Code No: T0122






*******0******

1. A material has proportionality limit of 270 N/mm2 in simple tension under a certain threedimensional stress system. The principal stresses are 125 N/mm

2. (Compressive) and 75

N/mm2(compressive) and 50 N/mm

2(compressive). Calculate factor of safety according to

Maximum principal stress theory, Maximum Principal strain Theory and shear stress

theories. Consider Poisson ratio as 0.3.

2. A 50 kW has to be transmitted at 200 R.P.M. Find the necessary diameter of solid circularshaft. Find necessary hollow shaft with internal diameter equal to 3/4 of external diameter.

What will be the % savings in the weight of the shaft? Allowable shear stress is 90 N/mm2

and density is 7g/cm3.

3. An open coiled helical spring is made of 8mm diameter wire has 10 coils and 40mm meandiameter with each coil makes an angle of 25




N/mm2

N = 0.82 105

N/mm2

4. A column of circular cross section made of cast iron 250mm in diameter and 25mm thick isused as a column 5m long. Both the ends of the column are fixed. The column carries a load

of 250kN at an eccentricity of 15mm from the axis of the column. Find the extreme stress on

the column section. Determine the maximum eccentricity in order there may be no tension

anywhere on the section.

5. Derive expression for strut pinned at both the ends and subjected to an axial thrust P andtransverse point load W at the center.

6. A short column of hollow cylindrical section 25cm outside diameter and 15cm insidediameter carries a vertical load of 300kN along one diameter planes 10cm away from the

axis of the column. Find the extreme intensities and state of their nature.

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Code No: T0122

7. A cantilever, of I section, 3.0 meters long is subjected to a load of 250 N at the free end asshown in figure. Determine the resulting bending stresses at corners A and B, on the fixed

section of the cantilever.

8. Determine the forces in the members 1, 2, 3 of a pin jointed steel structure in figure bymethod of sections.

2 of 2

30 mm

250 N

50 mm

45 mm

A B

C D

2 mm

200

1

2

3

150kN

4m 4m

6m

150kN

4m 4m

150kN

3m

150kN 150kN

4m 4m

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Code No: T0122






******0*******

1. Identify principal planes and estimate principal stresses and maximum shear stress on amember subjected to two perpendicular stresses 100 N /mm

2(tensile) and 50 N /mm

2

(compressive). Draw diagram showing the position of principal planes. The member is also

subjected to a shearing stress of 25 N/mm2.

2. A 1000 H.P has to be transmitted at 250 R.P.M. Find the diameter of solid circular shaft.Find necessary hollow shaft with internal diameter equal to 0.85 times external diameter.

What will be the % savings in the weight of the shaft? Allowable shear stress is 90 N/mm2

and density of the material is 7g/cm3.

3. An open coiled helical spring is made of 7.5mm diameter wire has 15 coils and 75mm meandiameter with each coil makes an angle of 30




N/mm2

N = 0.82 105

N/mm2

4. A built up beam 1000mm deep and 20mm thick web and 250mm wide and 25mm thickflanges on either sides is simply supported at ends, compute its length given that when it is

subjected to a load of 50 kN/m length, it deflects by 10 mm. Find out the safe load if the

beam is used as a column with both ends fixed. Assume factor of safety of 3. Use Eulers

formula. E = 2.0 105

N/mm2

5. Derive expression for strut pinned at both the ends and subjected to axial thrust P anduniformly distributed load w per unit run.

6. A load of 150kN is carried by a column made of cast-iron. The external and internaldiameters are 200mm and 175mm respectively. If the eccentricity of the load is 25mm find

a) The maximum and minimum stress intensities

b) Upto what eccentricity there is no tensile stress in column.

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Code No: T0122

7. A 65 mm X 65 mm X 10mm angle section shown in figure is used as a simply supportedbeam over a span of 4.0m. It carries a load of 450 N along the line YG, where G is the

centroid of the section. Calculate

i) Stresses at the points A, B and C of the mid section of the beam,

ii) Deflection of the beam at the mid section and its direction with the load line, Position of

the neutral axis. Take: E = 200 GN/m2.

8. Determine the forces in the members of a pin jointed steel structure in figure by method ofsections.

2 of 2

X

G

U

U

V

V

Y

Y

X

Y1

100kN

3m 3m

4m

100kN

3m 3m

100kN

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Code No: V0322


THERMAL ENGINEERING - I(Com. to ME, AME)



******0******

1. a) What is the difference between air standard cycle approximation, fuel-air cycleapproximation and real cycle performance? (6M)

b) List and discuss various losses occurring in the actual engine operation. Explain the

effect of time losses with the help of a p-v diagram. (10M)

2. a) Explain the need and importance of cooling in an IC engine. (6M)b) Explain thermosyphon system of cooling with neat diagram. (10M)

3. a) what are the different stages in combustion in SI engine and how much Quantity ofheat is released in different stages. (8M)

b) Write a short note on flame propagation. (8M)

4. a) Explain with figure various types of combustion chambers used in CI engines (8M)b) Bring out clearly the process of combustion in CI engines and also explain various

stages of combustion (8M)

5. a) What is the significance of conducting the Morse Test ? Explain in detail. (6M)b) The following observations were recorded during a trial of a four stroke, single

cylinder oil engine. Duration of the test is 45 min; oil consumption is 4 liters; calorific

value of the oil is 43MJ/Kg ; specific gravity of the fuel =0.8: area of the indicator is8.5cm2; length of the indicator diagram =8.5 cm spring constant = 5.5bar/cm ; brake

load=150kg; Spring balance reading =21kg ; effective brake wheel diameter =1.5m

(10M)

6. A trial on a 2-stroke single acting reciprocating air compressor gave the following data.Free air delivered = 6m

3/min at pressure and temperature 1bar and 27

oc

Delivery pressure 40bar

Speed 400r.p.m

Intermediate pressure 6 bar

Temperature at inlet to second stage 27oc

Law of compression pv1.3

const

Mechanical efficiency 80%

Stroke of the compressor L.P = Diameter of the LP=Stroke of HPCalculate i) cylinder diameter ii) power required. Neglect clearance. (16M)

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Code No: V0322

7. The following data pertain to a centrifugal compressorTotal pressure ratio 3.6:1

Diameter of inlet eye of the impeller 95cmAxial velocity at inlet 140 m/sec

Mass flow 12kg/sec

The velocity in delivery duct 120m/sec

Tip speed of impeller n 760m/sec

Speed of impeller 16000 rpm

Total head isentropic efficiency 80%

Pressure coefficient 0.73

Ambient conditions 1.013 bar and 150c

Calculate i) the static pressure and temperature at inlet &outlet of compressor, ii) the

static pressure ratio, iii) work of compressor /kg of air and iv) the theoretical power

required. (16M)

8. a) What do you mean by surging & choking? (6M)b) An axial flow compressor with an overall isentropic efficiency of 85% draws air at

20C and compresses it in the pressure ratio of 4:1. The mean blade speed and flow

velocity are constant throughout the compressor. Assuming 50% reaction balding and

taking blade velocity as 180 m/s. and work input factor as 0.82. Calculate

i) Flow velocity and ii) the number of stages Take = 12, = 42 and Cp = 1.005

KJ/kg K.

(10M)

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Code No: V0322





******0*******

1. a) Why the actual cycle efficiency is much lower than air stand cycle efficiency? (8M)b) Differentiate between the actual and ideal cycles and the factors responsible. (8M)

2. a) Draw a neat sketch of fuel pump for CI engine and Explain. (8M)b) Explain the principle of scavenging and its importance. (8M)

3. a) What are the desirable qualities of si engine fuels to inhibit detonation? (8M)b) Explain the effect of different operating parameters on Flame propagation velocity.

(8M)

4. a) Explain the stages of combustion in CI engine with the help of suitable sketches. (10M)b) Explain M combustion chamber and list its advantages. (6M)

5. A 6 cylinder gasoline engine operates on the 4-stroke cycle. The bore of the each cylinder is80mm and the stroke is 100 mm. The clearance volume per cylinder is 70 cm3. At a speed

of 400 rpm the fuel consumption is 20 kg/h and the torque developed is 150 N-m. Calculate.

i) Brake power, ii) Brake mean effective pressure

iii) Brake thermal efficiency. If the calorific value of the fuel is 43000 KJ/kg

iv) The relative efficiency on a brake power basis, assume the engine works on constant

volume cycle r = 1.4 for air. (16M)

6. a) Determine the expression for the work done of the single stage compressor with perfectinter cooling. (6M)

b) A single stage double acting compressor is required to deliver 14m3of air per min

measured at 1.013bar and 15oc. the delivery pressure is 7 bar. And speed of the compressor

is 300rpm. Take clearance volume as 5%of swept volume with compression and expansion

n=1.3. Calculate

i) Swept volume of a cylinder. ii) Delivery temperature iii) Indicated power. (10M)

7. a) Write the classification of rotary compressors and explain working principle of rootsblower with neat sketch. (10M)



efficiency. (6M)

8. In an eight stage axial flow compressor the overall stagnation pressure ratio achieved is 5:1with an overall isentropic efficiency of 92% .the inlet stagnation pressure &temperature are

1bar and 290k.the work is divided equally between the stages. The mean blade speed is

160m/sec and 50%eaction design issued. The axial velocity throughout the compressor is

constant and is equal to 90m/sec calculate

i) The blade angles ii) the power required (16M)

1 of 1

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Code No: V0322





******0*******

1. a) what are i) Pumping losses ii) rubbing friction losses and iii) exhaust blow down loss.b) Explain how the composition of exhaust gases in a petrol engine varies with respect to

air/fuel ratios (6M+10M)

2. a) what are the parts that required lubrication in an IC engine (6M)b) What are the types of lubricating systems? Explain splash and pressure system with neat

diagram (10M)

3. a) Draw the schematic diagrams of I-type, L-type, F-type combustion chamber and comparethe salient features among them. (8M)

b) Discuss the methods for improving the anti-knock quality of a SI engine fuel. (8M)

4. a) What is meant by ignition delay or ignition lag? it is usually divided into two chambersname and describe them. (8M)

b) With the aid of a neat sketch, explain the squish in C.I engines. (8M)

5. The following observations were data refer to an oil engine working on Otto cycleBrake power=14.7kW

Suction pressure=0.9barMechanical efficiency=80%

Index of compression curve=1.35

Index of expansion curve=1.3

Maximum explosion pressure=24 bar

Engine speed=1000 rpm

Ratio of stroke=1.5

Find diameter and stroke of piston (16M)

6. a) prove that the volumetric efficiency of single stage compressor is given byvol= 1+k-k(p2/p1)

1/n(8M)

b) A multistage air compressor is to be designed to evaluate the pressure from 1 bar to

125bar such that stage pressure ratio will not exceed 4 determinei).no of stages ii) exact pressure ratio iii) intermediate pressure. (8M)

1 of 2

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Code No: V0322

7. a) Derive an expression for efficiency of Roots blower in terms of pressure ratio and ratio ofspecific heats. (6M)

b) A rotary compressor receives air at 1 bar and 170C and delivers it at a pressure of 6 bar.

Determine per kg of air delivered, work done by the compressor and heat exchanged withthe jacket water when the compression is isothermal, isentropic by the relation PV

1.6

=constant. (10M)

8. a) Explain the working principle of axial flow compressor with neat sketch. (10M)b) Write the differences between centrifugal and axial flow compressors (6M)

2 of 2

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Code No: V0322





******0*******

1. a) Explain about heat loss factor. (8M)b) What are the requirements of ignition system in IC engines. (8M)

2. a) Clearly explain wet sump lubrication system with a sketch. (8M)b) Briefly discuss the air fuel ratio requirement of a petrol engine from no load to full load.

(8M)

3. a) what are the different stages in combustion in SI engine and how much quantity of heat isreleased in different stages. (8M)

b) Write a short note on flame propagation. (8M)

4. a) How to achieve air swirl in combustion chamber of S.I engine? (8M)b) How does combustion takes place in C.I. engine. (8M)

5. a) The power of a six cylinder four stroke direct injection oil engine is absorbed by a waterbrake for which, B.P. = WN / 20,000, where W is the brake load in Newton and N is the

speed in R.P.M. The air consumption was measured by an air-box sharp edged orifice

system. The bore is 95 mm, stroke 120 mm, speed 2400 R.P.M, orifice diameter 30 mm,

orifice coefficient of discharge 0.6, C/H ratio by mass in fuel 83/17, brake load 550 N, fuel

density 0.831kg/m3. Calculate BMEP, torque, BSFC and volumetric efficiency. Assume

any missing data suitably. (10M)b) List the various methods for measuring friction power of an engine. (6M)

6. a) Show that the conditions for minimum work of the compressor P2= (P1P3)1/2 (8M)b) an air compressor takes in air at 1bar and 20

oc and compresses it according to the law

pv1.2

=const. it is then delivered to a receiver at a constant pressure of 10 bar. R=0.287

kJ/Kg.k . Determine i) Temperature at the end of the compression ii) Work done and heat

transfer during compression / kg of air. (8M)

7. a) Write the classification of rotary compressors and explain working principle of rootsblower with neat sketch (10M)



efficiency (6M)

8. a) Explain with a neat sketch the working an axial flow compressor. (8M)b) An axial flow compressor with compression ratio as 5 draws air at 20

0C delivers at 50

0C.

Assuming 50% degree of reaction. Find the velocity of flow if the blade velocity is 100 m/s

also find the number of stages, take work factor= 0.85, =100,=40

0,Cp=1KJ/Kg.k (8M)

2 of 2

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Code No: V0423

II B. Tech II Semester, Supplementary Examinations, April - 2012

SWITCHING THEORY AND LOGIC DESIGN

(Electronics and Communications Engineering)Time: 3 hours Max Marks: 80



******0*******

1. a) Find the octal equivalent of (2F.C4)16 and the hex-equivalent of (762.013)8 . (8M)b) What do you understand by the ls and 2s complements of a binary number? What willbe the range of decimal numbers that can be represented using a 16-bit 2s complement

format? (8M)

2. a) What is meant by expanded POS and minimal POS? Obtain expanded POS and minimalPOS expression for the following logic expression BABACBAf +=),,(

b) Simplify using Boolean-algebra

i) CBCBACBABA +++

ii) BACBADACCABA +++++ (8M+8M)

3. Simplify the following expressions using k-map and implement with NOR gate?)15,13,12,10,8,7,6,4,2,0(),,,( MDCBAf =

)14,10()15,11,9,7,6,5,4,1,0(),,,(

+= mDCBAf (16M)

4. a) Design a circuit to convert Excess-3 code to BCD code using 4:16 de-multiplexer.b) Explain the functionality of priority encoder with its logic diagram? (8M+8M)

5. a) Design a BCD to excess3 code converter using PLA logic, Draw its truth table and logicdiagram. (10M)

b) Given a switching function f(x1, x2, x3) = (0,1,3) determine whether or not it is realizable

by a single threshold element, and if it is, find appropriate weights and threshold. (6M)

6. a) What is the Q output logic status of following input conditions of the J-K flip-flop hivingactive HIGH J and K inputs and active LOW PRESET and CLEAR inputs,?

i) J = 1, K = 0,PRESET=1,CLEAR = 1;ii) J = 1, K = 1,PRESET=0,CLEAR = 1;

iii) J = 0, K = 1,PRESET=1,CLEAR = 0;iv) J = K = 0, PRESET = 0, CLEAR = 1.

b) Draw the logic diagram of a 4 bit binary ripple counter using negative edge triggering.

(8M+8M)

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Code No: V0423

7. a) State the capabilities and limitations of finite state machine? (6M)b) Find the Equivalence partition for the given Machine. Show a standard form of the

corresponding reduced machine. (10M)

PS NS, Z

X=0 X=1

A B,1 H,1

B F, 1 D,1

C D,0 E,1

D C,1 F,1

E D,1 C,1

F C,1 C,1

G C,1 D,1

H C,0 A,1

8. Design the ASM chart, Data path circuit & Control circuit to implement traditional divisionof two four bit binary numbers. (16M)

2 of 2

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Code No: V0423






*******0******

1. a) Do the following conversions:i) Eight-bit 2s complement representation of (23) 10;

ii) Decimal equivalent of (00010111)2 represented in 2s complement form. (8M)b) Write:

i) Hamming (7,4) code for 0000 using even parity

ii) Hamming (11,7) code for 1111111 using odd parity. (8M)

2. a) What is meant by expanded SOP and minimal SOP? Obtain expanded SOP and minimalSOP expression for the following logic expression. )(),,( CBACBAf += (8M)

b) Simplify using Boolean-algebra

i) )()( DBBCBAAB ++++

ii) EDCBDCBDCB ++++ )( (8M)

3. Obtain the minimal expression using the tabulation method?)4,2()14,13,12,6,5,1(),,,( dmDCBAf += (16M)

4. a) Discuss how does a priority encoder differ from a conventional encoder explain with thehelp of a truth table and logic diagram? (6M)b) Design a circuit to convert Excess-3 code to BCD code using 4:16 de-multiplexer.

(10M)

5. a) Discuss the advantages of PLDs in comparison with fixed logic device? (6M)b) Design a BCD to excess3 code converter using PLA logic, Draw its truth table and logic

diagram. (10M)

6. a) Draw the logic diagram of a JK flip-flop and using excitation table, explain its operation.b) Draw the block diagram of a 4-bit serial adder and explain its operation. (8M+8M)

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Code No: V0423

7. a) Explain the procedure to minimize completely specified sequential machine? (6M)b) Find the Equivalence partition for the given Machine. Show a standard form of the


PS NS, Z

X=0 X=1

A B,1 H,1

B F, 1 D,1

C D,0 E,1

D C,1 F,1

E D,1 C,1

F C,1 C,1

G C,1 D,1H C,0 A,1

8. a) Explain the control subsystem implementation of weighting machine? (8M)b) Draw the state diagram of a Mod-6 counter and convert it into the ASM chart. Explain the

sequence of operation in each ASM block. (8M)

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1. a) Add 118 and 32 firstly using eight-bit 2s complement arithmetic and then using16-bit2s complement arithmetic. Comment on the results. (8M)

b) Write:i) Hamming (7,4) code for 0000 using even parity

ii) Hamming (11,7) code for 1111111 using odd parity. (8M)

2. a) Discuss different types minimal and expanded forms of Boolean expressions? Illustratewith examples. (8M)b) Simplify using Boolean-algebra.

i) )()( DBBCBAAB ++++

ii) EDCBDCBDCB ++++ ( (8M)

3. Obtain the minimal expression using the tabulation method?)4,2()14,13,12,6,5,1(),,,( dmDCBAf += (16M)

4. a) Implement a full subtractor combinational circuit using a 3-to-8 decoder and externalNOR gates. (8M)b) Design a 32-to-1 multiplexer using 8-to-1 multiplexers having an active LOW ENABLE

input and a 2-to-4 decoder? (8M)

5. a) What is meant by programming in PLDs. Give the hardware procedure of programmingin PROMs and EPROMs. (8M)

b) Show the logic arrangement of both a PROM and a PLA required to implement a binaryfull adder. (8M)

6. a) What is the Q output logic status of following input conditions of the J-K flip-flop hivingactive HIGH J and K inputs and active LOW PRESET and CLEAR inputs,?

i) J = 1, K = 0, PRESET=1, CLEAR = 1;ii) J = 1, K = 1, PRESET=0, CLEAR = 1;

iii) J = 0, K = 1, PRESET=1, CLEAR = 0;iv) J = K = 0, PRESET = 0, CLEAR = 1. (8M)

b) Design Modulo-6 counter using T flip-flops. (8M)

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7. a) Distinguish between Mealy and Moore machines (6M)b) Find the Equivalence partition for the given Machine. Show a standard form of the


PS NS, Z

X=0 X=1

A B,1 H,1

B F, 1 D,1

C D,0 E,1

D C,1 F,1

E D,1 C,1

F C,1 C,1

G C,1 D,1

H C,0 A,1

8. The state diagram of a control is shown in the following figure 1.i) Determine the equivalent ASM chartii) Design the control unit using D flip-flops and decoder (16M)

Figure 1

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1. a)Subtract using 2s complement arithmetic.i) (64)10 from (+32)10ii) (29.A) 16 from (4F.B) 16. (8M)

b) Give the difference between the cyclic and non cyclic codes explain with the help of

example? (8M)

2. a) Discuss different types minimal and expanded forms of Boolean expressions? Illustratewith examples. (8M)

b) Obtain expanded POS , minimal POS expression and expanded SOP, minimal SOPexpression for the following logic expressions.

i) BABACBAf +=),,(

ii) )(),,( CBACBAf += (8M)

3. Simplify the following expressions using k-map and implement with NOR gate?)15,13,12,10,8,7,6,4,2,0(),,,( MDCBAf =

)14,10()15,11,9,7,6,5,4,1,0(),,,( +=

mDCBAf (16M)

4. a) What is a de-multiplexer and how does it differ from a decoder? How can a decoder beused as a de-multiplexer? (8M)

b) Implement a full adder combinational circuit using a 3-to-8 decoder and external NOR

gates. (8M)

5. a) What is meant by programming in PLDs. Give the hardware procedure of programmingin PROMs and EPROMs. (8M)b) A and B are two binary variables. The objective is to design a magnitude comparator to

produce A = B, AB outputs. Design a suitable PLD with a PAL (8M)

6. a) What is a clocked J-K flip-flop? Explain with the help of truth tables what improvementdoes it have over a clocked R-S flip-flop? (8M)

b) Design a sequence detector which detects 110101? Implement the sequence detector by

using D-type flip-flop? (8M)

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7. a) How the incompletely specified state machine is simplified? (8M)b) Find the Equivalence partition for the given Machine. Show a standard form of the


PS NS, Z

X=0 X=1

A D,0 H,1

B F, 1 C,1

C D,0 F,1

D C,0 E,1

E C,1 D,1

F D,1 D,1

8. The state diagram of a control is shown in the following Figure 1.i) Determine the equivalent ASM chartii) Design the control unit using multiplexers (16M)

Figure 1

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DATA BASE MANAGEMENT SYSTEMS(Com to CSE, IT)



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1. a) What are the major disadvantages of file-processing system?b) Explain with examples various levels of data abstraction.

2. a) Does the relational model, as seen by an SQL query writer, provide physical and logicalindependence? Explain.

b) Illustrate with an example translation of relationship sets with participation constraints of

an ER diagram to relational model.

3. Consider the following relational schema Employee(employee-name, street, city)Works(employee-name, company-name, salary) Company(Company-name, city)

Manages(employee-name, manager-name)

Give an expression in SQL for the following queries

a) Find all employees who earn more than the average salary of all employees of their

company

b) Find the company that has the most employees

c) Find the company that has the smallest payroll

4. When do you say a relation is in 3NF? How do you decompose a relation such that resultingschemas are in 3NF?

5. Explain with examples SQL constraints for complex integrity constraints.6. a) What is meant by crashing? Describe the importance of crash recovery. Also write the

failure classification.

b) Describe the following in brief:

i) Shadow-paging

ii) Log-based recovery

7. a) Static storage cant be implemented, Explain why it cant be?b) Stable storage cant be implemented, explain how database systems deal with this

problem.

8. Explain Heap file with un clustered has index?1 of 1

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1. a) Distinguish between file-processing system and database management system.b) What do you mean by data- abstraction and dataindependence?

2. Illustrate with an example how to generate a relational-database schema from an ERschema

3. Consider the following relational schema Employee(employee-name, street, city)Works(employee-name, company-name, salary) Company(Company-name, city)

Manages(employee-name, manager-name)

Give an expression in SQL for the following queries

a) Find all employees in the database who live in the same cities as the companies for which

they work.

b) Find all employees in the database who live in the same cities and on the same streets as

do their managers.

4. a) What are the problems caused by redundancy?b) What do you mean by functional dependencies? Explain with an example.

5. What do you mean by loss-less join decomposition and dependency-preservingdecomposition? Illustrate with examples.

6. a) What is trigger? What are its uses? What are the differences between triggers andconstraints?

b) Discuss the difference between Logical and physical data independence?

7. Explain about Fixed-length file organization with an example.8. Explain all the operations on B+ - tree by taking a sample example

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1. What do you mean by data model? Explain in detail various data models.2. a) Illustrate with an example how ER diagrams with aggregation can be translated to

relational model.

b) Illustrate with an example need to restrict view updates.

3.

Illustrate with examples all set-comparison operators.

4. a) List all the nontrivial multi-valued dependencies satisfied by the following relation.A B C

a1 b1 c1

a1 b1 c2

a2 b1 c1

a2 b1 c3

b) Suppose that we decompose the schema R=(A,B,C,D,E) into (A,B,C) and (A,D,E). Showthat this decomposition is a loss-less join decomposition if the following set F of functional

dependencies hold

ABC

CDE

BD

EA

5. a) What do you mean by trigger? Explain with an example how triggers are written in SQLb) Explain with an example how a new domain can be created in SQL

6. a) Compare deferred immediate database Modification?b) Explain check points.

7. What is meant by concurrency? Describe the concept of lock based control8. Explain composite search keys with examples?

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1. a) Explain about data-definition language and data manipulation languages.b) What do you mean by data independence? Explain various levels of data independence.

2. Let R=(A,B), and S=(A,C), and let r(R) and s(S) be relations. Write relational-algebraexpressions equivalent to the following domain relational-calculus expressions.

3.

Explain with examples how constraints over a single table and constraints over severaltables can be enforced in SQL.

4. Suppose you are given a relation R with four attributes, ABCD. For the following sets offunctional dependencies, assuming those are the only dependencies that hold for R, do the

following

i) Identify the candidate key(s) for R

ii) Identify the best normal form that R satisfies (1NF,2NF,3NF, or BCNF),

iii) If R is not in BCNF, decompose it into a set of BCNF relations that preserve the

dependencies.

a) CD, CA, BC

b) BC, DA

5. Let R=(A,B,C) and let r1 and r2 both be relations on schema R. Give an expression in theSQL that is equivalent to each of the following

i) a(r1)

ii) B=17(r1)

iii) r1 r2

iv) r1r2

6.

How recovery is possible with loss of Non-volatile storage?

7. Explain clustered index organization with examples?8. Describe the importance of file organization. Explain the advantages and limitations of

sequential files.

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LINEAR AND DIGITAL IC APPLICATIONS(Electrical and Electronics Engineering)



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1. a) List the advantages of integrated circuit over discrete component circuit? (4M)b) What is a practical op-amp? Draw its equivalent circuit? (6M)

c) Explain the operational amplifier internal circuit? (6M)

2. a) What is an instrumentation amplifier? Draw a system whose gain is controlled byan adjustable resistance? (8M)

b) Find R1 and Rf in the lossy integrator so that the peak gain is 25 dB and gain is 2 dB

down from its peak when w = 25,000 rad/s. Use a capacitance of 0.1F? (8M)

3. a) Design a fourth order Butterworth low-pass filter having upper cut-off frequency 1 kHz?b) What is the roll-off rate of first order filter? (10M+6M)

4. a) Draw the circuit diagram of Schmitt trigger using 555 timer and explain its operation?b) Explain the operation of IC 566 VCO with neat block diagram? (8M+8M)

5. a) Explain important specifications of D/A and A/D converters? (6M)b) A 5-bit D/A converter is available. Assume that 0000 corresponds to an output of +10V

and that the D/A converter is connected for -0.1V per increment, what output voltage will be

produced foe1111? (10M)

6. a) Explain the characteristics of digital logic families? (6M)b) Draw the circuit diagram of 4-input NAND gate by using CMOS technology and explain

its operation? (10M)

7. a) Design a circuit that will convert gray code into binary code? (8M)b) Design a 32*1 MUX using 8*1 MUXs, and one 4*1 MUX? (8M)

8. a) Find the number of flip-flops required to generate the sequence 1101011 and design thecircuit using JK flip-flops? (10M)

b) Distinguish between Synchronous and asynchronous counters? (6M)

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1. Define the following terms?a) Input offset current b) Thermal Drift c) SVRR d) Slew rate

(4M+4M+4M+4M)

2. a) Design an op-amp differentiator that will differentiate an input signal with fmax =100 Hz.b) Draw the circuit of voltage to current converter and explain its operation for floating loadand grounded load cases? (6M+10M)

3. a) Draw and explain the operation of triangular wave generator?b) Explain the working of Wien Bridge oscillator by using op-amp? (8M+8M)

4. a) Explain the operation of missing pulse detector by using 555 timer?b) Explain the basic blocks of phase locked loop? (8M+8M)

5. a) Why is an inverted R-2R ladder network DAC better than R-2R ladder DAC?b) A dual slope ADC uses a 18-bit counter with a 5 MHz clock. The maximum voltage is

+12 V and the maximum integrator output voltage at 2N

count is -10 V. If R = 100 K, find

the size of the capacitor to be used for integrator? (8M+8M)

6. a) What is transmission gate? Explain its operation?b) With neat circuit diagram explain the working of two-input TTL NAND gate with totem-

pole output? (8M+8M)

7. a) How does a priority encoder differ from an ordinary encoder?b) Implement the full-adder circuit using a decoder and OR gates? (8M+8M)

8. a) Design a MOD-12 counter using D flip-flop?b) What is race around condition? How it is avoided? (10M+6M)

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1. a) List the characteristics of ideal op-amp?b) Explain the DC characteristics of op-amp? (6M+10M)

2. a) How an op-amp can acts as integrator and derive necessary equations?b) Design a multiplier by using operational amplifier? (8M+8M)

3. a) Draw the circuit diagram of practical notch filter? Explain its operation?b) Design a monostable multivibrator with trigger pulse shaping which will drive a LED ON

for 0.5 second each time it is pulsed? (8M+8M)

4. a) Discuss the operation of a FSK generator using 555 timer?b) Derive the expression for Lock-in range? (8M+8M)

5. Define the following terms.i) Resolution ii) Linearity iii) monotonicity iv) settling time (4M+4M+4M+4M)

6. a) With neat circuit diagram explain the operation of Tri-state TTL inverter?b) Explain the NOR gate operation by using dynamic MOS technology? (8M+8M)

7. a) Design a combinational circuit that convert BCD code to seven segment code generator?b) Draw the logic diagram for 2-bit comparator and explain? (8M+8M)

8. a) Distinguish between static RAM and dynamic RAM?b) Draw and explain the operation of the 4-bit parallel-in-parallel-out shift register?

(8M+8M)

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1. a) Differential amplifier uses a transistor with = 200 and is biased at ICQ = 100A.Determine the value of RC and RE ifADM =500 and CMRR = 80dB?

b) Briefly explain about AC characteristics of op-amp? (8M+8M)

2. a) With the help of neat circuit diagram explain the operation of sample and hold circuit?b) Draw the functional block diagram and pin diagram for IC 723 regulator? (8M+8M)

3. a) Design all pass filter and derive necessary equations?b) Determine the order of low-pass Butterworth filter that is provide 40dB attenuation at

w/wh = 2. (8M+8M)

4. a) How is an astable multivibrator used as a pulse position modulator?b) List the applications of PLL? (10M+6M)

5. a) Explain the operation of servo tracking A/D converter?b) Explain the working of successive approximation converter? (8M+8M)

6. a) Distinguish logic families with various parameters?b) With neat circuit diagram explain the working of two-input TTL NAND gate with open

collector-pole output? (8M+8M)

7. a) Design a full adder using 8*1 MUX and explain?b) Implement the circuit for 2s complement adder-subtractor? (8M+8M)

8. a) Draw and explain the circuit diagram of bidirectional shift register?b) Explain the architecture of SRAM with neat diagrams? (8M+8M)

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