code no: rt31013 r13 set - 1 iii b. tech i semester regular ... bitsvizag/bits/exam...

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Code No: RT31013

III B. Tech I Semester Regular/Supplementary Examinations, October/November- 2016

DESIGN AND DRAWING OF REINFORCED CONCRETE STRUCTURES

(Civil Engineering)

Time: 3 hours Max. Marks: 70

Answer any ONE Question from Part – A and any THREE Questions from Part – B Use of IS: 456-2000 and design charts from SP-16 is allowed.

For all designs adopt Limit State Method ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

PART –A

1 Design a simply supported rectangular beam to carry 30kN/m superimposed load over a

span of 6m on 460mm wide supports. Use M20 grade concrete and FE 415 grade steel.

Check the design for all necessary conditions. Draw to a suitable scale:

[28M]

a) Longitudinal section showing the reinforcement details.

b) The cross section of the beam at salient points, showing reinforcement details

OR 2 Design a continuous RC slab for a hall 6.5m and 13.5m long. The slab is supported on

RCC beams each 240mm wide which are monolithic. The ends of the slab are supported

on walls. 300mm wide. Design the slab for a live load of 2 kN/m2. Assume the weight

of roof finishing equal to 1.5 kN/m2. Use M15 concrete and Fe 415 steel.

[28M]

a) Draw the reinforcement of the slab in plan view

b) Draw cross section of the slab including beams with reinforcement details.

PART -B

3 a) Define the term ‘Partial safety factors’ as used in limit state design. Identify the various

factors and state the values recommended in IS 456

[7M]

b) Compare ‘Working stress method’ and limit state design of RCC structures. Explain the

answer with suitable examples.

[7M]

4 The T beam floor consists of 12cm thick R.C. slab monolithic with 30cm wide beams.

The beams are spaced at 3.5m center to center and their effective span is 8m. If the

superimposed on the slab is 6.5kN/m2, design an intermediate beam and an end beam.

Use M20 mix and TMT 415 grade steel.

[14M]

5 Design a slender circular column of 35cm diameter with the following data.

Unsupported length = 8m. Effective length = 5m. Axial load = 500kN. Moment at top =

60kNm. Moment at bottom = 40 kNm. The column bends in double curvature

[14M]

6 Design a square spread footing to carry a column of 1200kN from a 40 cm square tied

column containing 20m bars as the longitudinal reinforcement. The bearing capacity of

soil is 150 kN/m2. Consider base of footing as 1m below the ground level. The unit

weight of earth is 20 kN/m3. Use σy = 415 N/mm

2 and σck = 20 N/mm

2

[14M]

7 The section of a cantilever beam designed for a span of 4.0m is having dimensions 300

х 600mm with 3 numbers 28mm diameter bars in compression and 3 numbers 20mm

diameter bars in tension. The beam has been designed for a bending moment of

180kNm (at support) under service loads, of which 60 percent is due to permanent

(dead) loads. The loading is uniformly distributed on the span. Assume M20 concrete

and Fe 415 steel

[14M]

*****

R13 SET - 1

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Code No: RT31013



(Civil Engineering)




PART –A

1 A T beam floor consists of 12cm thick R.C. slab monolithic with 30cm wide beams.

The beams are spaced at 4.0m center to center and their effective span is 7.5m. If the

superimposed on the slab is 7.0 kN/m2, design an intermediate slab. Use M20 mix

and TMT 415 grade steel .draw to scale ;

[28M]

a) Longitudinal section showing the reinforcement details

b) The cross section of the beam at salient points, showing reinforcement details

OR

2 Design an isolated square footing for a column 450mm х 450mm reinforced with 8-

25mm diameter bars carrying a service load of 2000 kN The bearing capacity of soil

is 250 kN/m2 at a depth of 1.5m below ground. The footing is restricted to 2.0m in

one direction Assume M20 grade concrete and Fe 415 grade steel for the footing and

M25 concrete and Fe 415 steel for the column. Draw to scale:

[28M]


b) The plan showing reinforcement details.

PART -B 3 A rectangular beam section is 20cm wide and 40 cm deep up to the center of tension

steel, which consist of 4-20 mm TOR bars. Find the position of the neutral axis, the

lever arm, forces of compression and tension, cracking moment and safe moment of

resistance of concrete is of M20 mix and steel is of Fe500 grade

[14M]

4 The flange of a T beam flange of the beam is 90 cm х 10cm and web below is 30cm

х 40cm. It is reinforced with 4-20 mm plus 4-12mm Fe 415 steel bars in tension at

an effective cover of 60mm. Determine the shear reinforcement needed for a shear

force of 200kN (i) If the mix is M20 and (ii) if the mix is M30. Take load factor =

1.2.

[14M]

5 a) What is meant by slenderness ratio of a compression member and what are its

implications. Distinguish between short and long column.

[7M]

b) A short column 40cm square in cross section is reinforced with 4-20 mm bars

longitudinally which are bound together with lateral ties. Determine safe axial load

on the column

[7M]

6 Design a two-way slab simply supported on all the four edges for a room 6m х 3.5m

clear in size. The superimposed working load is 3.5 kN/m2 for (i) corners held down

and (ii) corners not held down.

1 of 2

[14M]

R13 SET - 2

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Code No: RT31013

7 A one-way slab has been designed for a simply supported span of 4.0m with an

overall depth of 170mm and clear cover of 20mm. using M20 concrete and fe 415

steel. The dead load is taken as 5.0 kN/m2 and live load of 2.0m kN/m2. The

longitudinal bars are designed as 10mm diameter 150mm c/c. verify the adequacy of

the thickness provided.

(a) Applying the limiting span/ effective depth ratio

(b) Actual calculation of total deflections

[14M]

*****

2 of 2

R13 SET - 2

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Code No: RT31013



(Civil Engineering)




PART –A

1 Design a plain concrete footing for to a rectangular column 30cm х 30cm carrying an

axial service load of 330 kN (under service loads due to dead and live loads). The net

bearing capacity of soil is 360 kN/m2 at a depth of 1.0 m below ground level.. Use σy

= 415 N/mm2 and σck = 20 N/mm

2.Draw to scale :

[28M]


b) The plan showing reinforcement details.

OR

2 Design a simply supported roof slab for a room 4.5 m х 6 m measuring from inside.

Thickness of the wall is 400 mm. The superimposed load exclusive of the self weight

is 2.5 kN/m2. The slab may be assumed to be simply supported on all four edges with

corners held down. Use M20 mix and Fe 415 grade steel.

[28M]

a) Draw the reinforcement of the slab in plan view

b) Draw cross section of the slab including beams with reinforcement details.

PART -B

3 Design a rectangular beam for an effective span of 6m.The-superimposed load is

80kN/m and size of the beam is limited to 30cm х 70cm. Use M20 mix and Fe415

grade steel.

[14M]

4 An RC beam has an effective depth of 450mm and breadth of 300mm. It contains 5-

20mm bars mild steel out of which two bars curtailed at a section where shear force at

service load is 100kN. Design the shear reinforcement if the concrete is M20

[14M]

5 Design a section of a ring beam 50cm wide and 65cm deep subjected to a bending

moment of 120kNm, twisting moment of 7.5-kNm and shear force of 150 kN at

ultimate. Use M20 mix and Fe 415 grade steel

[14M]

6 a) Explain clearly the difference in the behavior of one-way slabs and two-way slabs

with reinforcement details.

[14M]

b) Explain need for corner reinforcement in two way rectangular slabs whose corners are

prevented from lifting up

7 Explain short-term deflection. Explain the difficulty in estimating short term

deflection as per IS code procedure when applied moment at service loads is

marginally less than the cracking moment Are the nominal detailing requirements of

the code adequate for ensuring crack width control? Comment.

[14M]

*****

R13 SET - 3

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Code No: RT31013



(Civil Engineering)




PART –A

1 Design a simply supported rectangular beam to carry 35kN/m superimposed load

over a span of 5m on 330mm wide supports. Use M20 grade concrete and FE 415

grade steel. Check the design for all necessary conditions. Draw to a suitable scale.

[28M]


b) The cross section of the beam at salient points, showing reinforcement details.

OR

2 Design an isolated square footing for a column 300mm х 300mm reinforced with 8-

16mm diameter bars carrying a service load of 1500 kN The bearing capacity of soil

is 180 kN/m2 at a depth of 1.5m below ground. The footing is restricted to 1.8 m in

one direction Assume M20 grade concrete and Fe 415 grade steel for the footing and

M25 concrete and Fe 415 steel for the column.

[28M]

PART -B

3 a) What are the assumptions for the design of a reinforced concrete section for limit

state of collapse in bending?

[14M]

b) Show that the limiting depth of neutral axis for a rectangular cross section reinforced

with FE415 grade steel in 0.48d.

4 An L beam has flange of the beam is 90 cm х 12cm and web below is 23cm х 50cm.

Determine the area of compression and tension steels needed for the cross section if

it is to carry a factored bending moment of 400 kNm. Assume M20 concrete and

TMT 500 grade steel.

[14M]

5 An RC beam has an effective depth of 300mm and breadth of 150mm. It contains 4-

20mm bars. Determine the shear resistance of the concrete beam if σsv = 415 N/mm2

for (i) σck = 20 N/mm2 and (ii) σck = 30 N/mm

2

[14M]

6 Design a short circular column 6m long to carry an axial load of 250kN if both ends

of the column are fully restrained using (i) Lateral ties and (ii) helical steel.

[14M]

7 Design a simply supported roof slab for a room 8m х 3.5m clear in size if the

superimposed load is 5kN/m2. Use M15 mix and Fe 415 grade steel.

[14M]

*****

R13 SET - 4

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Code No: RT31023

III B. Tech I Semester Regular/Supplementary Examinations, October/November - 2016

POWER SYSTEMS-II (Electrical and Electronics Engineering)


Note: 1. Question Paper consists of two parts (Part-A and Part-B)

2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

PART –A

1 a) Define Geometric mean distance in a transmission line? [3M]

b) Classify the transmission lines based on the length? [3M]

c) Define surge impedance? [4M]

d) What is meant by power system transient? [4M]

e) State proximity effect? [4M]

f) What are the disadvantages of having more sag in the transmission lines? [4M]

PART -B

2 a) Derive the expression for the inductance of conductor due to external flux linkages

in a single phase transmission line.

[8M]

b) Calculate the inductance of a single phase circuit comprising of two parallel

conductors of 6mm in diameter spaced 1.1m apart. If the material of the conductor

is copper and steel with relative permeability of 50?

[8M]

3 a) Analyze a medium transmission line with nominal π method and draw the phasor

diagram?

[8M]

b) A 3 phase 50Hz transmission line is 150KM long and delivers 25MW at 110KV,

0.8 power factor lagging. The resistance and reactance of the line per conductor

per kilo meter are 0.33 ohm and 0.9 ohm respectively. The line charging

admittance is 0.3*10-6

mho/km/ph. Compute the voltage regulation and

transmission efficiency by applying the nominal π method?

[8M]

4 a) Analyze the long transmission line by rigorous solution? [8M]

b) Derive the A, B, C, D constants when two transmission lines are connected in

cascade?

[8M]

5 a) Derive the reflection and refraction coefficients of a line terminated with a

resistance?

[8M]

b) Discuss the concept of travelling waves on a transmission line?

[8M]

6 a) Discuss in detail about the shunt compensation? [8M]

b) Explain about the various factors that affect the corona?

[8M]

7 a) Derive the expression for sag of a transmission line between two supports of

unequal heights?

[8M]

b) What is meant by stringing chart and explain its applications? [8M]

*****

R13 SET - 1

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Code No: RT31023







~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

PART –A

1 a) Define Geometric mean radius of a transmission line? [4M]

b) Classify the transmission lines based on the operating voltage? [4M]

c) Write the expression for the reflected voltage wave of a long transmission line? [3M]

d) What is meant by refracted voltage wave of a long transmission line? [3M]

e) Write the importance of charging current in the power systems? [4M]

f) Define string efficiency? [4M]

PART -B

2 a) Derive the expression for the flux linkages with one sub conductor of a composite

conductor?

[8M]

b) Find the inductance of a line consisting of two ACSR conductors spaced between

conductors of 1m. The outer diameter of the single layer of aluminum strand is

50.1mm and the radius of each strand is 8.4mm. Neglect the effect of central strand

of steel on the inductance?

[8M]

3 a) Analyze a medium transmission line with nominal T method and draw the phasor

diagram?

[8M]

b) A three phase 50Hz transmission line , 100km long delivers 25MW at 100KV at

0.75 power factor lagging. The resistance and reactance of the lines per phase per

kilometer are 0.32 ohms and 0.57 ohms respectively while the admittance is

2.5*10-6

mho/ km/ph. Calculate the efficiency of the transmission by using

nominal π method?

[8M]

4 a) Explain about the equivalent ‘π ’model of a long transmission line? [8M]

b) A 3 phase 200km long transmission line has the following constants. Resistance

/ph/km is 0.15ohm, reactance/ph/km is 0.22 ohms, and the shunt admittance/ph/km

is 1.4*10-6

mho. Calculate by rigorous method the sending end voltage and current

when the line is delivering a load of 20MW at 0.75 lagging power factor. The

receiving end voltage is 110kv?

[8M]

5 a) Explain the transient behavior of a line when it is open circuited at the receiving

end?

[8M]

b) A rectangular wave travels along a 500km line terminated with a resistance of

1000 ohms. The line has a resistance of 0.32 ohm/km and surge impedance of 400

ohm. If the voltage at the termination point after two successive reflections is

200kv. Find the amplitude of the incoming surge?

[8M]

6 a) What is meant by Ferranti effect and prove it in a transmission line? [8M]

b) Explain about the effect of radio interference due to corona on the transmission

lines?

[8M]

7 a) Explain briefly about the string efficiency improvement methods? [8M]

b) Discuss the effect of wind and ice on the sag calculation of a transmission line? [8M]

*****

R13 SET - 2

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Code No: RT31023







~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

PART –A

1 a) Explain the importance of a bundled conductor? [4M]

b) Discuss why the capacitance is neglected in short transmission lines? [3M]

c) Write the expression for the incident voltage wave of a long transmission line? [3M]

d) What is meant by reflected voltage wave of a long transmission line? [4M]

e) Write short notes on the radio interference due to corona? [4M]

f) Discuss how the wind is affecting the weight of the conductor? [4M]

PART -B

2 a) Derive the expression for the capacitance of a transposed unsymmetrical 3 phase

system?

[8M]

b) Derive the expression for the capacitance of a conductor in a double circuit

hexagonal spaced three phase system?

[8M]

3 a) Derive the A, B, C, D constants of a symmetrical medium transmission line. [8M]

b) A three phase short transmission line has resistance and reactance per phase as 4.5

ohms and 6.7 ohms respectively. The sending end and receiving end voltages are

11kv and 100kv respectively, for some receiving end load at 0.8 power factor

lagging calculate the output power, sending end power factor and the efficiency of

the line?

[8M]

4 a) Explain about the equivalent ‘T’ model of a long transmission line? [8M]

b) A 3 phase 50Hz, 180km long transmission line has three conductors each of 0.6cm

radius, spaced at the corners of an equilateral triangle of side 4m. the resistance of

each conductor is 0.2 ohm/km and the line delivers 20MVA at 110kv at 0.85

lagging power factor, then find the A,B,C,D constants , sending end voltage and

current , efficiency, regulation of the line?

[8M]

5 a) Explain the transient behavior of a line when it is short circuited at the receiving

end?

[8M]

b) A cable has a conductor of radius 0.77cm and the sheath of inner radius 2.5cm. find

the inductance per meter length , the capacitance per meter length, surge impedance

and the velocity of propagation if the permittivity of the insulation is 4?

[8M]

6 a) What are the various methods that are used for power factor improvement? [8M]

b) Explain about the importance of critical voltage and power loss due to corona? [8M]

7 a) Explain the importance of stringing chart and give its advantages. [8M]

b) Explain how the string efficiency can be improved by using the guard ring? [8M]

*****

R13 SET - 3

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Code No: RT31023







~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

PART –A

1 a) What are the Differences between bundled and stranded conductors? [4M]

b) What are the Differences between long and medium transmission lines? [4M]

c) What is meant by surge impedance loading? [3M]

d) What is meant by a travelling wave? [3M]

e) What are the disadvantages of low power factor? [4M]

f) Discuss how the ice formation is affecting the weight of the conductor? [4M]

PART -B

2 a) Derive the expression for the capacitance of a three phase line? [8M]

b) Calculate the loop inductance of a single phase line with two parallel conductors

spaced 3.7m apart. The diameter of each conductor is 1.5m?

[8M]

3 a) Analyze a short transmission line with the help of phasor diagram? [8M]

b) A 220kv 50Hz 3 phase transmission line is 56km long. The resistance per phase is

0.14 ohms/km, the inductance per phase is 1.32mH/km and the shunt capacitance is

negligible. Use the short line model to find the voltage and power at the sending end,

voltage regulation and efficiency when the line is supplying a 3 phase load of

400MVA, 220kv at 0.7 power factor lagging?

[8M]

4 a) Evaluate the A, B, C, D constants of a long transmission line by equivalent ‘T’

network?

[8M]

b) List the factors that are considered for along transmission line with respect to short

and medium lines.

[8M]

5 a) What are the various types of power system transients? Explain. [8M]

b) Explain the transient behavior of a line when it is connected to a cable?

[8M]

6 a) Explain about the effect of charging current on the regulation of a transmission line? [8M]

b) Discuss about the shunt capacitive compensation with phasor diagram?

[8M]

7 a) Derive the expression for sag of a transmission line between two supports of equal

heights?

[8M]

b) Explain how the string efficiency can be improved by grading of insulators? [8M]

*****

R13 SET - 4

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Code No: RT31033

III B. Tech I Semester Regular/Supplementary Examinations October/November - 2016

DESIGN OF MACHINE MEMBERS – I

(Mechanical Engineering)




3. Answer any THREE Questions from Part-B (Data books may be allowed)

*****

PART –A

1 a) What are the general considerations in designing a machine component? [3M]

b) Explain the modified Goodman diagram for torsional shear stresses. [4M]

c) Explain the various ways in which a riveted joint may fail. [4M]

d) Draw any three keys with neat sketches. [3M]

e) Write the design procedure for muff coupling. [4M]

f) Write briefly about the helical torsion springs with a neat sketch. [4M]

PART -B

2 a) Explain briefly the design considerations of welded assemblies. [6M]

b) Explain briefly the various theory of failures.

[10M]

3 a) Explain the modified Goodman diagram for bending stresses. [6M]

b) A transmission shaft of cold drawn steel 27Mn2 (Sut = 500 N/mm2 and

Syt = 30N/mm2) is subjected to a fluctuating torque which varies from -100 N-m

to +400 N-m. The factor of safety is 2 and the expected reliability is 0%.

Neglecting the effect of stress concentration, determine the diameter of the shaft.

Assume the distortion energy theory of failure.

[10M]

4 a) Explain the design procedure for the eccentrically loaded bolted joint. [6M]

b) Design a double riveted butt joint with two cover plates for the longitudinal seam

of a boiler shell 1.5 m in diameter subjected to a steam pressure of 0.95 N/mm2.

Assume joint efficiency as 75%, allowable tensile stress in the plate 90MPa,

compressive stress 140 MPa and shear stress in the rivet is 56 MPa.

[10M]

5 a) A shaft, 40 mm in diameter is transmitting 35 KW power at 300 rpm by means of

Kennedy keys of 10X10 mm cross section. The keys are made of steel 45C8

(Syt = Syc = 380 N/mm2) and the factor of safety is 3.Determine the required

length of the keys.

[6M]

b) Design a sleeve and cotter joint to resist a tensile load of 60 KN. All parts of the

joint are made of the same material with the following allowable stresses.

σt = 60 MPa , τ = 70 MPa and σc =125 MPa.

1 of 2

[10M]

R13 SET - 1

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6 a) Explain the design procedure for flexible coupling. [6M]

b) Design a Cast Iron flange coupling for a steel shaft transmitting 15 KW at 200 rpm

and having an allowable shear stress of 40 MPa. The working stress in the bolts

should not exceed 30 MPa. Assume that the same material is used for shaft and

key and that the crushing stress is twice the value of its shear stress. The maximum

torque is 25 % greater than the full load torque. The shear stress for Cast Iron is 14

MPa.

[10M]

7 a) Design a helical spring for a spring loaded safety valve for the following

conditions:

Diameter of valve seat = 65 mm, operating pressure = 0.7 N/mm2, Maximum

pressure when the valve blows off freely = 0.75 N/mm2, Maximum lift of the

valve when the pressure rises from 0.7 to 0.75 N/mm2 = 3.5 mm, Maximum

allowable stress = 550 MPa, Modulus of rigidity = 84 KN/mm2, Spring index = 6.

[10M]

b) A truck spring has 12 number of leaves, two of which are full length leaves. The

spring supports are 1.05 m apart and the central band is 85 mm wide. The central

load is to be 5.4 KN with a permissible stress of 280 MPa. Determine the

thickness and width of the steel spring leaves. The ratio of the total depth to the

width of the spring is 3.Also determine the deflection of the spring.

[6M]

-000-

2 of 2

R13 SET - 1 Code No: RT31033

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Code No: RT31033








*****

PART –A

1 a) What is Standardization? Give examples of Indian Standards for engineering

materials.

[3M]

b) Explain briefly about the causes of stress concentration. [4M]

c) Discuss about the bolts of uniform strength. [4M]

d) Explain briefly about the design of flat and square keys. [3M]

e) What are the differences between Rigid couplings and Flexible couplings? [4M]

f) Explain briefly about the stresses and deflection in Coaxial springs. [4M]

PART -B

2 a) What are the manufacturing considerations in the design of Castings? [6M]

b) A manufacturer is interested to start his business with five different models of

tractors ranging from 7.5 to 75 KW capacities. Specify power capacities of models.

There is an expansion plan to further increase the number of models from five to

nine to fulfill the requirements of the farmers. Specify the power capacities of

additional models.

[10M]

3 a) Explain briefly about Soderberg and Goodman lines with neat sketches. [6M]

b) A circular bar of 500 mm length is supported freely at its two ends. It is acted upon

by a central concentrated cyclic load having a minimum value of 20 KN and a

maximum value of 50 KN. Determine the diameter of bar by taking a factor of

safety of 1.5, size effect of 0.85, surface finish factor of 0.9.The material properties

of bar are given by : Ultimate strength of 650 MPa, yield strength of 500 MPa and

endurance strength of 350 MPa.

[10M]

4 a) Explain the design procedure for the socket and spigot joint. [8M]

b) A circular steel bar 50 mm diameter and 200 mm long is welded perpendicularly to

a steel plate to form a cantilever to be loaded with 5KN at the free end. Determine

the size of the weld, assuming the allowable stress in the weld is 100 MPa.

[8M]

5 a) Explain briefly about the design of shafts subjected to combined bending and

torsion.

1 of 2

[6M]

R13 SET - 2

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b) A line shaft is to transmit 30 KW at 160 rpm. It is driven by a motor placed directly

under it by means of a belt running on a 1m diameter pulley keyed to the end of the

shaft. The tension in the tight side of the belt is 2.5 times that of the slack side and

the centre of pulley overhangs 150 mm beyond the centre line of the end bearing.

Determine the diameter of the shaft, if the allowable shear stress is 56MPa and the

pulley weighs 1600 N.

[10M]

6 a) Explain about the design of Bushed pin flexible coupling with a neat sketch. [8M]

b) Design a Cast Iron flange coupling for a mild steel shaft transmitting 90 KW at

250 rpm. The allowable shear stress in the shaft is 40 MPa and the angle of twist is

not to exceed 10 in a length of 20 diameters. The allowable shear stress in the

coupling bolts is 30 MPa.

[8M]

7 a) Explain the stresses and deflection in leaf springs with a neat sketch. [6M]

b) A helical compression spring made of oil tempered carbon steel, is subjected to a

load which varies from 400 N to 1000 N. The spring index is 6 and the design factor

of safety is 1.25.If the yield stress in shear is 770 MPa and endurance stress in shear

is 350MPa. Find: 1) Size of the spring wire 2) Diameters of the spring 3) Number of

turns of the spring and 4) Free length of the spring. The compression of the spring at

the maximum load is 30 mm. The modulus of rigidity for the spring material may be

taken as 80 kN/mm2.

[10M]

-000-

2 of 2


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Code No: RT31033








*****

PART –A

1 a) Explain about the different types of fits. [3M]

b) Explain about static strength design based on fracture toughness. [4M]

c) Draw the S-N curve for ferrous and nonferrous components. [4M]

d) Discuss briefly about the bolts of uniform strength. [3M]

e) Explain briefly about the design of flat and square keys. [4M]

f) Explain briefly about the stresses and deflection in helical compression springs. [4M]

PART -B

2 a) Explain briefly about the preferred numbers. [6M]

b) A cantilever cold drawn steel bar 20 mm diameter and 100 mm length is loaded by

a transverse force of 0.55 kN, an axial load of 8 kN and a torque of 30 Nm. The

yield tensile and compressive strength are 165 MPa and 190MPa.Compute factor of

safety based on Maximum shear stress theory and Maximum distortion energy

theory.

[10M]

3 a) Explain briefly the design of welded joints subjected to twisting moment and the

bending moment.

[6M]

b) A circular shaft, 75 mm in diameter, is welded to the support by means of a

circumferential fillet weld. It is subjected to a torsional moment of 3000 N-m.

Determine the size of the weld, if the maximum shear stress in the weld is not to

exceed 70 N/mm2.

[10M]

4 a) Design a Knuckle joint to transmit 150 kN. The design stresses may be taken as

75 MPa in tension, 60 MPa in shear and 150 MPa in compression.

[10M]

b) Explain briefly a design of shafts subjected to combined bending and torsion.

[6M]

5 a) Draw the Gerber curve, Goodman and Soderberg lines with neat sketch and

explain its significance.

[6M]

b) A solid circular shaft made of steel Fe620 (Sut = 620 N/mm2 and Syt = 380 N/mm

2)

is subjected to an alternating torsional moment, that varies from -200N-m to

+400 N-m. The shaft is ground and the expected reliability is 90%. Neglecting the

stress concentration, Calculate the shaft diameter for infinite life. The factor of

safety is 2.Use the distortion energy theory of failure.

1 of 2

[10M]

R13 SET - 3

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6 a) Explain the design procedure for Muff Coupling. [6M]

b) Design a Cast Iron flange coupling for a mild steel shaft transmitting 90 KW at 250

rpm. The allowable shear stress in the shaft is 40 MPa and the angle of twist is not

to exceed 10 in a length of 20 diameters. The allowable shear stress in the coupling

bolts is 30 MPa.

[10M]

7 a) Explain the construction of Multi leaf spring with a neat sketch. [6M]

b) A safety valve of 60 mm diameter is to blow off at a pressure of 1.2 N/mm2.It is

held on its seat by a closely coiled helical spring. The maximum lift of the sleeve is

10 mm. Design a suitable compression spring of spring index 5 and providing an

initial compression of 35 mm. The maximum shear stress in the material of the wire

is limited to 500 MPa. The modulus of rigidity for the spring material is 80

KN/mm3.Calculate: 1.Diameter of the spring wire 2.Mean diameter 3.Number of

active turns and 4.Pitch of the coil.

Take Wahl’s factor = (4C – 1)/(4C-4) + 0.615/C, where C is the spring index.

[10M]

-000-

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Code No: RT31033








*****

PART –A

1 a) Discuss the factors influencing the selection of materials for machine elements. [3M]

b) Define the term stress concentration and What are the causes of stress concentration? [4M]

c) List out the various failures of the riveted joint and how do you classify the riveted

joints?

[4M]

d) How do you design the solid and hollow shafts based on strength and rigidity? [3M]

e) What are the requirements of a good Coupling? [4M]

f) How do you design the helical compression springs for fatigue loading? [4M]

PART -B

2 a) Explain briefly about the torsional and bending stresses in the design of machine

elements.

[4M]

b) A cylindrical shaft made of steel of yield strength 700 MPa is subjected to static loads

consisting of bending moment 10kN-m and a torsional moment of 30kN-m.

Determine the diameter of shaft using all theories of failure and assuming a factor of

safety of 2. Take E = 210 GPa and Poisson’s ratio = 0.25.

[12M]

3 a) Estimate the factors that affect the fatigue strength. [6M]

b) A simply supported beam has a point load at the centre which fluctuates from a value

F to 4F. Length of beam is 500 mm and cross section is circular with a diameter of 60

mm. Ultimate, yield stresses are 700 MPa and 500 MPa respectively. Endurance limit

in reverse bending is 330 MPa. Factor of safety desired is 1.3.Assume size factor 0.83,

Surface finish factor 0.9, reliability factor 1.0.Find the maximum value of F.

[10M]

4 a) What are the advantages and disadvantages of welded joints? [6M]

b) A 65 mm diameter solid shaft is to be welded to a flat plate by a fillet weld around the

circumference of the shaft. Determine the size of the weld if the torque on the shaft is

3 kNm and the allowable shear stress in the weld is 70 MPa.

[10M]

5 a) Write the design procedure for Jib and Cotter joint for square rods. [6M]

b) A mild steel shaft transmits 20 KW at 200 rpm. It carries a central load of 900 N and

is simply supported between the bearings 2.5 m apart. Determine the size of the shaft,

if the allowable shear stress is 42 MPa and the maximum tensile or compressive stress

is not to exceed 56 MPa. What size of the shaft will be required, if it is subjected to

gradually applied loads?

1 of 2

[10M]

R13 SET - 4

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6 a) Write the design procedure for a flexible coupling [6M]

b) Design a Muff coupling which is used to connect two steel shafts transmitting 40 KW

at 350 rpm. The material for the shaft and key is plain carbon steel for which

allowable shear and crushing stresses may be taken as 40MPa and 80MPa

respectively. The material for the muff is cast iron for which the allowable shear stress

may be assumed as 15MPa.

[10M]

7 a) Explain the design of helical compression springs with a neat sketch. [8M]

b) A rail wagon of mass 20 tonnes is moving with a velocity of 2 m/s. It is brought to rest

by two buffers with springs of 300 mm diameter. The maximum deflection of springs

is 250 mm. The allowable shear stress in the spring material is 600 MPa. Design the

springs for the buffers.

[8M]

-000-

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Code No: RT31043


CONTROL SYSTEMS (Comm to ECE and EIE )





(Normal and semi & polar graph sheet are the supplied) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

PART –A

1 a) Define a control system. Explain about open-loop and closed-loop control systems. [3M]

b) Derive the transfer function of Armature controlled DC servo motor. [4M]

c) Define the error constants Kp, Kv and Ka. [4M]

d) Explain about the effects of adding zeroes to G(s)H(s) on the root loci. [3M]

e) Define various Frequency domain specifications [4M]

f) Explain about Lead compensator. [4M]

PART -B

2 a) What are the effects of feedback on Sensitivity and external noise? [8M]

b) Find transfer function θ(s)/T(s).

[8M]

3 a) Explain related terms used in Mason’s gain formula with examples. [8M]

b) Draw the equivalent signal flow graph and determine

( )

( )

C S

R S using Mason’s gain

formula.

[8M]

4 a) Derive the response of a standard under damped second order system for unit step

input.

[8M]

b) A unity feed back system has an open-loop transfer function ( )( 10)

KG SS S

=+

.

Determine K so that the system will have a damping ratio 0.5. For this value of K,

determine peak over shoot and time for peak over shoot for the unit step input.

1 of 2

[8M]

R13 SET - 1

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Code No: RT31043

5 a) What are rules in construction of root loci ? [6M]

b) For a unity feed back system with open loop transfer function

Find the range of K for which the system will be

stable using RH – Criterion.

[10M]

6 a) Find the Gain margin and phase margin of the system if the open loop transfer function

is : )1(

10)(

+=

SSSG

[8M]

b) Draw the polar plot of G(S) H(S)

( 3)( 5)

K

S S S=

+ +and there from determine

range of K for stability using Nyquist Criterion.

[8M]

7 a) A system is characterized by the following state space equations.

.

1 1

.2

2

1

2

3 1 0; 0

2 0 1

[1 0]

XXu t

XX

Xy

X

− = + > −

=

Find the transfer function of the system.

Compute the state transition matrix.

Solve the state equation for the unit step input under zero initial conditions.

[16M]

Note: SET-1 needs ordinary graph sheets.

*****

2 of 2

R13 SET - 1

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Code No: RT31043








PART –A

1 a) Write the advantages and disadvantages of open-loop and closed-loop control

systems.

[3M]

b) Explain about Mason’s gain formula. [4M]

c) Write short notes on steady state error. [4M]

d) What are effects of adding poles to G(s)H(s) on the root loci ? [3M]

e) Explain about Phase Margin and Gain Margin. [4M]

f) What are the properties of State Transition Matrix? [4M]

PART -B

2 a) Discuss the effect of feedback on Gain, Stability. [8M]

b) Determine the transfer function 2 ( )

( )

X S

F S.

[8M]

3 a) Explain the construction and operation of AC servomotor . [8M]

b) Obtain the transfer function C(s)/R(s) by using Block diagram algebra.

1 of 2

[8M]

R13 SET - 2

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Code No: RT31043

4 a) Derive the expressions for peak time and settling time of a standard second order

under damped system.

[8M]

b) Determine the step, ramp & parabolic error constants for the following system with

unity feedback. ))1(

)(2

+=

ss

KsG

[8M]

5 a) Find the stability of the system whose characteristic equation is given by

P(s) = s6+2s

5+8s

4+12s

3+20s

2+16s+16.

[8M]

b) Sketch the root locus of the system whose open loop transfer function is

G(s)H(s)= . find the value of k for damping ratio of 0.5

[8M]

6 a) The open loop transfer function of a unity feedback system is given by

draw the bode plot, find the gain margin and phase

margin and comment on stability by bode plot.

[16M]

7 a) Diogonalize the system matrix,

[8M]

b) Test the system represented by following equations is state controllable and

observable.

[ ] [ ] [ ]

=

+

−

−=

2

101,

1

3

10

02

x

xyuxX

[8M]

Note: SET-2 needs ordinary graph sheets and semi-log graph sheets.

*****

2 of 2

R13 SET - 2

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Code No: RT31043








PART –A

1 a) Compare the open-loop and closed-loop control systems. [3M]

b) Derive the transfer function for AC servomotor. [4M]

c) Derive the response of a standard first order system for unit step input. [4M]

d) What are limitations of Routh’s stability criterion? [3M]

e) What is polar plot? Draw the polar plot of G(s)=1/(1+ST) [4M]

f) Explain about Lag compensator. [4M]

PART -B

2 a) Explain about the classification of control systems. [8M]

b) Obtain the transfer functions Eo(s)/Ei(s) of the bridged T network

[8M]

3 a) Explain the construction and operation of Synchro transmitter and Receiver [8M]

b) Find transfer function C(s)/R(s).

1 of 2

[8M]

R13 SET - 3

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Code No: RT31043

4 a) Explain about the PID controller. [8M]

b) For a unity feedback system the open loop transfer function is .

Find the positional , velocity and acceleration error constants .

Find also steady state error when the input is .

[8M]

5 a) A unity feed back system with forward path transfer function

oscillates with frequency 2 rad/ sec . Find values

of K and p

[8M]

b) Sketch the root locus of the system whose open loop transfer function is

G(s)= . find the value of k for damping ratio of 0.5

[8M]

6 Consider a unity feedback system having an open loop transfer function

sketch the Bode plot and determine

the value of ‘k’ so that gain margin is 20 db and phase margin is 300.

[16M]

7 a) What are the advantages of state model representation? [4M]

b) [ ] [ ] uxX

+

−−=

1

0

21

10 , with initial conditions

. Calculate STM, complete solution x(t) and y(t).

[12M]


*****

2 of 2

R13 SET - 3

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Code No: RT31043







(Normal and semi & polar graph sheet are the supplied)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

PART –A

1 a) Explain about the negative feed back of loop with examples. [3M]

b) Derive the transfer function of field controlled DC servo motor. [4M]

c) What are Standard test signals? [4M]

d) Explain about Routh’s stability criterion. [3M]

e) What is Bode plot? Draw the Bode plot of G(s)=1/(1+ST) [4M]

f) Explain about Lead-Lag compensator. [4M]

PART -B

2 a) Obtain transfer function X1(s)/U(s).

[8M]

b) Obtain the transfer function Eo(s)/Ei(s). (Capacitors C1 and C2 are not charged

initially.)

[8M]

3 a) Derive the transfer function C(s)/R(s) for the following diagram by using block

diagram reduction technique.

1 of 2

[8M]

R13 SET - 4

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Code No: RT31043

b) Find transfer function C(s)/R(s).

[8M]

4 a) Explain about PIDl controller. [8M]

b) Determine the values of ‘K’ and ‘a’ such that the damping factor is 0.6 and a

settling time of 1.67 sec. Also find the step response of the system.

[8M]

5 Sketch the root locus diagram for the following open loop transfer function:

)204)(4()(

2+++

=SSSS

KSG

[16M]

6 a) Draw the bode plot of .Find Gain Margin &

Phase Margin.

[8M]

b) Draw the Nyquist plot of and there from

determine range of K for stability using Nyquist Criterion.

[8M]

7 a) Obtain the state model of the system whose transfer function is given as

[6M]

b) Define controllability and observability. Find controllability and observability of the

given system

[10M]


*****

2 of 2

R13 SET - 4

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Code No: RT31053


PRINCIPLES OF PROGRAMMING LANGUAGES

(Computer Science and Engineering)





*****

PART –A

1 a) Define Left Recursive Grammar Rule. [4M]

b) Define Binding and Binding Time. [3M]

c) Which languages allow variable number of parameters? [3M]

d) What is an overriding method? [4M]

e) What data types were parts of original LISP? [4M]

f) What are two parts of a compound term? [4M]

PART -B

2 Using this grammar <assign><id>=<expr>

<id>A|B|C

<expr><id>+<expr>|<id>*<expr>| (<expr>)|<id>

Show parse tree and Left most derivation for following:

(a) A= (A+B)*C (b) A=B*(C*(A+B))

[16M]

3 a) Define name and structure type compatibility. What are relative merits of these

two?

[8M]

b) Define Coercion, Typeerror, Typechecking and Strong Typing.

[8M]

4 a) Explain design issues of functions. [6M]

b) Explain about Co-Routines with an example.

[10M]

5 a) What is Co-Operation Synchronization? [6M]

b) Implement Producer and Consumer problem using Semaphores. [10M]

6 a) Explain about data objects in LISP. [12M]

b) Write factorial function using COMMON LISP. [4M]

7 a) Explain Inferencing process of PROLOG. [10M]

b) Write differences between procedural and non-procedural languages. [6M]

-000-

R13 SET - 1

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Code No: RT31053








*****

PART –A

1 a) Define Lexeme and Token. [3M]

b) Define row major order and column major order in arrays. [3M]

c) Write differences between function and procedure. [4M]

d) Briefly describe advantage of monitor over semaphores. [4M]

e) Write difference between EQ and EQV. [4M]

f) What are forms of Horn Clauses? [4M]

PART -B

2 a) Prove that the following grammar is ambiguous

<S> <A>

<A><A>+<A>|<id>

<id>-a|b|c

[8M]

b) What is primary use of attribute grammar?

[8M]

3 a) Explain Categories of Arrays. [8M]

b) Explain Array Operations. [8M]

4 Explain different parameter passing methods with an example.

[16M]

5 a) Explain Thread class in JAVA and its methods. [10M]

b) Explain how concurrency is provided in ML.

[6M]

6 a) Explain about Predicate functions in Scheme. [8M]

b) How functions are defined in Scheme?

[8M]

7 a) Explain about fact and rule statements in PROLOG [8M]

b) Explain how backtracking works in PROLOG [8M]

-000-

R13 SET - 2

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Code No: RT31053








*****

PART –A

1 a) Draw Parse tree for expression a=b/ (a+c). [3M]

b) Define narrowing and widening conversions. [3M]

c) What is parameter profile? [4M]

d) Write differences between logical and physical concurrency. [4M]

e) What does a lambda expression specify? [4M]

f) What are three forms of PROLOG Term? [4M]

PART -B

2 a) Describe purpose of ACTION and GOTO table in an LR Parser with example. [10M]

b) Describe differences between Top-Down and Bottom-Up Parsers.

[6M]

3 a) What is mixed mode assignment? Explain mixed mode assignments in Ada,

Java and ML.

[10M]

b) Explain structure of an associative array.

[6M]

4 a) What is an overloaded subprogram? Explain with an example. [8M]

b) Explain two methods for implementing blocks.

[8M]

5 What is exception handling? How exceptions are handled in C++ and JAVA.

[16M]

6 a) Explain about list functions in Scheme. [8M]

b) Explain about primitive functions in Scheme.

[8M]

7 a) Write deficiencies of PROLOG. [10M]

b) Explain generate and test programming strategy in PROLOG. [6M]

-000-

R13 SET - 3

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Code No: RT31053








*****

PART –A

1 a) What is primary task of a Lexical Analyzer? [3M]

b) What are design issues of Two-Way Selection Statement? [3M]

c) Define scope and Lifetime. [4M]

d) Explain wait () and release () methods of semaphores. [4M]

e) What are antecedents and consequents? [4M]

f) What are two forms of DEFINE? [4M]

PART -B

2 Perform Pair wise disjointness test for following rules:

AaB|b|cBB

BaB|bA|aBb

C-aaA|b|caB

[16M]

3 a) Explain advantages and disadvantages of Java for loop compared to Ada for

loop.

[8M]

b) Explain about Guarded Command

[8M]

4 Describe deep access and shallow access methods for implementing dynamic

scoping.

[16M]

5 a) Explain features of Object-Oriented Programming Languages. [6M]

b) Explain how Ada supports concurrency.

[10M]

6 Explain how functions are defined in Scheme and ML.

[16M]

7 Explain list structures and Goal statements in PROLOG. [16M]

-000-

R13 SET - 4

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III B.Tech I Semester Supplementary Examinations, October/November - 2016

POWER SYSTEMS- II

(Electrical and Electronics Engineering)


Answer any FIVE Questions

All Questions carry equal marks

*****

1 a) Derive the expression for calculating the internal and external flux linkages for a

conductor carrying current. Use this extension to derive the equation for the inductance of

a single phase line.

[8M]

b) Calculate the capacitance of a single-phase overhead line consisting of a pair of parallel

wires 12mm in diameter and spaced uniformly 2.5 m apart. If the line is 30 km long and

its one end is connected to 50 kV, 50 Hz system, what will be charging current when the

other end is open circuited?

[7M]

2 a) Draw the phasor diagram of a short transmission line and derive an expression for voltage

regulation.

[7M]

b) A single-phase transmission line 100 km long has the constants: Resistance per km is

0.4Ω, reactance per km is 0.6Ω, admittance per km 14 micro mhos, and receiving-end

voltage is 33 kV. Assuming that the total capacitance of line is localized at the receiving-

end, determine (i)sending-end current, (ii)sending-end voltage, (iii) regulation,

(iv) efficiency and (v) supply power factor if the line is delivering 5 MW at 0.8 p.f

lagging.

[8M]

3 a) Discuss the wave length and velocity of propagation of waves in long lines [7M]

b) A three – phase overhead transmission line has series impedance per phase of 150 080∠

ohms and a total shunt admittance of 0.001 090∠ siemen per phase. The line delivers a

load of 150MW at 0.707 pf lagging and 220kV between the lines. Calculate the sending-

end voltage and current by the rigorous method.

[8M]

4 a) Define surge impedance of a line. Obtain the expressions for voltage and current waves at

a junction or at a transition point.

[8M]

b) The ends of two long transmission lines, A and C are connected by a cable B, 1km long.

The surge impedances of A, B, C are 400, 50 and 500 ohms respectively. A rectangular

voltage wave of 25 kV magnitude and of infinite length is initiated in A and travels to C.

Determine the first and second voltages impressed on C.

[7M]

5 a) Discuss the charging current in the transmission lines [7M]

b) A single-phase transmission line consists of two conductors of diameter 1.2 cm each, with

1.5 meter spacing between centers. Determine the value of the line voltage at which

corona commence, if the disruptive critical voltage for air is 21.21 kV/cm.

1 of 2

[8M]

Code No: R31023 Set No. 1 R10

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6 a) Explain why suspension insulators are preferred for high voltage transmission lines. What

is a strain insulator and where is it used?

[7M]

b) A string insulator consists of five units. The capacitance from each joint to tower is 12

% of the capacitance of each unit. Determine the voltage across the lowest unit as

percentage of the total voltage. Also calculate string efficiency.

[8M]

7 a) Derive an equation to calculate the conductor tension under erection conditions if the

conductor tension and loading under bad weather conditions are known.

[7M]

b) Two towers of height 40 and 90 meters respectively support a transmission line conductor

at a water crossing. The horizontal distance between the towers is 500 m. If the allowable

tension in the conductor is 1600kg, find the minimum clearance of the conductor and the

clearance of the conductor mid-way between the supports. Weight of the conductor is

1.1kg/m. Bases of the towers can be considered to be at the water level.

[8M]

8 a) Explain the use of static capacitors for improvement of power factor. [7M]

b) A single circuit 3-phase 220kV line runs at no load. Voltage at the receiving end of

the line is 210kV. Find the sending end voltage, if the line has resistance 20.5 ohms,

reactance of 81.3 ohms and the total susceptance as 5.45×10-6

mho.The transmission line

is to be represented by π-model.

[8M]

-000-

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DYNAMICS OF MACHINERY (Common to ME, AME)




*****

1 a) What is the effect of the gyroscopic couple on the stability of a four wheeler while

negotiating a curve? In what way does this affect along with that of the centrifugal

force limit the speed of the vehicle?

[7M]

b) The moment of inertia of an aeroplane air screw is 20 kg-m2 and the speed of rotation

is 1000 rpm clockwise when viewed from the front. The speed of the flight is 200 km

per hour. Find the gyroscopic reaction of the air screw on the aeroplane when it

makes a left handed turn on a path of 150 m radius.

[8M]

2 The thrust on the propeller shaft of a marine engine is taken by 8 collars whose

external and internal diameters are 650 mm and 400 mm respectively. The thrust

pressure is 0.5 MPa and may be assumed uniform. The coefficient of friction

between the shaft and collars is 0.04. If the shaft rotates at 120 rpm, find: a) The total

thrust on the collars, and b) The power absorbed by friction at the bearing.

[15M]

3 a) What are the various types of brakes? Describe briefly. [5M]

b) A Centrifugal clutch has 4 shoes which slide radially in a spider keyed to the driving

shaft and make contact with internal cylindrical surface of a rim keyed to the driven

shaft. When the Clutch is at rest, each shoe is pulled against a stop by a spring so as

to leave a radial clearance of 5 mm between the shoe and the rim. The pull exerted by

the spring is then 500 N. The mass centre of shoe is 160 mm from the axis of the

clutch. If the internal diameter of the rim is 400 mm, the mass of each shoe is 8 kg,

the Stiffness of each Spring is 50 N/mm and the Coefficient of friction between the

shoe and the rim is 0.3, find the power transmitted by the Clutch at 500 rpm.

[10M]

4 a) Distinguish between the terms “Crank pin effort” and “Crank effort”, and derive the

expressions for these.

[7M]

b) An engine flywheel has mass of 6.5 tonnes, and the radius of gyration is 2 m. If the

maximum and minimum speeds are 120 rpm and 118 rpm respectively, find the

maximum fluctuation of energy.

[8M]

5 a) Derive an expression for the height of Proell governor? [5M]

b) In a governor of the Hartnell type, the mass of each ball is 1.5 kg and the lengths of

the vertical and horizontal arms of the bell crank lever are 100 mm and 50 mm

respectively. The fulcrum of the bell crank lever is at a distance of 90 mm from the

axis of rotation. The maximum and minimum radii of rotation of balls are 120 mm

and 80 mm and the corresponding equilibrium speeds are 325 and 300 rpm. Find the

Stiffness of the Spring and the equilibrium speed when the radius of rotation is 100

mm.

1 of 2

[10M]


|''|'||||''|''||'|||

6 a) Define and explain the term ‘Balancing of Rotating Masses’. What will be the harm

if the rotating parts of high speed engine are not properly balanced?

[7M]

b) A number of masses (say four masses) are attached to a shaft which is rotating at an

angular speed of ω rad/s. If all the masses are in the same plane, then describe the

analytical method of balancing these four masses by a single mass only.

[8M]

7 Three cylinders of an air compressor have their axes 1200

to one another and their

connecting rods are coupled to a single crank. The stroke is 12cm and the length of

each connecting rod 20cm. The mass of the reciprocating parts per cylinders is 2Kg.

Determine the maximum primary and secondary forces acting on the frame of the

compressor when running at 2500 rpm. Describe the method by which such forces

may be balanced?

[15M]

8 a) Explain about vibration isolation and transmissibility? [5M]

b) A shaft 50mm diameter and 3m long. It is simply supported at the ends and carries

three masses 100Kg, 120Kg and 80Kg at 1.0mm, 1.75m and 2.5m respectively from

the left support. Taking E=20GN/m2

. Find the frequency of transverse vibrations

using Rayleigh’s method.

[10M]

*****

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III B.Tech I Semester Supplementary Examinations, October - 2016

LINEAR IC APPLICATIONS

(Comm to ECE, EIE, BME and ECM)




*****

1 a) Explain the DC analysis of Dual input unbalanced output amplifier. [8M]

b) Explain the AC analysis of Single input-balanced output amplifier

[7M]

2 What is an Op-amp. Briefly explain the necessity and function of different stages of

an Op-amp with respect to its block schematic

[15M]

3 a) What are the basic requirements of an instrumentation amplifier and list out its

applications,

[8M]

b) Differentiate Inverting amplifier with Non-inverting amplifier

[7M]

4 Draw the circuit diagram of a Traingular wave Generator and explain its operation

[15M]

5 a) Compare Active filters with passive filters. [5M]

b) Draw the schematic of a second order High-pass filter and sketch the frequency

response

[10M]

6 a) Explain functional diagram of an IC555 timer [8M]

b) Draw the circuit of a Schimitt's trigger with one timer,one capacitor,2 resistors

[7M]

7 a) Explain the R2R ladder type D/A converter [8M]

b) Find out step size and analog output for 4 -bit R-2R ladder DAC,when input is 0 1

1 1 and 1 1 1 1,assume Vref=+5V.

[7M]

8 a) Explain the operation of a sample and hold amplifier [8M]

b) State the advantages and applications of sample and hold amlifier [7M]

-000-


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III B.Tech I Semester Supplementary Examinations, October/November – 2016

DYNAMICS OF MACHINERY

(Common to ME, AME & MINING ENGG)




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1 a) What is the effect of the gyroscopic couple on the stability of a four wheeler while

negotiating a curve? In what way does this affect along with that of the centrifugal

force limit the speed of the vehicle?

[8M]

b) The moment of inertia of an aeroplane air screw is 20 kg-m2 and the speed of rotation

is 1000 rpm clockwise when viewed from the front. The speed of the flight is 200 km

per hour. Find the gyroscopic reaction of the air screw on the aeroplane when it

makes a left handed turn on a path of 150 m radius.

[8M]

2 The thrust on the propeller shaft of a marine engine is taken by 8 collars whose

external and internal diameters are 650 mm and 400 mm respectively. The thrust

pressure is 0.5 MPa and may be assumed uniform. The coefficient of friction

between the shaft and collars is 0.04. If the shaft rotates at 120 rpm, find: a) The total

thrust on the collars, and b) The power absorbed by friction at the bearing.

[16M]

3 a) What are the various types of brakes? Describe briefly. [6M]

b) A Centrifugal clutch has 4 shoes which slide radially in a spider keyed to the driving

shaft and make contact with internal cylindrical surface of a rim keyed to the driven

shaft. When the Clutch is at rest, each shoe is pulled against a stop by a spring so as

to leave a radial clearance of 5 mm between the shoe and the rim. The pull exerted by

the spring is then 500 N. The mass centre of shoe is 160 mm from the axis of the

clutch. If the internal diameter of the rim is 400 mm, the mass of each shoe is 8 kg,

the Stiffness of each Spring is 50 N/mm and the Coefficient of friction between the

shoe and the rim is 0.3, find the power transmitted by the Clutch at 500 rpm.

[10M]

4 a) Distinguish between the terms “Crank pin effort” and “Crank effort”, and derive the

expressions for these.

[8M]

b) An engine flywheel has mass of 6.5 tonnes, and the radius of gyration is 2 m. If the

maximum and minimum speeds are 120 rpm and 118 rpm respectively, find the

maximum fluctuation of energy.

[8M]

5 a) Derive an expression for the height of Proell governor? [6M]

b) In a governor of the Hartnell type, the mass of each ball is 1.5 kg and the lengths of

the vertical and horizontal arms of the bell crank lever are 100 mm and 50 mm

respectively. The fulcrum of the bell crank lever is at a distance of 90 mm from the

axis of rotation. The maximum and minimum radii of rotation of balls are 120 mm

and 80 mm and the corresponding equilibrium speeds are 325 and 300 rpm. Find the

Stiffness of the Spring and the equilibrium speed when the radius of rotation is 100

mm.

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[10M]

Code No: V3116 Set No. 1 R07

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6 a) Define and explain the term ‘Balancing of Rotating Masses’. What will be the harm

if the rotating parts of high speed engine are not properly balanced?

[8M]

b) A number of masses (say four masses) are attached to a shaft which is rotating at an

angular speed of ω rad/s. If all the masses are in the same plane, then describe the

analytical method of balancing these four masses by a single mass only.

[8M]

7 Three cylinders of an air compressor have their axes 1200

to one another and their

connecting rods are coupled to a single crank. The stroke is 12cm and the length of

each connecting rod 20cm. The mass of the reciprocating parts per cylinders is 2Kg.

Determine the maximum primary and secondary forces acting on the frame of the

compressor when running at 2500 rpm. Describe the method by which such forces

may be balanced?

[16M]

8 a) Explain about vibration isolation and transmissibility? [6M]

b) A shaft 50mm diameter and 3m long. It is simply supported at the ends and carries

three masses 100Kg, 120Kg and 80Kg at 1.0mm, 1.75m and 2.5m respectively from

the left support. Taking E=20GN/m2

. Find the frequency of transverse vibrations

using Rayleigh’s method.

[10M]

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SOFTWARE TESTING METHODOLOGIES (Common to CSE and IT)




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1 a) Why is it impossible for a tester to find all the bugs in a system? Why might it

not be necessary for a program to be completely free of defects before it is

delivered to its customers?

b) Explain clearly the white - box tests and behavioral tests.

2 a) Explain clearly the single link marker path instrumentation with an example?

b) Explain the concatenated loops with an example. How do you convert a

flow-chart into a flow graph?

3 a) Distinguish between control flow and transaction flow?

b) Explain Births and mergers in Transaction?

4 a) Discuss in detail about testability of domains?

b) State and explain various restrictions that domain testing possesses.

5 a) Explain in brief about Flow-Anomaly Detection?

b) Explain Huang’s Theorem with an Example.

6 a) How can we form the specifications into the sentences? Write down the

different phrases which can be used for the words?

b) Explain about the ambiguities and contradictions in the specifications.

7 a) Define state. Explain about state table?

b) What are the types of bugs that can cause state graphs? Write Testers

comments about state graphs?

8 a) How can a relation matrix be represented and what are the properties of

relations?

b) Explain cross-term reduction and node-term reduction optimization.

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code no: rt31013 r13 set - 1 iii b. tech i semester regular ... bitsvizag/bits/exam...

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