Enroll. No. _____________

SILVER OAK COLLEGE OF ENGINEERING & TECHNOLOGY B.E. Semester- (III) - MID SEMESTER EXAMINATION (winter’14 Session)

SUBJECT: Engineering Thermodynamics (2131905)

Date: 14-10-2014 TIME: 11:00 A.M. to 12:30 P.M Total Marks: 40

Instructions: 1. Question one is compulsory. 2. Attempt any three from rest of the questions

3. Figures to the right indicate full marks. 4. Assume suitable data if required.

Q.1 (i) Which of the following is closed system? 01

a. Water Pump b. I.C. Engine c. Car Battery d. jet engine in flight (ii) Steady Flow Energy Equation of Throttling Process for ideal gas 01 a. h1=h2 b. C1=C2 c. u1=u2 d. None of Above (iii) The Efficiency of Carnot Cycle Engine depend on 01 a. Tmax & Tmin b. Quality of fuel c. Material of Engine d. Surrounding Pressure (iv) Second Law of Thermodynamics defines 01 a. Internal Energy b. Entropy c. Heat d. Work (v) Efficiency of Otto Cycle at Compression ratio is 8 01 a. 60.32% b. 56.47% c. 52.86% d. 61.42% (vi) In a Carnot Vapor Cycle phase of working fluid after condenser is 01 a. Liquid b. Steam/ Vapour c. Mixture of Liquid & Vapour d. All of The Above (vii) Equal Volumes of all perfect gases at the same temperature &

pressure contain same number of molecules it is statement of 01

a. Boyle’s Law b. Combined Gas Law c. Gibbs Dalton’s Law d. Avogadro’s Law Q.2 (a) Prove that Energy “ A Property of System” 04

(b) In a steam power cycle, the dry and saturated steam is supplied at 15 bar. If the Condenser pressure is 0.4 bar, calculate the Carnot and Rankine cycle Efficiencies neglecting the pump work.

07

Q.3 (a) A Heat Engine is operated between 800 0C and 40 0C. It Drives a heat pump which works between 120 0C and 40 0C. Efficiency and COP of the Heat Engine and the Heat Pump are half of that of corresponding Carnot values. Calculate amount of heat rejected by heat pump at 120 0C when 100 kJ is absorb by Heat Engine at 800 0C and Net heat transfer to the reservoir at 40 0C

07

04 (b) Write comparison of Carnot and Rankine cycle.

Q.4 (a) In a steam power station, steam flows steadily through a 0.2 m

diameter pipeline from the boiler to the turbine. At the boiler end, the

steam conditions are found to be: p= 4 MPa, t= 400 deg C, h= 3213.6

kJ/kg and v= 0.073 m3/kg. At the turbine end the condition are found

to be: p= 3.5 MPa, t=392 deg C, h= 3202.6 kJ/kg & v= 0.084 m3/kg.

There is a heat loss of 8.5 kJ/kg from the pipe line. Calculate the

steam flow rate.

05

06 (b) Explain P-V and T-s diagram for Diesel cycle. Derive the formula for the efficiency of the cycle.

Q.5 (a) Write down Vander wall’s equation of state. How does it differ from

ideal gas equation? 05

06 (b) An Air standard Otto cycle has a compression ratio of 8. At the start the compression process, the temperature is 260C and pressure is 1 bar. If the max temperature of the cycle is 10800 C. Calculate 1) The heat supplied per kg of air. 2) The thermal efficiency of the cycle.

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Enroll. No. _____________

SILVER OAK COLLEGE OF ENGINEERING & TECHNOLOGY

B.E. Semester- (III) - MID SEMESTEREXAMINATION (Winter’14 Session)

SUBJECT: KINEMATIC OF MACHINES (2131906)

Date:15-10-2014 TIME: 11:00 A.M. to 12:30 P.M Total Marks: 40

Instructions: 1. Question one is compulsory.

2. Attempt any three from rest of the questions

3. Figures to the right indicate full marks.

4. Assume suitable data if required.

Q.1 1. A kinematic chain is known as a mechanism when 01

(a) none of the links is fixed (b) one of the links is fixed

(c) two of the links are fixed (d) all of the links are fixed

2 The mechanism forms a structure, when the number of degrees of freedom

(n) is equal to

01

(a) 0 (b) 1 (c) 2 (d) – 1

3. Which of the following is an inversion of double slider crank chain? 01

(a) Coupling rod of a locomotive (b) Pendulum pump

(c) Elliptical trammels (d) Oscillating cylinder engine

4 The angle between the direction of the follower motion and a normal to the

pitch curve is called

01

(a) pitch angle (b) prime angle (c) base angle (d) pressure angle

5 A circle drawn with centre as the cam centre and radius equal to the distance

between the cam centre and the point on the pitch curve at which the pressure

angle is maximum, is called

01

(a) base circle (b) pitch circle (c) prime circle (d) none of these

6. Involute profile is preferred to cycloidal because 01

(a) the profile is easy to cut (b) only one curve is required to cut

(c) the rack has straight line

profile and hence can be cut

accurately

(d) none of the above

7. The synthesis of mechanism deals with 01

(a) the determination of input and

output angles of a mechanism

(b) the determination of dimensions

of the links in a mechanism

(c) the determination of

displacement, velocity and

acceleration of the links in a

mechanism

(d) none of the above

Q.2 (a) Define the following terms:

1. Link 2. Locked Chain 3. Higher Pair 4. Ternary Joint 5. Degrees of

freedom 6. Constrained Motion 7. Quaternary Link

7

(b)

Define the following terms as applied to cam with a neat sketch :-

(a)Base circle, (b) Pitch circle, (c) Pressure angle, and (d) Trace Point

4

Q.3 (a) A cam is to give the following motion to a knife-edged follower:

1. Outstroke during 60° of cam rotation; 2. Dwell for the next 30° of cam

rotation; 3. Return stroke during next 60° of cam rotation and 4. Dwell for the

remaining 210° of cam rotation.

The stroke of the follower is 40 mm and the minimum radius of the cam is 50

mm. The follower moves with uniform velocity during both the outstroke and

return strokes. Draw the profile of the cam when the axis of the follower

passes through the axis of the cam shaft,

7

(b) Sketch and describe the working of Beam Engine. 4

Q.4 (a) Derive an Expression for Length of Path of contact of Gears. 5

(b)

An epicyclic gear train as shown in fig. has a sun wheel S of 30 teeth and two

planet wheels P of 50 teeth. The planet wheel mesh with the internal teeth of

a fixed annular A. The driving shaft carrying the sun wheel transmits 4 KW

at 300 rpm. The driven shaft is connected to an arm which carries the planet

wheel. Determine the speed of the driven shaft.

6

Q.5 (a) Define:

i) Contact Ratio ii) Module iii) Circular Pitch

3

(b) Explain Function generation, Path generation and Motion generation. 3

(c) Determine the minimum number of teeth required on a pinion, in order to

avoid interference which is to gear with,

1. A wheel to give a gear ratio of 3 to 1 ; and 2. An equal wheel. The pressure

angle is 20° and a standard addendum of 1 module for the wheel may be

assumed.

5

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Enroll. No. _____________

SILVER OAK COLLEGE OF ENGINEERING & TECHNOLOGY

B.E. Semester- (III) - MID SEMESTER EXAMINATION (winter’14 Session)

SUBJECT: Mechanics of Solids (2130003)

Date: 10-10-2014 TIME: 11:00 A.M. to 12:45 P.M Total Marks: 40

Instructions: 1. Question one is compulsory.

2. Attempt any three from rest of the questions

3. Figures to the right indicate full marks.

4. Assume suitable data if required.

Q.1 (1) The unit of couple is

(a) kN (b) kN/m

(c) kN.m (d) kN/m2

01

(2)

(3)

(4)

(5)

(6)

The magnitude of the force of friction between two bodies , one lying above

the other depends upon the roughness of the

(a) upper body (b) lower body

(c) the body having more roughness (d) both the bodies

The principle of moment is based on

(a) Lami's theorem (b) principle of superposition

(c) varignon's theorem (d) all of the above

If the ends of a body yield, the magnitude of thermal stress will

(a) increase (b) decrease

(c) remain same (d) none of these

The C.G of a right circular cone of diameter (d) and height (h) lies at a

distance of___________ from the base along the vertical axis.

(a) h/6 (b) h/2

(c) h/3 (d) h/4

Moment of a triangle of base (b) and height (h) about axis passing through

C.G and parallel to the base is

(a) bh3/36 (b) bh

3/4

(c) bh3/12 (d) hb

3/12

Modulus of elasticity is the ratio of

01

01

01

01

01

(7) (a) stress to strain (b) force to cross-sectional area

(c) strain to stress (d) stress to original length

01

Q.2 (a) (1)What should be the value of θ in fig-1 which will make the motion of

1000N block down the plane to impend? The coefficient of friction for all

contact surfaces is 1/3.

(2) state laws of dry friction.

05

02

04 (b) A system of four forces shown in Fig. 2, has resultant 50 kN along + X –

axis.Determine magnitude and inclination of unknown force P.

Q.3 (a) (1) Determine magnitude, direction and perpendicular distance

from ‘O’ of the resultant for the force system shown in Fig. 3

(2) what must be the length of 5mm diameter aluminium wire so that

it can be twisted through one complete revolution without

exceeding a hearing stress of 42 MN/m2

. Modulus of rigidity(G) =

27 GN/m2

03

03

05

(b) Determine co-ordinates of centroid with respect to ‘O’ of the section shown

in fig- 4

Q.4 (a) (1) Write down the statement of parallel axis theorem and perpendicular axis

theorem.

(2) Write down the statement of pappus guildinus theorem of surface of

revolution and volume of solid.

(3) Enlist various types of loads and types of supports.

02

02

02

05 (b) A cord supported at A and B carries a load of 20kN at C and a load of W at

D as shown in fig-5. Find the value of W so that CD remains horizontal.

Q.5 (a) Determine the location of centroid and moment of inertia of the given lamina

in Fig-6 about centroidal X axis.

05

06

(b) A steel member ABCD with three different circular cross-section and

lengths as follows, is subjected to an axial pull of 150kN. Compute

the net change in the length of the member if the modulus of

elasticity (E)=200GPa.

AB: diameter=40mm and length=750mm

BC: diameter=25mm and length=1000mm

CD: diameter=30mm and length=1200mm

Fig-1 Fig-2 Fig-3

Fig-4 fig-5

Fig-6

Enroll. No. _____________

SILVER OAK COLLEGE OF ENGINEERING & TECHNOLOGY

B.E. Semester- (III) - MID SEMESTER EXAMINATION (Winter’14 Session)

SUBJECT: Manufacturing Process-I (2131903)

Date: 11-10-2014 TIME: 11:00 A.M. to 12:30 P.M Total Marks: 40

Instructions: 1. Question one is compulsory. 2. Attempt any three from rest of the questions

3. Figures to the right indicate full marks. 4. Assume suitable data if required.

Q.1 Answer the following Multiple Choice Questions.

07

1 Which of the following is not a type of tool material (a) Diamond (b) Tantalum (c) Ceramics (d) Cast Iron

2 Which of the following term is associated with Drilling (a) Arbor (b) Shank (c) Lead Screw (d) Feed Rod

3 The size of shaper is defined by (a) Floor Size (b) Maximum Stroke Length (c) Weight of Machine (d) Size of the work piece

4 The Size of planner is defined by (a) Floor Size (b) Maximum Stroke Length (c) Weight of the machine (d) Size of the work piece that can be machined

5 In milling machine, Cutter is mounted on (a) Indexing Plate (b) Table (c) Arbor (d) All of Above

6 Which of the following is single point cutting tool (a) Grinding Wheel

(b) Milling Cutter (c) Turning Tool (d) Drilling Tool

7 Which of the following is suitable for mass production of large size

cylindrical parts (a) Turret Lathe (b) Engine Lathe (c) Tool Room Lathe (d) Bench Lathe

Q.2 (a) Sketch and explain Basic parts of lathe machine. 06 (b)

Classification of basic machine tools.

05

Q.3 (a) Explain Operations performed on lathe machine.(Any Four) 06

(b)

Compare Centre lathe, Turret Lathe, Capstan Lathe.

05

Q.4 (a) Explain Nomenclature of Twist Drill 05

(b)

Why Flutes are provided in Twist Drill? Explain the application of Coolant.

03

(c) What is Indexing? Name Different Indexing methods. 03

Q.5 (a) Explain Up-milling and down-milling. List Merits and demerits of Up-

milling and down-milling.

05

(b) What is Quick Return Mechanism and also Explain hydraulic type of quick return mechanism.

06

***********************

Enroll. No. _____________

SILVER OAK COLLEGE OF ENGINEERING & TECHNOLOGY

B.E. Semester- (III) - MID SEMESTER EXAMINATION (Winter’14 Session)

SUBJECT: Material Science & Metallurgy (2131904)

Date:16-10-2014 TIME: 11:00 A.M. to 12:30 P.M Total Marks: 40

Instructions: 1. Questionone is compulsory. 2. Attempt any three from rest of the questions

3. Figures to the right indicate full marks. 4. Assume suitable data if required. 5. Draw suitable sketch if required.

Q.1 (i) Pearlite is made up of alternate layers of

a) Ferrite and Austenite b) Ferrite and Cementite c) Austenite and Cementite d) Ferrite and Bainite

01

(ii) Coordination number in simple cubic crystal structure is a) 14 b) 8 c) 2 d) 6

01

(iii) Rate of solidification depends upon a) Rate of nucleation b) Rate of growth c) Both (a & b) d) Rate of Cooling

01

(iv) Twinning deformation occurs due to a) Gradual loading b) Sudden loading c) Both (a & b) d) none of these

01

(v) A solid + liquid result in a solid upon cooling during …………reaction. a) Eutectic b) Peritectic c) Eutectoid d) none of these

01

(vi) Atomization process is used for a) Low melting point material b) High melting point Material c) Hard Material d) All of these

01

(vii) Repeatable entity of a crystal structure is known as a) Crystal b) lattice c) Unit cell d) Miller indices

01

Q.2 (a) Explain selection criteria for engineering materials. 04

05 (b) Define Dislocation. Explain the mechanism of Edge dislocation &

Screw dislocation

(c) Draw miller indices of following Planes:- (1 0 0 ) , (1 1 1) 02

Q.3 (a) What is the significance of Recovery and Recrystallization process 06

and also mention the mechanism of grain growth.

05 (b) Explain the Solidification process of pure metal and Differentiate

planar and dendritic mode of solidification.

Q.4 (a) Draw Iron – Carbon equilibrium diagram and write the suitable

reaction.

06

03 (b) Write compositions, properties and application of white cast iron.

(c) Define Shrinkage and Pipe Defects. 02 Q.5 (a) Explain in detail Basic process of powder metallurgy. 04

04

(b) What is plastic deformation and differentiate slip deformation and

twinning deformation

(c) Describe and illustrate the following imperfections that can occurs in

crystal lattice.

(i) Frenkel defect

(ii)Schottky defect

03

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ROLL NO. _____________

SILVER OAK COLLEGE OF ENGINEERING & TECHNOLOGY

B.E. Semester-III (ME) - MID SEMESTER EXAMINATION

SUBJECT: (131901) Electrical Machines & Electronics

DATE: 10/10/2014 TIME: 02:00 to 03:30 pm TOTAL MARK: 40 Instructions: 1. Question – 1 is compulsory.

2. Attempt any 3 out of remaining 4. 3. Figure to the right indicates full marks. 4. Assume Suitable data if required.

Q.1 Answer the following questions. (07)

1) DC motor yoke is generally made of

(a) wood (b) copper

(c) Cast Iron (d) aluminum

2) A transformer is a constant

(a) Current device (b) Voltage device

(c) Main flux device (d) Power device

3) During parallel operation of transformers incorrect polarity will result in

(a) Open circuit (b) Regeneration of power

(c) Dead short circuit (d) Power factor will be different from that of the connected load

4) In performing the short circuit test of a transformer

(a) High-voltage side is short-circuited (b) Any side is short-circuited with preference

(c) Low-voltage side is short-circuited (d) None of these

5) The function of a Commutator in a DC machine is

(a) to provide easy speed control (b) to improve commutation

(c) to convert AC Emf to DC Emf (d) to convert ac current to DC current

6) Isolators are used to disconnect a circuit when

(a) line is on full load (b) line is energized

(c) Circuit breaker is not open (d) There is no current in the line.

7) Which one of the following is not a type of tariff?

(a) Simple Tariff (a) Simple Tariff

(c) Current Factor Tariff (c) Current Factor Tariff

Q.2 (A) Explain the use of CT & PT for current and voltage measurements. (04)

Q.2 (B) Discuss the comparison between core type and shell type transformer. (04)

Q.2 (C) Define the following terms. (03)

1) Feeders 2) Distributors 3) Supply mains

Q.3 (A) Define power factor. And explain power factor improving methods. (06)

Q.3 (B) Draw Schematic diagram of a DC machine with labels. Also state functions of (05)

(i) Pole and Pole shoe

(ii) Commutator and brush Q.4 (A) Define the term Tariff. Also explain the types of Tariff. (07)

Q.4 (B) Explain the working principle of single phase transformer. (04)

Q.5 (A) Derive an EMF equation for single phase transformer. (04)

Q.5 (B) Give the comparison between AC & DC transmission system. (03)

Q.5 (C) Calculate no of turns on both primary and secondary for following given data. A 10 KVA,

500/250 v, 50 Hz, 1-phase transformer has a net area of cross section 30 cm2 and max flux

density is 1.2 Tesla. (04)

& BEST OF LUCK &

Enroll. No. _____________

SILVER OAK COLLEGE OF ENGINEERING & TECHNOLOGY

B.E. Semester- (III) - MID SEMESTER EXAMINATION (Winter’14 Session)

SUBJECT: Advanced Engineering Mathematics (2130002)

Date:09-10-2014 TIME: 11:00 A.M. to 12:45 P.M Total Marks: 40

Instructions: 1. Questionone is compulsory.

2. Attempt any three from rest of the questions

3. Figures to the right indicatefull marks.

4. Assume suitable data if required

Q-1 Select the correct answer from the option given for each question.

(1) .________1 n 07

(a) )(nn (b) )1( nn

(c) )1()1( nn (d) ) )1()1( nn

(2)

Find the Order and Degree of xydx

dysin

2

1

(a) Order 1,Degree 1 (b) Order 1,Degree 2

(c) Order 2,Degree 1 (d) Order 2,Degree 2

(3) Solve .0' yxy

(a) cyx (b) cxy

(c) cyx / (d) cyx

(4) Two solutions )(1 xy and )(2 xy are said to be linearly dependent if ?

(a) 0),( 21 yyw (b) 0),( 21 yyw

(c) 1),( 21 yyw (d)None of these

(5) Laplace of sinkt=________

(a)

22 ks

k

(b)

22 ks

s

(c)

22 ks

k

(d)

22 ks

s

(6) Laplace of __________3 t

(a)

3

1

s (b) 3ln

1

s

(c) se (d) None of these

(7) The Particular Integral of (D+1)2y=e

- x is?

(a) xe

x

2

2

(b) xe

x

2

2

(c) xex 2 (d) xxe

Q.2 (a)

Using method of undetermined coefficients, find the general solution

of 325102 2 xyyy

6

(b) Obtain the Fourier series to represent the function

20,)(4

1)( 2 xxxf

5

Q.3 (a) Solve using Laplace Transform

𝑦 ′′ + 2𝑦 ′ + 𝑦 = 𝑒−𝑡 ,𝑦 0 = −1 𝑎𝑛𝑑𝑦 ′ 0 = 1

6

(b)

Solve xydx

yd2tan4

2

2

by method of variation parameter.

5

Q.4 (a)

(i)Solve: 23 11 xey

dx

dyx x

6

(ii)Solve the D.E. by the exact differential.

0)1(,01 ydyxedxeex yyx

(b) Find Fourier Series for 22)( xxxf in the interval (0,3)

5

Q.5 (a)

(i)Using convolution theorem ,determine 𝐿−1

𝑎

𝑠2 (𝑠2+𝑎2)

6

(ii)Find𝐿−1 𝑙𝑛 1 +𝑤2

𝑠2

(b)

Solve )sin()23( 2 xeyDD 5

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