hall ticket no: question paper code: a1015 (autonomous) …b) explain in detail about object naming...

Hall Ticket No: Question Paper Code: A1015

(AUTONOMOUS) B. Tech VIII Semester Regular Examinations, April - 2017

(Regulations: VCE-R11A)

INDUSTRIAL MANAGEMENT AND PSYCHOLOGY

(Common to Computer Science and Engineering & Information Technology)

Date: 28 April, 2017 AN Time: 3 hours Max Marks: 75

Answer ONE question from each Unit All Questions Carry Equal Marks

Unit – I

1. a) How does scientific management thought of F.W.Taylor transformed the approach of Managers?

5M

b) What are the salient features of systems approach to management? Explain Maslow’s hierarchy of needs theory and relate it to daily life.

10M

2. a) What are the limitations of military type organization when compared to functional organization?

8M

b) What are the principles of organization propounded by Henry Fayol?

7M

Unit – II

3. a) What are the factors that affect selection of a Plant Location? 8M b) Discuss varieties of Production systems observed in industry. 7M 4. a) How ‘Standard Time’ is established? Mention and explain the utility of any two types of

charts used in method study. 9M

b) Mention the steps in Work Study. Explain.

6M

Unit – III

5. a) With examples, differentiate between PERT and CPM. 5M b) Draw the network for the following project:

ACTIVITY PRECENDENCE DURATION

A - 12

B A 6

C A 8

D B, C 10

E A 3

F D, E 8

G C 4

H F, G 1

I H 5

Identify the critical path and determine the project duration. Also calculate: i. Early Start Time (EST) ii. Early Finish Time (EFT) iii. Late Start Time (LST) iv. Late Finish Time (LFT) v. Total Float (TF) vi. Independent Float (IF) vii. Free Float (FF)

10M

6. a) Why project management is so important in today’s world? Explain the processes involved in it briefly.

8M

b) Describe programme evaluation review techniques. State its advantages and applications.

7M

Cont…2

:: 2 ::

Unit – IV

7. a) What is Stores Management? What are its functions? And explain the role of Purchase Manager.

11M

b) What are objectives of wage incentive schemes?

4M

8. a) What are the major functional areas in HRM? Explain briefly. 5M b) Differentiate between Marketing and Selling. Give an example of Marketing Mix and

explain its significance.

10M

Unit – V

9. a) With illustrations analyze theory X-type and theory Y-type assumptions made for managers.

8M

b) Why the conclusions derived from the Hawthorne experiment is significant in the present day work environment?

7M

10. a) Examine the scope of industrial psychology. Mention its four applications. 8M b) Assess the process of group dynamics with respect to motivation and objectives. 7M


(AUTONOMOUS) B. Tech VIII Semester Regular Examinations, April/May - 2017


GRID AND CLOUD COMPUTING (Computer Science and Engineering)

Date: 01 May, 2017 AN Time: 3 hours Max Marks: 75


Unit – I

1. a) Provide the classification of parallel and distributed computing systems based on their functionality and application.

12M

b) Explain the DVFS method for energy efficiency. 3M 2. a) Discuss in detail software environments for distributed systems and clouds. 7M b) Give the various Peer-to-Peer network families.

8M

Unit – II

3. a) Explain data-center networking structure and give the diagram for standard data-center networking for the cloud to access the internet.

8M

b) Briefly explain the different types of service models available on cloud. 7M 4. a) With a neat diagram explain Google App Engine for PaaS applications. 7M b) Explain any four open challenges in cloud architecture development.

8M

Unit – III

5. a) With a neat diagram of Three-tier system architecture explain Enterprise Multitier Architecture.

7M

b) What is Web Service? Briefly define SOAP, WSDL and UDDI. 8M 6. a) With a neat diagram of Oracle publish-subscribe model explain publish-subscribe model. 6M b) With a neat diagram explain semantic grid architecture.

9M

Unit – IV

7. a) How is Google file system built? 7M b) List the broad capabilities needed by commercial clouds. 8M 8. a) What are the system issues for running a typical parallel program in either a parallel or a

distributed manner? 7M

b) Give the formal definition of MapReduce and its logical data flow.

8M

Unit – V

9. a) Give the Globus Toolkit Architecture in detail. 8M b) What are CPU scavenging and Virtual Computers? 7M 10. a) How the OSGA security model is implemented at various protection levels? 7M b) Give the three authorization models used in authorization for access control. 8M




DISTRIBUTED DATABASES

(Computer Science and Engineering)



Unit – I

1. a) What is a distributed database system? Discuss motivation of the distributed database. 7M b) With an example explain all types of fragmentation. Why fragmentation is required in the

distributed database design?

8M

2. a) What is a fragment of a relation? With a diagram explain reference architecture of the distributed database.

7M

b) Illustrate with an example simplification of joins between horizontally fragmented relations.

8M

Unit – II

3. a) Discuss problems and objectives of the query optimization. 7M b) Discuss communication failure in the DDS and recovery of the distributed transaction.

8M

4. a) What is the importance of serializability and concurrency control in the distributed database?

7M

b) Discuss a distributed deadlock detection algorithm.

8M

Unit – III

5. a) Analyze steps to resolve problems to design a reliable distributed database system. 7M b) Explain in detail about object naming and catalog management with site autonomy.

8M

6. a) Illustrate how detection of inconsistencies in the distributed databases. 7M b) Suggest some solutions for the authorization and protection in the distributed databases.

8M

Unit – IV

7. a) Name architecture issues to develop distributed system and explain page server architecture with a neat diagram.

7M

b) List and explain five important requirement storage managements in the object DBMSs.

8M

8. a) Classify all cache consistency algorithms. Explain them. 7M b) Discuss query processing issues in the object DBMSs.

8M

Unit – V

9. a) With a diagram explain database integration process. 7M b) Discuss two important characteristics addressing interoperability in the object DBMSs.

8M

10. a) Discuss query processing steps in the multi database systems with a diagram. 7M b) With an example discuss distributed multi-DBMS transaction management. 8M


(AUTONOMOUS) B. Tech VIII Semester Regular/Supplementary Examinations, April/May - 2017

(Regulations: VCE-R11/R11A)

INFORMATION RETRIEVAL SYSTEM (Computer Science and Engineering)



Unit – I

1. a) Define Information Retrieval System. Explain the objectives of Information Retrieval System.

8M

b) Clearly discuss the relevance of information retrieval system in the context of Digital Libraries and Data Warehouses.

7M

2. a) Discuss various information retrieval system capabilities in detail. 7M b) How the Information Retrieval System is related to Database Management System?

8M

Unit – II

3. a) What is Indexing? Explain its objectives and write about indexing process. 7M b) Describe how the PAT data structure is different from N-gram data structure.

8M

4. a) Explain the concept of Information Extraction. 7M b) What is statistical indexing? What are the disadvantages of them?

8M

Unit – III

5. a) Discuss about Selective dissemination information search techniques with examples. 8M b) Compare and Contrast Term clustering and Item clustering.

7M

6. a) What is Relevance Feedback? With an example describe in detail about relevance feedback and its impact and effect of relevance feedback.

8M

b) Explain the need for Information Visualization and also describe Tree-Map Visualization technique.

7M

Unit – IV

7. a) What algorithmic basis is used for GESCAN and Fast Data Finder hardware text search machines?

7M

b) Explain Boyer-Moore text search algorithm with an example.

8M

8. a) List out the reasons to evaluate the effectiveness of an Information Retrieval System 7M b) With block diagram, illustrate hardware text search unit.

8M

Unit – V

9. a) Discuss about the importance of Online Public Access Catalog (OPAC). 6M b) Explain briefly about Models and Languages used in multimedia information retrieval.

9M

10. a) Explain indexing and searching in multimedia information retrieval. 7M b) Write the differences between MULTOS query language and SQL3 query language with an

example. 8M




SOFTWARE ARCHITECTURE

(Common to Computer Science and Engineering & Information Technology)



Unit – I

1. a) What is a Software Architecture? What are the goals of Software Architecture? Why Is Software Architecture Important? Discuss Design versus Architecture.

8M

b) With a neat diagram explain the Layered Systems and their properties.

7M

2. a) Draw and explain the Architecture Business Cycle. 8M b) With a neat diagram explain the Data Abstraction, Object-Oriented Organization and

their properties.

7M

Unit – II

3. a) With neat diagrams wherever applicable explain transition from batch sequential to repository.

10M

b) Explain the architectural design guidance for architectural design.

5M

4. a) Discuss about Variants on Data Flow Systems. Show the diagram to compare batch sequential and pipe or filter architectures.

10M

b) Explain Design Space Analysis.

5M

Unit – III

5. a) With a neat diagram explain the problem, solution, liabilities and advantages of ‘Model-View-Controller Pattern’. Give an example for this pattern.

10M

b) Explain the formalizing an architectural design space.

5M

6. a) With a neat diagram explain the problem, solution, liabilities and advantages of ‘Blackboard Pattern’. Give an example for this pattern.

10M

b) Explain the value of architecture formalisms.

5M

Unit – IV

7. a) Discuss the various requirements of architectural description languages. 9M b) Explain the notation linguistic issues in software architectural design.

6M

8. a) Give the types of roles and the players supported for the following inbuilt connectors in unicon: i. Pipe ii. FileIO iii. ProcedureCall iv. DataAccess v. PLBundler vi. RemoteProcCall

10M

b) What is an ADL?

5M

Unit – V

9. a) Describe quality attributes. 9M b) State various business goals in achieving business qualities.

6M

10. a) Explain the following availability tactics: i. Fault Detection ii. Fault Recovery

8M

b) Describe documenting software architecture. 7M




SERVICE ORIENTED ARCHITECTURE (Information Technology)



Unit – I

1. a) Highlight some of the key aspects of service-orientation Architecture principles. 8M b) Briefly explain different sections in the basic structure of a SOAP message, with the help

of diagram.

7M

2. a) Justify the statement “SOA simplifies distributed computing”. 7M b) Illustrate different types of intermediary service transitions through service provider and

service requestor while processing a message.

8M

Unit – II

3. a) Explain Request-Response primitive Message Exchange Patterns and Fire-and-forget primitive Message Exchange Patterns.

8M

b) Explain different parts in endpoint reference of addressing web services.

7M

4. a) Illustrate Orchestration relating to other parts of Service Oriented Architecture environment.

8M

b) Briefly discuss different techniques of achieving message reliability in WS-Reliable Messaging.

7M

Unit – III

5. a) Enumerate service reusability and its relationship with other service-orientation principles.

5M

b) Explain different scenarios for configuring service layers in Service Oriented Architecture.

10M

6. a) Briefly discuss the common set of principles most associated with service-orientation. 8M b) Explain the external influences that form and support contemporary service oriented

architecture.

7M

Unit – IV

7. a) Briefly explain the three fundamental building blocks of the enterprise business model. 8M b) Write the functionality of abstract orchestration logic phase in service Oriented analysis

process and list the potential types of logic suitable for this layer.

7M

8. a) Briefly discuss pros and cons of top-down approach of building Service Oriented Architecture.

7M

b) Enumerate how a service represents a step within a process, a sub-process part of a larger process, or even an entire process.

8M

Unit – V

9. a) Briefly discuss different reply element attributes in WS-BPEL language. 7M b) Illustrate the WS-Addressing relationship with the other WS-* specifications.

8M

10. a) What are the steps for composing Service Oriented Architecture? 7M b) Explain the common layers required by a development and runtime platform for building

Service Oriented Architecture. 8M




SATELLITE AND RADAR COMMUNICATIONS (Electronics and Communication Engineering)



Unit – I

1. a) With a neat sketch explain the six orbital elements to define a satellite orbit. 8M b) Explain the types of non Geo stationary satellite orbits and their uses for communication

with examples. 7M

2. a) Define satellite attitude and briefly describe spin stabilization and momentum wheel stabilization.

8M

b) Define reliability of a system and justify with an expression for reliability in terms of mean time between failures.

7M

Unit – II

3. a) From the basics of transmission theory derive the satellite link formula. Express the formula in decibels.

9M

b) Given that the satellite transmitted power is 20W, satellite antenna gain is 20dB, distance is 40,000km ground antenna gain is 50dB, frequency is 4000MHz, bandwidth is 27MHz and system noise temp is 75k. Calculate the power received.

6M

4. a) Explain the basic principle of transmission and reception of code division multiple access in satellite communication.

7M

b) Explain the frame structure of TDMA traffic burst.

8M

Unit – III

5. a) Explain the types of antennas used for satellite communication. 7M b) Define antenna gain, efficiency, directivity and beam width for satellite antennas. 8M 6. a) Derive the radar range equation with the necessary assumption, diagrams and

equations. 8M

b) List the radar frequencies and applications. Calculate the maximum range of a radar system which operates at 3cm with a peak pulse power of 600KW if its minimum receivable power is 10-13W, capture area of its antenna is 5sq.m and radar cross sectional area of the target is 20sq.m.

7M

Unit – IV

7. a) How do you determine the sign of the Doppler frequency and hence the direction of target motion? Derive the necessary equations and also explain with a block diagram.

10M

b) A continuous wave RADAR operates at a frequency of 10GHz. What is the Doppler frequency produced: i. By an airplane flying at a speed of 250KMPH ii. By a man crawling at a rate of 2.5cm/sec

5M

8. a) With the help of a CW RADAR block diagram, explain the working of the same. 7M b) Compute the duty cycle of RADAR, operating at a PRF of 200Hz, generating pulses of

width 5µsec.Also compute the average power transmitted if peak power is 10kw. 8M

Cont…2

:: 2 ::

Unit – V

9. a) Explain the basic principle of operation of MTI radar with neat diagrams. 10M b) The MTI radar is used by a traffic control police to measure the speed of cars. If the

Doppler frequency shift measured from the moving car is 1.6KHz, calculate the speed of the car. The operating frequency of the above MTI radar is 150MHz.

5M

10. a) Explain the principle of tracking with radars. 5M b) With suitable diagram, explain the working principle of 2-angle coordinate amplitude

comparison mono pulse tracking radar. 10M




WIRELESS COMMUNICATIONS AND NETWORKS (Electronics and Communication Engineering)



Unit – I

1. a) Explain the features and functionality of the Paging systems with a neat figure. 7M b) Illustrate the evolution of the Mobile Radio Communication. 8M 2. a) Illustrate the evolution for 2.5G TDMA standards and their improvements with the help

of a neat figure showing the various upgrade paths for 2G technologies. 8M

b) Illustrate the features of Bluetooth and explain how Bluetooth helps in implementing the Personal Area Networks with an example and a figure.

7M

Unit – II

3. a) Illustrate the TDMA frame structure and its various fields with a neat figure. 7M b) Examine the concept of Spread Spectrum Multiple Access. Illustrate the FHMA in detail. 8M 4. a) Illustrate the features and functionality of PSTN with a neat figure of local Landline

Telephone Network. Also differentiate between wireless and fixed Telephone Networks. 7M

b) Explain the features, characteristics and blocks of Cellular Digital Packet Data (CDPD) with a neat figure.

8M

Unit – III

5. a) Sketch a neat figure of Mobile IP scenario for an example network and illustrate the operations, different entities and terminologies within it to understand the Mobile IP.

8M

b) List and discuss the various requirements for Wireless LANs. 7M 6. a) Illustrate the specifications and architecture of WAP with a neat figure showing its

protocol stack. 7M

b) Tabulate and summarize the key characteristics of the three Wireless LAN technologies.

8M

Unit – IV

7. a) Illustrate the operation phases and ingredients of IEEE 802.11 with relevant figure. 7M b) List and explain the various Bluetooth usage models and their features with relevant

figures for the same. 8M

8. a) Illustrate the features, characteristics, services and operation of LLC. 8M b) Examine the features and functionalities of the IEEE 802.15 protocol architecture with a

neat figure.

7M

Unit – V

9. a) Illustrate how the mobility management and Handoff procedure are implemented in CDPD with relevant figures.

8M

b) List and explain the various requirements and architecture of ad-hoc network in HIPERLAN-1 with relevant figure.

7M

10. a) What is an SMS? Describe its services, operation and protocol architecture with a neat figure.

7M

b) Explain the architecture, reference model and protocol stack of HIPERLAN-2 with relevant figures.

8M




LOW POWER VLSI DESIGN

(Electronics and Communication Engineering)



Unit – I

1. a) What is Gate Induced Drain Leakage(GIDL)? What are its effects in low power design? 8M b) With neat diagram Explain the MIS Structure and its energy bands when it is unbiased.

7M

2. a) What are the various reasons why leakage power exists in CMOS circuits? Give the expressions for various leakage currents.

8M

b) Explain short-circuit power in CMOS inverter. Mention its general expression and all the terms in the equation. How to minimize this power.

7M

Unit – II

3. a) Explain the power dissipation in an N – type domino AND gate with N-type domino gate loads.

7M

b) Given 1 2 1 3Y X X X X , where 1, 2, 3iX … are mutually independent. If

1 2 ,Z X X Y then ( )P Z can be determined as follows. Determine (Y)P without

suppressing the exponents 1 2 1 3 1 2 1 3( ) P(X ) ( ) P(X ) ( )P Y X P X X X P X X .

8M

4. a) Describe the technique of estimating average power in sequential circuits. 8M b) Express 2 0 2 0( ), ( )T T T TP X X X P X X X and 2 0( )TP X X in terms of its probabilities

(P )XP and normalized activities ( )Xa a .

7M

Unit –III

5. a) Explain the architecture driven voltage scaling in behavioral transformation. 8M b) Discuss the pre computation based optimization using pre computation architecture for

low power circuits.

7M

6. a) Describe the first order difference algorithm level transform for low power in behavioral transformation.

8M

b) Explain the role of transistor sizing in power dissipation minimization for circuit level optimization in low power design.

7M

Unit – IV

7. a) With a neat circuit diagram, explain the operation of 3 input domino AND gate. 8M b) Explain the following:

i. P-N reverse bias current ii. Weak Inversion

7M

8. a) With a neat Block diagram, explain the operation of DCVS voltage level converter. 8M b) Explain the following:

i. Steeper subthreshold swing ii. Multiple Threshold voltage

7M

Cont…2

:: 2 ::

Unit – V

9. a) Discuss the operation of an ADL CMOS inverter. Also sketch the circuit of two input ADL NAND gate.

8M

b) Describe the different sources of software power dissipation.

7M

10. a) Explain the following: i. Gate level Power Estimation ii. Software Power optimization

8M

b) Discuss the following for software power estimation: i. Architectural level power dissipation ii. Bus switching activity

7M




SPEECH SIGNAL PROCESSING (Electronics and Communication Engineering)



Unit – I

1. a) With the help of schematic diagram, describe the mechanism of speech Production. 8M b) What are the nasals? How they are produced? Specify the reasons for broadening of nasal

resonances. 7M

2. a) Derive the relationship between pressure and volume velocity at any point in the uniform tube

8M

b) Analyze the complete model of the uniform tube with boundary condition effects.

7M

Unit – II

3. a) Illustrate the complete discrete time speech model and derive the transfer function

(z).H

8M

b) Write short notes on all pole modelling of deterministic signals. 7M 4. a) Deduce the auto correlation method of estimating correlation coefficients for stochastic

speech sounds. 7M

b) Show that 2 21| ( ) |

2A E d

, where ( ) ( ) ( )E A S is the Fourier transform of

the prediction error sequence.

8M

Unit – III

5. a) Enumerate the characteristics of linear prediction analysis in frequency domain. 8M b) Briefly explain the design considerations of varies parameters for synthesizer. 7M 6. a) With the neat sketch, describe the decomposition of the glottal flow derivative waveform. 8M b) Illustrate the use of linearization to voiced speech signals.

7M

Unit – IV

7. a) What are the advantages of homomorphic filtering? Draw the block diagram of homomorphic system for convolution.

8M

b) Explain the use of cepstrum in the context of speech signal processing. 7M 8. a) Discuss the complex cepstrum of speech like sequences with rational z-transforms. 8M b) Discuss about the spectral root homomorphic filtering.

7M

Unit – V

9. a) Illustrate the complex cepstrum of unvoiced speech. 7M b) Explain what is meant by Homomorphic Filtering and discuss about the Homomorphic

Filtering properties. 8M

10. a) Explain about the Homomorphic prediction. 7M b) Write the procedure for Analysis/Synthesis structure for zero and minimum-phase

synthesis. 8M




DESIGN OF FAULT TOLERANT SYSTEMS (Electronics and Communication Engineering)



Unit – I

1. a) Develop an expression to substantiate the relation between Reliability, Failure Rate and Mean Time between Failures?

10M

b) A system consists of elements A, B, C and D connected as shown in Fig.1, the predicted reliabilities of the components are as follows RA=0.85, RB=0.9, RC=0.8, RD=0.95. If the system reliability is to be improved to a value of 0.97, determine the reliability goal of each component. Assume constant failure rate of all elements and also calculate the system reliability.

Fig.1

5M

2. a) Differentiate between a failure and a fault. Illustrate the features, functionality and its various faults of "stuck-at faults" model with examples and figures.

8M

b) Examine the need and working of Series and parallel systems with relevant figure and expressions.

7M

Unit – II

3. a) Illustrate with an example, the signature analysis technique for fault detection showing the circuitry under test and generation of signatures for that circuitry.

8M

b) Given the logic network shown below determine the tests for checking all single node faults using partial Boolean difference method.

Fig.2

7M

4. a) Explain the one-dimension path sensitization method of test generation for combinational logic circuits with relevant figures and example.

7M

b) Derive a test for α s-a-0 for the following circuit using D algorithm method.

Fig.3

8M

Cont…2

:: 2 ::

Unit – III

5. a) What is static Redundancy? Illustrate how Triple Modular Redundancy is used to obtain fault masking highlighting the features, functionality, working principle, advantages and drawbacks of TMR with relevant figures and expressions.

9M

b) Explain the need, features and functionality of Software Redundancy. 6M 6. a) Illustrate the features, functionality and working principle of Self purging system with a

neat figure, highlighting its advantages and drawbacks. 8M

b) Examine the features and working of 5MR Reconfiguration scheme with relevant figures and expressions.

7M

Unit – IV

7. a) Describe how the totally self-checking checker for m-out-of-n codes is carried out with relevant figures, expressions and examples.

8M

b) Examine the features and functionality of totally self-checking PLA design with relevant figures and expressions. Also explain the different types of faults than can occur in PLAs.

7M

8. a) What is fail safe design? Illustrate the fail-safe design of synchronous sequential circuits using partition theory considering the Mealy type sequential machine with relevant figures and expressions.

8M

b) Illustrate the features, functionality and working of self-checking sequential machines with a neat figures and relevant expressions.

7M

Unit – V

9. a) Illustrate how control logic procedure is used in the design of testable combinational logic circuits with relevant expressions and figures.

8M

b) List the two ways for autonomous testing of sequential circuits and explain in detail the forced state exhausting testing with a neat figure.

7M

10. a) Examine the random access scan technique. Explain the addressable latches used in random access scan technique with relevant figures, the test procedure of a network with random access scan in/scan out network and the advantages and drawbacks of this technique.

10M

b) Illustrate how Built-in test can be used to enhance the testability of VLSI chips. Explain the working principle and the concept of the modular built-in test with a neat figure.

5M




UTILIZATION OF ELECTRICAL ENERGY (Electrical and Electronics Engineering)



Unit – I

1. a) Discuss the need of electric drives in detail. Also classify various drives. 7M b) A 4 pole dc series motor runs at 500rpm on 400volts supply taking 20A, all the 4 field

coils being normally connected in series. Estimate the current and speed of the motor if the field coils are connected in parallel groups of 2 in series. The load torque varies as the square of the speed. Assume the flux to be proportional to current and neglect losses.

8M

2. a) Discuss the various industrial loads. What is meant by load equalization? 7M b) A dc series motor runs at 1000rpm taking 100A at 400V. A diverter having double the

resistance of the field winding is then connected in parallel with it. Estimate the change in speed if the torque varies as the square of the speed. Assume unsaturated field and neglect losses.

8M

Unit – II

3. a) Explain the various circuits used in resistance welding. 7M b) Dielectric heating is to be employed to heat a slab of insulating material 20mm thick and

1530mm2 in area. Power required is 200W and a frequency of 3MHz is to be used. The material has a permittivity of 5 and a power factor of 0.05. Determine the voltage necessary and the current which will flow through the material.

8M

4. a) Explain the following: i. Resistance heating ii. Induction heating

7M

b) A 15kV, 220V single phase resistance oven employs nickel-chrome wire for its heating element. If the wire temperature is not to exceed 10000C and the temperature of the charge is to be 6000C, calculate the diameter and length of the wire. Assume radiating efficiency to be 0.6 and emissivity as 0.9. For nickel chrome, resistivity is 1.016x10-6Ωm

8M

Unit – III

5. a) Explain the working of any one of discharge lamps. 7M

b) Obtain the equation for the illumination at a particular point using the laws of illumination.

8M

6. a) It is desired to illuminate a drawing hall with an average illumination of about 250 lux. The area of the hall is 30mx20m. The lamps are to be fit at 5m height. Find out the number and size of incandescent lamps required for an efficiency of 12 lumens per watt. Depreciation factor is 0.85 and utilization factor is 0.4.

8M

b) Define mean spherical candle power (MSCP). Determine the MSCP of a lamp emitting 1000 lumens. A surface inclined at an angle of 600 to the rays is kept 5 meters away from a 100c.p lamp. Find the average intensity of illumination on the surface.

7M

Cont…2

:: 2 ::

Unit – IV

7. a) Explain the various features of traction motors. 8M b) A train has scheduled speed of 60km/hour between the stops which are 6km apart.

Determine the crest speed over the run, assuming trapezoidal speed time curve. The train accelerates at 2kmphps and retards at 3kmphps. Duration of stops is 60 seconds.

7M

8. a) Write short notes on: i. Rheostatic braking ii. Regenerative braking

8M

b) A suburban electric train has a maximum speed of 70kmph. The schedule speed including a station stop of 30 seconds is 45kmph. If the acceleration is 1.5kmphps, find the value of retardation when the average distance between stops is 4km.

7M

Unit – V

9. a) Explain how an actual speed-time curve for an electric train service can be replaced by a Quadrilateral speed-time curve. Deduce from first principle the relation between acceleration, retardation, maximum speed, running time and the distance between stops assuming a simplified speed-time curve.

9M

b) A locomotive accelerates a 350-tonne train up a gradient of 1 in 100 at 0.8kmphps. Assuming the co-efficient of adhesion to be 0.25, determine the minimum adhesive weight of the locomotive. Assume train resistance 45N per tonne and allow 10% for the effect of rotational inertia.

6M

10. a) Clearly explain the tractive effort for propulsion of train. 7M b) An electric train weighing 450 tonnes has to maintain an average speed of 40kmph

between two stations 3km apart on an incline of 1 in 200. The train accelerates at 2kmphps and restarts at 3kmphps. The tractive resistance is 5kg per tone and the allowance for rotational inertia is 10%. Assuming a trapezoidal speed time curve, find the energy consumption for the run while going up the incline. The overall efficiency may be taken as 65%.

8M




ELECTRICAL DISTRIBUTION SYSTEMS (Electrical and Electronics Engineering)



Unit – I

1. a) Explain the classification of loads with necessary characteristics. 9M b) Explain the following terms with respect to distribution systems:

i. Demand factor ii. Loss factor iii. Maximum Demand

6M

2. a) Explain the following: i. Load factor ii. Coincidence factor iii. Diversity factor Also give the relationship between load factor and diversity factor.

8M

b) Assume that the river side distribution substation of the NL and NP company supplying Ghost Town, which is a small city, experiences an annual peak load of 3500kW. The total annual energy supplied to the primary feeder circuit is 10,000,000kWh. The peak demand occurs in July or August and is due to air conditioning load: i. Find the annual average power demand ii. Find the annual load factor

7M

Unit – II

3. a) What are the basic design considerations in Distribution feeders? Explain about Radial feeder.

8M

b) With the help of a diagram, explain the basic design practice of the secondary distribution system.

7M

4. a) Explain single phase two wire lateral with ungrounded neutral. 8M b) Compare the four and six feeder patterns of substation service area if they are voltage

drop limited feeders. 7M

Unit – III

5. a) Derive the necessary equations for power loss in uniformly distributed lines. 8M b) Derive the equations for voltage drop in Non-uniformly distribution system.

7M

6. a) Compare three phase balanced and non-balanced systems. 6M b) A three-phase express feeder has an impedance of 6+j20Ω per phase. At the load end, the

line-to-line voltage is 13.8kV and the total three-phase power is 1200kW at lagging power factor of 0.8. By using the line to neutral equivalent method determine the following: i. The line-to-line voltage at the sending end of the feeder ii. The power factor at the sending end iii. The copper loss of the feeder iv. The power at the sending end in kW

9M

Cont…2

::2::

Unit – IV

7. a) What do you mean by coordination? Discuss the coordination between two fuses. 7M b) Differentiate between a distribution circuit breaker and a distribution reclosure. Identify

respective location using a diagram.

8M

8. a) What is automatic line sectionalizer? Explain their purpose and advantages. 8M b) With time current characteristics of fuse explain the working of a fuse. 7M

Unit – V

9. a) Discuss the procedure to determine the best location of capacitor. 6M b) A 3 phase, 50Hz, 400V motor develops 100H.P. (74.6kW), the power factor being 0.75

lagging and efficiency 93%. A bank of capacitors is connected in delta across the supply terminals and power factor raised to 0.95 lagging. Each of the capacitance units is built of 4 similar 100V capacitors. Determine the capacitance of each capacitor.

9M

10. a) Discuss the effect of series capacitors on voltage control. 6M b) A factory operates at 0.8 p.f. lagging and has a monthly demand of 750kVA. The monthly

power rate is Rs.8.50 per kVA. To improve the power factor, 250kVA capacitors are installed in which there is negligible power loss. The installed cost of equipment is Rs.20,000 and fixed charges are estimated at 10% per year. Calculate the annual saving effected by the use of capacitors.

9M


(AUTONOMOUS) B. Tech VIII Semester Supplementary Examinations, April/May - 2017

(Regulations: VCE-R11)

DIGITAL CONTROL SYSTEMS

(Electrical and Electronics Engineering)



Unit – I

1. a) Describe the functional block diagram of a sampled data control system. 8M b) Describe the advantages of digital controller over analog controller.

7M

2. a) Explain operation of sample and hold circuit with the help of neat circuit diagram and waveform.

8M

b) Explain the operation of digital to analog converter using R-2R ladder network.

7M

Unit – II

3. a) State and prove Initial value theorem for Z – transform. 7M

b) Determine the inverse z-transform of

2

2

1

z zX z

z

8M

4.

a) Solve the difference equation in terms of 0x and 1x using z –transform.

2 3 1 2 0x k x k x k

7M

b) Find the z- transform of the following:

1

1x n

s s

1 , 0

0, 0

aTx t e t

t

8M

Unit – III

5.

a) The state model of a system is given by

1 1 0 0

( ) 0 1 0 ( ) 1

0 0 2 1

x t x t u

;

1 1 1 ( )y x t with D=0. Obtain state model.

7M

b) Check the controllability and observability of the following representation using Kalman’s test

1 0 0 1

( ) 0 2 0 ( ) 0

0 0 1 1

x t x t u

; 1 1 0 ( ).y x t

8M

Cont…2

:: 2 ::

6. a) Construct the state variable model using SFG technique for the system with transfer

function 2

2

( ) 2 6 5.

( ) ( 1) ( 2)

Y S s s

U S s s

7M

b) For a system represented by state equation 2

2,

2

t

t

ex t Ax t x t

e

when

1

02

x

and t

t

ex t

e

when

10

1x

. Find system matrix A and state

transition matrix.

8M

Unit – IV

7. a) Discuss briefly the stability analysis of closed loop system in the Z-plane. 6M b) Determine the stability of the system represented by the characteristic polynomial using

Jury’s test P(z) = z4-1.2z3+0.07z2+0.3z-0.08=0

9M

8. a) Explain briefly the stability analysis of discrete systems using bilinear transformation. 5M b) Determine the stability of the following system described by difference equation where

x(k) is the input and y(k) is the output of the system. y(k) – 0.6y(k-1)-0.81y(k-2)+0.67y(k-3)-0.12y(k-4) = x(k).

10M

Unit – V

9. Consider the regulator system given by the plant model:

1 2 1 1

( ) 0 1 3 ( ) 0

1 1 1 1

x t x t u

By use of the state feedback control u kx , it is desired to place the closed loop poles at -1+j, -1-j, -3. Find feedback gain matrix k by any of three methods.

15M

10. a) Compare and contrast the features of lag, lead and lag lead compensators and highlight their applications.

9M

b) With examples differentiate between full order and reduced order observers. 6M




SOLAR ENERGY AND ITS APPLICATIONS (Electrical and Electronics Engineering)



Unit – I

1. a) What do you mean by renewable and non renewable energy sources? Bring out the difference between them.

7M

b) Estimate the monthly average daily global radiation on a horizontal surface at Vadodara (22000'N, 73010'E) during the month of march if the average sunshine hours per day are 9.5.

8M

2. a) What are the reasons for variation in solar radiation reaching the earth than received at the outside of the atmosphere?

7M

b) Define the following terms: i. Solar constant ii. Declination angle iii. Altitude angle iv. Zenith angle

8M

Unit – II

3. a) What are the main components of flat plate solar collector? Explain the function of each.

7M

b) With the help of a neat sketch explain natural circulation pressurized type solar water heater.

8M

4. a) Classify solar energy storage system. Explain any one of the storage systems. 7M b) With a neat sketch explain the working of solar pond electric power plant.

8M

Unit – III

5. a) Draw the equivalent circuit of a photo voltaic cell. Explain briefly. 8M b) What are the advantages and disadvantages of photovoltaic solar energy conversion? 7M 6. a) Draw the current voltage characteristics and power voltage characteristics of a solar cell.

Explain. 7M

b) A photo voltaic cell has an open circuit voltage of 0.6V and a short circuit current of 250A/m2 at a cell temperature of 400C. Calculate the voltage and current density that maximizes the power of the cell. What would be the corresponding maximum power input per unit cell area? Assume photo voltaic cell area of 20mm2.

8M

Unit – IV

7. a) What is the principle of solar photo voltaic power generation? What are the main elements of a PV system?

8M

b) Bring out the applications of solar photo voltaic systems. 7M

Cont…2

:: 2 ::

8. a) Write a note on the following with respect to solar PV power generation: i. On site storage of power ii. Grid connection

6M

b) A residential house has a power requirement of 400W for 4 hours every night. It is proposed to meet the requirement by using a PV array, a battery storage system and an inverter. The whole system is over designed so that it can meet one extra night requirement even if there has been no sunshine during the day. Calculate the number of PV modules and batteries required. Data given: Solar radiation is available for an average of six hours daily and the average hourly global radiation flux incident on the array is 650W/m2 Battery rating=12V, 120Ah Depth of discharge=0.7 Charging and discharging efficiency=0.9 Inverter efficiency at full load = 0.85

9M

Unit – V

9. a) Maintenance of solar power is cheap. Justify the statement. 5M b) A solar hot water system having an array of flat plate collectors with an area of 30m2 is

installed in a factory. It costs Rs.2,50,000 and is set up with an initial down payment of 20% of the investment, the balance 80% being taken as a soft loan to be repaid in equal annual installment over a 5 year period at an interest rate of 5%. The cost of conventional fuel saved in the first year is Rs.47,000 and this cost increases at the rate of 5% every year. The annual expenditure required by way of maintenance, electrical energy for running subsidiary equipments, local taxes, insurance, etc., is Rs.20,000 in the first year and this expense increase at the rate of 5% every year. Tax deductions are permissible only on depreciation, which is allowed at the rate of 25% each year and the company income tax rate is 30% each year. Assuming that the cost of an equivalent conventional energy system is Rs.18,000 and that the market discount rate is 10%, calculate the cumulative savings over a period of 15 years.

10M

10. a) What do you mean by payback period? Give the expression for calculating: i. Savings in the income ii. Payback period

7M

b) Discuss safety issues with respect to solar power generation. 8M




POWER PLANT ENGINEERING (Mechanical Engineering)



Unit – I

1. a) Explain the different properties of coals used in steam power plants. 7M b) Explain and compare forced and induced draught cooling towers.

8M

2. a) Discuss various factors to be considered for the selection of site for steam power plants. 7M b) Discuss about the dust collection methods in steam power plants.

8M

Unit – II

3. a) Describe briefly the main components of a diesel power plant with schematic diagram. 10M b) Explain briefly about super charging in diesel power plant.

5M

4. a) Explain the working of gas turbine power plant with schematic diagram. 10M b) Explain briefly about closed cycle gas turbine plant.

5M

Unit – III

5. Describe the essential features of hydro-electric power plant.

15M

6. a) Explain in detail the hydrological cycle with neat diagram. 8M b) At a particular site the mean monthly discharge is as follows:

Month Discharge m3/s Month Discharge m3/s

January 100 July 1000

February 225 August 1200

March 300 September 900

April 600 October 600

May 750 November 400

June 800 December 200

Construct the hydrograph for the same.

7M

Unit – IV

7. a) Discuss the advantages and limitations of tidal power generation. 8M b) With a neat sketch, explain the flat plate solar collector. 7M

8. a) Describe the general categories of geothermal sources of energy that have been identified so far.

8M

b) Highlight the advantages and disadvantages of geothermal and other energy forms. 7M

Unit – V

9. a) With a neat sketch, explain the advantages and disadvantages of a fast breeder reactor. 8M b) Explain the significance of load curve and how it differs from load duration curve.

7M

10. a) Explain the method to reduce pollution. 7M b) A 100MW Power station delivers 100MW for 2 hours, 50MW for 6 hours and shut down

for the rest of each day. It is also shut down for maintenance for 45 days annually. Calculate annual load factor.

8M




AUTOMATION IN MANUCATRURING (Mechanical Engineering)



Unit – I

1. a) List the various strategies of automation. 6M b) Compare the features of various types of automation. 9M 2. a) A manufacturing line is trying to automate its feed line by using a buffer station which

has to transport heavy cast iron blocks. Explain which method of transport will be used for this application.

7M

b) Explain with a sketch working of Geneva mechanism. Mention its applications in automation.

8M

Unit – II

3. a) State two problem areas in analysis of automated flow lines that must be addressed. Explain them briefly.

8M

b) Mention any seven common reasons for downtime on an Automated Production line. 7M 4. A 20 station transfer line is proposed. Line operates at a production rate of 50pieces/hr at

100% efficiency. p=0.005 breakdowns/cycle. Average downtime per line stop is 8minutes. The operating cost of the line is Rs.75/hr. Initial machining cost is Rs.3/part. 20 cutting tools (one tool per station) last for 50 parts each and average cost per tool is Rs.2 per cutting edge. (‘p’ value is a comparative value to a similar workstation of probability of station breakdown per cycle). Calculate: i. Production rate ii. Line efficiency iii. Cost/unit piece produced in the line

15M

Unit – III

5. a) Sketch and explain the various work transfer systems in production lines. 7M b) Draw the precedence diagram for the following:

Operation Tek Preceded by

1 0.2 -

2 0.4 -

3 0.7 1

4 0.1 1,2

5 0.3 2

6 0.11 3

7 0.32 3

8 0.6 3,4

9 0.27 6,7,8

10 0.38 5,8

11 0.5 9,10

12 0.12 11

8M

Cont…2

:: 2 ::

6. a) What are the various ways of solving line balancing in assembly lines? Explain one method in detail.

9M

b) List and compare the features and applications of any 3 material handling equipments. 6M

Unit – IV

7. a) Draw the block diagram of a typical computerized adaptive control for milling process. Also explain the same.

7M

b) Briefly discuss about ACO and ACC. 8M 8. a) What are the advantages of using adaptive control systems in turning operation? 7M b) With the help of a neat block diagram, discuss the adaptive control with optimization for

grinding process to obtain the optimal process parameters.

8M

Unit – V

9. a) List the advantages of concurrent engineering in automation. 6M b) Draw the schematic of a selective laser sintering device and explain its working principle. 9M 10. a) What is BPE? Explain the advantages of BPE in industries. 8M b) Describe the software configuration in BPE. 7M




NON CONVENTIONAL SOURCES OF ENERGY

(Mechanical Engineering)



Unit – I

1. a) Define the following terms: i. Latitude ii. Hour angle iii. Surface azimuth angle iv. Angle of incidence

8M

b) What are instruments used for measuring solar radiation? Explain the working of angstrom Pyrheliometer for solar radiation measurement.

7M

2. a) Describe the working of parabolic trough collectors with the help of its functional diagram indicating various components.

9M

b) Briefly explain Terrestrial Solar Radiation with relevant diagrams.

6M

Unit – II

3. a) Describe the different methods of energy storage system and explain the solar energy storage system.

8M

b) What is principle of collection of solar energy in a solar pond? Explain the principle of solar pond.

7M

4. a) How wind energy can be converted to electrical energy? 7M b) What is Betz coefficient? Show that the ideal maximum theoretical efficiency is 59% for

horizontal axis windmill.

8M

Unit – III

5. a) Explain the operation of a two-stage high rate anaerobic digester. 7M b) Explain how Biogas can be used for cooking. Give the flow diagram.

8M

6. a) Define geothermal sources. Also classify geothermal sources. 7M b) Discuss the potential aspects of geothermal energy in India.

8M

Unit – IV

7. a) Draw the schematic diagram of the OTEC open cycle plant and explain the basic parts. 7M b) What are the advantages and disadvantages of OTEC systems? Also explain their

environmental impacts.

8M

8. a) What are the advantages and disadvantages of tidal power plants? 8M b) How is wave energy converted to produce electricity? Explain. 7M

Unit – V

9. a) Describe the basic principle of operation of an MHD generator. Derive expressions for maximum power generation per unit volume of a generator.

8M

b) What are potential applications of a fuel cell?

7M

10. a) Draw a conceptual block diagram of a fuel cell power plant and explain the details of each block.

8M

b) What is the present state of development in fuel cell technology? 7M




AIRCRAFT SYSTEMS AND INSTRUMENTATION

(Aeronautical Engineering)



Unit – I

1. Explain flight control linkage systems in detail.

15M

2. Explain the Inter-relationship of flight control, guidance and vehicle management systems. 15M

Unit – II

3. Write short notes on fuel flow control and air flow control.

15M

4. a) Write short note on fuel transfer pumps. 8M b) Explain about in-flight refueling. 7M

Unit – III

5. a) Draw a simple hydraulic circuit and explain. 7M b) Write a short note on hydraulic fluid.

8M

6. a) Write a note on variable frequency generation. 8M b) Write a short note on secondary power distribution and power switching. 7M

Unit – IV

7. a) What are the uses of bleed air? 5M b) Write a note on wing and engine anti-ice control.

10M

8. Write notes on ram air cooling and fuel cooling. 15M

Unit – V

9. a) Explain preliminary systems safety analysis. 5M b) Write short notes on top-down approach and bottom-up approach.

10M

10. Explain altimeter and air speed indicator. 15M




AIRPORT MANAGEMENT (Aeronautical Engineering)



Unit – I

1. a) Explain the various ownership and management models of airports. 10M b) What are the different organizational structures used for airport management?

5M

2. a) Explain in detail about air operator and briefly describe 6 models of owner/operator combination.

10M

b) What is the function of airport public relation manager? 5M

Unit – II

3. a) What are the critical components of an Air Traffic Management system? 8M b) Write a short note on Air traffic control tower.

7M

4. a) Describe the components of airport terminal. 8M b) Briefly describe about historical development of airport terminals. 7M

Unit – III

5. a) Discuss about security at general aviation airports. 7M b) Write a short note on pavement management system in airports.

8M

6. a) Explain airport snow and ice control. 7M b) Describe the functions of Aircraft Rescue and Fire Fighting (ARFF). 8M

Unit – IV

7. Explain in detail about Airport financial accounting.

15M

8. Describe revenue strategies of commercial airports.

15M

Unit – V

9. a) Explain demand management and administrative approaches to demand management. 8M b) Describe the different approaches to reduce airside delays.

7M

10. Explain in detail the measurement and attribution of delays. 15M




AIR LINE MANAGEMENT

(Aeronautical Engineering)



Unit – I

1. Explain the structure of the airline industry detailing growth and regulation as well as deregulation.

15M

2. a) Discuss the different levels of management and explain each level’s role. 10M b) Define regional air carriers and their role in air transportation system.

5M

Unit – II

3. Explain in detail factors affecting fleet planning process.

15M

4. a) Difference between hub and spoke and point to point system. 5M b) Explain fleet planning process and information needed for fleet planning.

10M

Unit – III

5. What are the various airline costs? Explain.

15M

6. a) What is the mission of scheduling and briefly explain the factors balancing public service and economic aspects of scheduling.

5M

b) Explain the ground operations and facility limitations on airline scheduling. What are the data limitations on airline scheduling?

10M

Unit – IV

7. a) Explain different types of Special Air Freight Services. 5M b) Explain the factors affecting air freight rates.

10M

8. a) Define the types of air freight rates. 10M b) Explain the types of carriers in air cargo industry.

5M

Unit – V

9. Explain Seat inventory control problem.

15M

10. a) What are different objectives of Revenue management? 7M b) Explain the Expected marginal revenue of the airline. 8M



(Regulations: VCE- R11/R11A)

ADVANCED STRUCTURAL DESIGN

(Civil Engineering)



Unit – I

1. Design a Counter fort retaining wall based on the following data: Height of Wall above G.L=6.5m SBC of Soil=170kN/m2 Angle of Internal friction=350, Density of Soil=16kN/m3 Spacing of Counter forts=3m c/c. Adopt M20 grade concrete and Fe415 steel. Draw the sectional elevation through counter forts.

15M

2. Design an RC circular water tank with flexible base and open at top for capacity of 600000 liters resting on ground. The materials are M30 grade concrete and HYSD reinforcement of Fe415. Provide 5m depth with 0.3m free board. Draw the following views: i. Cross Section of tank showing reinforcement details in dome, tank walls and floor slab ii. Plan of tank showing reinforcement details

15M

Unit – II

3. Design a square bunker to store 300kN of coal, for the following data: Unit weight of coal=8340N/m3; Angle of repose=300C. The stored coal is to be surcharged at its angle of repose. Take permissible stress in steel as 140N/mm2.

15M

4. A Concrete chimney of height 66m having external diameter of 4m throughout the height. The chimney has fire brick lining of 100mm thickness, provided up to height of 42m above ground level, with an air gap of 100mm. The temperature of gases above surrounding air is 2000C. Take the coefficient of expansion of concrete and steel=11x10-6 per degree centigrade and Es=2.05x105N/mm2. Use M25 grade concrete.

15M

Unit – III

5. Design a suitable section for a simply supported gantry girder for the following data: pacing of the columns=4m, Crane capacity=160kN, Weight of the crane excluding the crab=250kN Weight of the crab=60kN Minimum clearance of the cross travel=0.8m, Wheel base=5.3m c/c distance between gantry girders=20m, Height of the rail=105 mm Expected number of stress cycles= 2 x 106, grade of steel=Fe250.

15M

6. Design a welded plate girder of 25m span to support a uniformly distributed live load of 75kN/m over the span using the following data: Effective span of the girder=30m Distributed live load=50kN/m Yield stress of steel=250N/mm2 Top flange is restrained laterally. Design the cross sectional details of the plate girder to conform to the specifications of IS: 800-2007.

15M

Unit – IV

7. a) Explain in which situations the T-beam bridge is preferred over simple slab bridge. 7M b) Explain how the live load is distributed on the longitudinal girders of a T-beam bridge.

Also write the assumptions made there on. 8M

Cont…2

::2::

8. Compute the design moments and shears for the deck slab main girder for a RCC T-Beam Bridge for the following data: Clear width of road way=7.5m Span between c/c of bearings is 16m Live load=I.R.C Class AA (Tracked vehicle) Average thickness of wearing coat=80mm Materials: M25 grade concrete and Fe415 grade HYSD bars. Sketch the typical details of the reinforcements.

15M

Unit – V

9. a) Explain how the elasto plastic material performs better than linear elastic material for earthquake resistant structures.

7M

b) A Special reinforced concrete moment resisting frame building with infill panels is situated in Delhi. Height of building is 12m. The building is resting on medium soil. The base dimension of building at plinth level is 24m. Determine the design horizontal seismic coefficient and vertical seismic coefficient for a damping of 2%.

8M

10. a) What is ductility? Discuss the factors affecting ductility of RC structures. 7M b) Illustrate with detailed sketches, the ductile detailing provisions for beams (flexural

reinforcement, shear reinforcement, laps, and development length), columns (longitudinal reinforcement, lateral reinforcement, laps) and footings.

8M




GROUND IMPROVEMENT TECHNIQUES

(Civil Engineering)



Unit – I

1. a) What is meant by dewatering? What are the different methods of lowering ground water table?

7M

b) With neat sketches explain the working principle of electro-osmosis method of dewatering.

8M

2. a) Explain the importance of foundation drains and blanket drains with neat sketches. 7M b) With neat sketches explain the working principle of vacuum well point system of

dewatering.

8M

Unit – II

3. a) Explain with neat sketches application of compaction grouting. 6M b) With neat sketches explain vibrofloatation method of compacting a granular soil.

9M

4. a) With brief procedure explain the ground modification by thermal method. 7M b) Explain the concept of sand wick geo drains with the help of sketch.

8M

Unit – III

5. a) Explain with illustrations the mechanism of reinforced earth wall. 7M b) What are the basic components of reinforced soil structure? Explain the function of each

of the components.

8M

6. a) Discuss on suitability and application of lime stabilization. 7M b) Explain the importance of reiforcements. Mention various reinforcing materials that can

be used in soils. 8M

Unit – IV

7. a) What are the types of geo-synthetics? And what are the functions of geo-membranes? 8M b) What are the applications of Geo-textiles?

7M

8. a) What are the functions and applications of Geo-grids? 8M b) What are the properties of geo-foams?

7M

Unit – V

9. a) What are the various problems that are encountered for foundations constructed on expansive soils?

8M

b) Discuss the principle and functioning of under-reamed piles.

7M

10. a) What are the factors influencing the swelling behavior of soil? 8M b) Explain briefly various methods that are to be used to improve the expansive soils as a

foundation material. 7M




PRE STRESSED CONCRETE STRUCTURES

(Civil Engineering)



Unit – I

1. a) Write about the general principles of pre - tensioning and post - tensioning concrete members.

8M

b) Explain about the need for using high strength concrete in pre-stressing concrete members.

7M

2. a) Explain about the Freyssinet system of pre-stressing concrete members along with neat sketches.

8M

b) Write about the advantages and limitations of pre-stressing. 7M

Unit – II

3. a) What is loss of pre-stress? Briefly explain types of losses encountered in pre-tensioned and post-tensioned PSC members.

6M

b) A pre-tensioned concrete beam of rectangular cross section 200mm wide and 400mm deep is pre-stressed by ten 7mm diameter wires located at 80mm from the soffit of the beam. If the wires are initially tensioned to a stress of 1200MPa, calculate the percentage loss of pre-stress due to elastic deformation. Take Ec=31.5kN/mm2 and Es=210kN/mm2.

9M

4. A post-tensioned cable of a beam 10m long is initially tensioned to a stress of 1000Mpa at one end. If the tendons are curved so that the slope is 1 in15 at each end with an area of 600mm2, Calculate the loss of pre-stress due to friction, given the following data: Co-efficient of friction between cable and the duct = 0.55, friction co-efficient for wave effect, k=0.0015/m. During anchoring, if there is a slip of 3 mm at the jacking end, calculate the final force in the cable and the percentage loss of pre-stress due to friction and slip when: i. Jacking the tendons at one end ii. Jacking the tendons from both ends

15M

Unit – III

5. a) A pretensioned T section has a flange width of 1500mm and thickness of flange 200mm width and depth of rib are 300mm and 1200mm respectively. The area of high tensile is 5000mm2 at an effective depth of 1800mm. The characteristic strength of concrete and steel are 40MPa and 1600MPa respectively. Calculate the flexural strength of section as per IS1343 – 2012.

8M

b) A symmetrical double T section pre-stressed beam has total flange width 1200x100mm. The overall depth is 500mm and thickness of each rib is 100mm. the effective pre-stressing force is 150kN.the cable is located at 100mm from the soffit. The characteristic strength of concrete can be taken as 40MPa Assuming the grouting as 100% effective, determine the ultimate moment capacity of the section.

7M

Cont…2

::2::

6. a) Explain the modes of shear failure in PSC beams. 8M b) A post tensioned beam of rectangular cross section 200mm wide and 400mm deep is

10m long and carries an applied load of 8kN/m on the beam. The effective pre-stressing force in the cable is 500kN. The cable is parabolic with zero eccentricity at the support and maximum eccentricity of 140mm of the center of the span. Calculate the principal stress at the supports. What will be the magnitude of principle stresses at the support in the absence of pre-stress?

7M

Unit – IV

7. a) Explain Spalling and Bursting tension. 8M b) The end block of pre-stressed concrete beam rectangular in section is 150mm wide and

400mm deep and effective pre-stressing force of 500kN is transmitted to the concrete by a distribution plate of 150mm wide and 150mm deep eccentrically located at the ends. Calculate the maximum bursting force, maximum tensile stress and design the end block use Fe415 steel.

7M

8. a) Explain with sketch the propped and Un propped constructions. 3M b) A composite beam is made by casting 300x900mm precast pre-stressed with cast in situ

slab of 1500x150mm. The effective pre-stress of 12MPa at the soffit and zero at the top. Calculate the uniformly distributed for the composite action on a simply supported span of 16m for the following conditions, concrete weighs 25kN/m3: i. Un propped construction ii. Propped construction

12M

Unit – V

9. a) What is the importance of controlling deflections in beams? 5M b) A pre-stressed concrete simply supported beam of rectangular section 250mm breadth

and 500mm depth has an effective span of 8m and carries a live load uniform distributed load of 3kN/m. It is pre-stressed by straight cable carrying an effective force of 250kN at a constant eccentricity of 80mm. Estimate the short term deflection and long term deflection at mid span. Assume live loads and dead loads are applied simultaneously after release of pre-stress. Take Ec for concrete as 40kN/mm2, loss of pre-stress as 20% and creep co-efficient as 2.0.

10M

10. a) Describe short term deflections in PSC beams. 5M b) A rectangular concrete beam of cross section 150mm wide and 300mm deep is simply

supported over a span of 8m and is pre-stressed by means of a symmetric parabolic cable , at a distance of 75mm from the bottom of the beam at mid span and 125mm from the top of the beam at support sections. The cable carries pre-stressing force of 350kN. The modulus of elasticity of concrete is 38kN/mm2, calculate: i. The deflection at mid span when the beam is supporting its own weight ii. The concentrated load which must be applied at mid span to restore it to the level

of supports

10M

hall ticket no: question paper code: a1015 (autonomous) …b) explain in detail about object naming...

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