silver oak college of engineering & technology aditya...

Enroll. No. _____________

SILVER OAK COLLEGE OF ENGINEERING & TECHNOLOGY ADITYA SILVER OAK INSTITUTE OF TECHNOLOGY

BE - SEMESTER–V • MID SEMESTER-I EXAMINATION – WINTER 2017 SUBJECT: DESIGN OF MACHINE ELEMENTS (2151907) (ME)

DATE: 08-08-2017 TIME: 02:00 pm to 03:30 pm TOTAL MARKS: 40

Instructions: 1. All the questions are compulsory. 2. Figures to the right indicate full marks. 3. Assume suitable data if required.

Q.1 (a) 1. Define circumferential stress.

2. What is stress concentration factor?

3. What is 25Cr4Mo2 designation of steel?

4. Define fatigue failure.

5. Define toughness.

[05]

(b) State the methods of reducing stress concentration. [05]

Q.2 (a) State and illustrate various principal design rules as per Casting Design. [06]

(b) What are the principles of design for manufacture and assemblies (DFMA)? [05]

(C) Derive an expression of length of cross belt drive. [04]

OR

Q.2 (a) What do you mean by design for standardization? Explain it in detail. [06]

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Enroll. No. _____________

SILVER OAK COLLEGE OF ENGINEERING & TECHNOLOGY ADITYA SILVER OAK INSTITUTE OF TECHNOLOGY

BE - SEMESTER–V • MID SEMESTER-I EXAMINATION – WINTER 2017 SUBJECT: DESIGN OF MACHINE ELEMENTS (2151907) (ME)

DATE: 08-08-2017 TIME: 02:00 pm to 03:30 pm TOTAL MARKS: 40


Q.1 (a) 1. Define circumferential stress.

2. What is stress concentration factor?

3. What is 25Cr4Mo2 designation of steel?

4. Define fatigue failure.

5. Define toughness.

[05]

(b) State the methods of reducing stress concentration. [05]

Q.2 (a) State and illustrate various principal design rules as per Casting Design. [06]

(b) What are the principles of design for manufacture and assemblies (DFMA)? [05]

(C) Derive an expression of length of cross belt drive. [04]

OR

Q.2 (a) What do you mean by design for standardization? Explain it in detail. [06]

Page 1 of 2

(b) What are preferred numbers? The maximum & minimum load carrying capacities of dumpers

in a manufacturing unit are 40 kN and 630 kN respectively. The company is interested in

developing seven models in this range. Specify their load carrying capacities.

[05]

(c) Derive an expression of length of open belt drive. [04]

Q.3 (a) Derive the expression of a ratio of driving tensions for the flat belt drive. [06]

(b) An air receiver consisting of a cylinder closed by hemispherical ends

shown in figure. It has a storage capacity of 0.25 m3 and an operating

internal pressure of 5 MPa. It is made of plain carbon steel 10C4 (Sut= 340

N/mm2) and the factor of safety is 4. Neglecting the effect of welded

joints, determine the dimension of the receiver.

[05]

(c) Explain Ergonomics design consideration. [04]

OR

Q.3

(a) A flat belt drive transmits 50 kW at 25 m/s. The mass of the belt is 1.75 kg per meter of belt

length and width the belt is 180 mm. The belt drive is cross belt drive having driver pulley of

350 mm and driven pulley of 1050 mm. The centre distance between two pulleys is 5 m.

calculate the length of belt; angle of contact; belt tensions and thickness of belt. Take mass

density of belt= 1000 kg/m3 and coefficient of friction between belt and pulley surface=0.35.

[06]

(b) Derive the expression for the stresses induced in a thin cylinder subjected to internal pressure. [05]

(c) Explain Aesthetic design consideration. [04]

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(b) What are preferred numbers? The maximum & minimum load carrying capacities of dumpers

in a manufacturing unit are 40 kN and 630 kN respectively. The company is interested in

developing seven models in this range. Specify their load carrying capacities.

[05]

(c) Derive an expression of length of open belt drive. [04]

Q.3 (a) Derive the expression of a ratio of driving tensions for the flat belt drive. [06]

(b) An air receiver consisting of a cylinder closed by hemispherical ends shown

in figure. It has a storage capacity of 0.25 m3 and an operating internal

pressure of 5 MPa. It is made of plain carbon steel 10C4 (Sut= 340 N/mm2)

and the factor of safety is 4. Neglecting the effect of welded joints,

determine the dimension of the receiver.

[05]

(c) Explain Ergonomics design consideration. [04]

OR

Q.3

(a) A flat belt drive transmits 50 kW at 25 m/s. The mass of the belt is 1.75 kg per meter of belt

length and width the belt is 180 mm. The belt drive is cross belt drive having driver pulley of

350 mm and driven pulley of 1050 mm. The centre distance between two pulleys is 5 m.

calculate the length of belt; angle of contact; belt tensions and thickness of belt. Take mass

density of belt= 1000 kg/m3 and coefficient of friction between belt and pulley surface=0.35.

[06]

(b) Derive the expression for the stresses induced in a thin cylinder subjected to internal pressure. [05]

(c) Explain Aesthetic design consideration. [04]

Page 2 of 2

Enroll. No. _____________

SILVER OAK COLLEGE OF ENGINEERING & TECHNOLOGY

ADITYA SILVER OAK INSTITUTE OF TECHNOLOGY

BE - SEMESTER–V • MID SEMESTER-I EXAMINATION – WINTER 2017

SUBJECT: FLUID POWER ENGINEERING (2151903) (ME)

DATE: 10-08-2017 TIME: 02:00 pm to 03:30 pm TOTAL MARKS:40

Instructions: 1. All the questions are compulsory.

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

Q.1 (a) Give function of the following elements of hydropower plant:

1) Surge tank 2) Trash rack 3)Penstock 4)Spillway 5)Draft tube

[05]

(b) Write advantages and disadvantages of hydroelectric power

plant.

[05]

Q.2 (a) A small ship driven by reaction jets and discharging at stern is

estimated to have a relative velocity of 12 m/s when moving at

30 km/hr. The cross sectional area of the jets at the discharge is

240 cm2. Find the resistance to the motion of the ship and

propulsive work if water enters through orifice facing the

direction of motion of ship and pump is 85 % and friction losses

in the pipe are equivalent to 3.6 m of water head.

Calculate a) power required to drive the pump

b) Overall efficiency of pump.

[06]

(b) Derive the equation for the work done when jet strikes normally

at the centre of moving flat vertical plate.

[05]

(c) Show that the efficiency of propulsion when the inlet orifice

faces the direction of motion of ship is given by η= 2u/ V+2u,

where V is absolute velocity of issuing jet and u is velocity of

ship.

[04]

OR

Q.2 (a) A jet of water having velocity of 40 m/s impinges without shock

on a series of vanes moving at 12 m/s. The jet is making an angle

of 20˚ with the direction of the motion of vane. Relative velocity

at outlet is 0.9 times the relative velocity at inlet and absolute

velocity of water at exit is normal to the direction of motion of

vane.

Now, calculate a) Vane angles at inlet and outlet

b) Work done on vane per kg of water.

c) Efficiency.

[06]

(b) Derive the equation of forces when jet strikes tangentially at

one end of symmetrical fixed curved blade.

[05]

(c) Show that the efficiency of the free jet striking normally on the

series of flat plates mounted on the periphery of a wheel can

never exceed 50%.

[04]

Q.3 (a) With usual notations derive an expression for indicated work of

reciprocating air compressor by considering clearance.

[06]

(b) A single acting single cylinder reciprocating air compressor is

driven by 25kW electric motor. It takes air at 1.013 bar and

18˚C and delivers it at 8 bar. Compressor runs at 300 rpm. The

index of compression and expansion is 1.32 and the clearance

volume is 6% of swept volume assuming the mechanical

efficiency as 85% and bore is equal to stroke, calculate the free

air delivered in m3/min, the volumetric efficiency and the bore

and the stroke of the compressor.

[05]

(c) Explain root blower with the neat sketch. [04]

OR

Q.3 (a) Atmospheric air at 1 bar and 20˚C is taken into a simple

compressor having zero clearance. It is compressed according to

law pV1.2= constant to the constant discharge pressure of 4 bar.

The discharge is taken through a regulating valve into a closed

vessel of 3 m3 capacity. Here the initial conditions were 1 bar

and 20˚C and after charging for 4.2 minutes were 3.5 bar and

25˚C. Calculate neglecting clearance of compressor.

(i) The volume of air taken per minute if measured at

atmospheric conditions.

(ii) The indicated power required to drive the machine.

[06]

(b) Explain construction and working of reciprocating compressor. [05]

(c) Write short note on the following: Screw compressor. [04]

Enroll. No. _____________




SUBJECT: HEAT TRANSFER (2151909) (ME)



Q.1 (a) 1) What is heat transfer? 2) State Stefan boltzman law. 3) Define Opaque body. 4) Define Solid angle. 5) State fourier’s law of heat conduction.

[05]

(b) State and prove Kirchoff’s law of radiation. [05] Q.2 (a) Derive general heat conduction equation in Cartesian co-

ordinates. Also deduce the equation for

(i)No heat sources . (ii)No heat source and steady state condition. (iii)One dimensional heat conduction equation without heat generation under steady state.

[06]

(b) Derive equation of heat transfer by conduction through composite wall.

[05]

(c) Define : (1) Emissivity (2) Monochromatic emissive power (3) Radiosity (4) Black body.

[04]

OR Q.2 (a) Derive general conduction equation in cylindrical coordinate for

three dimensions. [06]

(b) State and explain Wien’s displacement law. [05] (c) Define Lambert’s cosine law of radiation and shape factor. [04] Q.3 (a) A cold storage room has walls made of 180 mm of brick on the

outside, 90 mm of plastic foam, and finally 20 mm of wood on the inside. The outside and inside air temperatures are 30 oC and -5 oC respectively. If the outside and inside convective heat transfer coefficients are respectively 10 and 30 W/m2 oC, and the thermal conductivities of brick, foam and wood are 1.0, 0.02 and 0.17 W/ m oC respectively. Determine: (a) overall heat transfer coefficient (b) the rate of heat removed by refrigeration if the total wall area is 100 m2 .(c)Temperature at inside surface of brick.

[06]

(b) Define total emissive Power (Eb) and intensity of radiation (Ib).

Show that Eb = 𝜋 ∗ 𝐼. [05]

(c) Explain three modes of heat transfer. [04] OR Q.3 (a) A wall is constructed of several layers. The 25 mm thick first

layer consists of brick (k = 0.66 W/mK), the second layer 2.5 cm mortar (k = 0.7 W/mK), the third layer 10 cm thick lime stone (k = 0.66 W/mK) and outer layer of 1.25 cm thick plaster (k = 0.7 W/mK). The heat transfer coefficient on interior and exterior of the wall are 5.8 W/m 2K and 11.6 W/m2K respectively. Find the rate of heat transfer per m2 , if the interior of the room is at 26°C and outer air is at -7°C.

[06]

(b) Derive equation of heat transfer by conduction through composite cylinder.

[05]

(c) State salient features of shape factor. [04]

Enroll. No. _____________




SUBJECT: MANUFACTURING PROCESSES – II (151901) (ME)




Q.1 (a) Give broad classification of manufacturing processes. [05]

(b) What is pattern? State various functions of patterns. [05]

Q.2 (a) Enlist various moulding sand and explain in detail? [06]

(b) List the various pattern materials. Explain any two along with

their advantages and limitations.

[05]

(c) Differentiate between hot chamber and cold chamber die

casting.

[04]

OR

Q.2 (a) Describe casting defects stating their causes and remedies. [06]

(b) Explain centrifugal casting process. [05]

(c) Define following terms: 1. Cope, 2. Drag, 3. Core, 4. Chaplet. [04]

Q.3 (a) Explain various types of pattern [06]

(b) What are the common allowance provided on pattern and why? [05]

(c) Explain the following with neat sketch :

(i) Core print

(ii) Sweep pattern

(iii)Match plate pattern

(iv) Draft allowance.

[04]

OR

Q.3 (a) State various criteria for the selection of manufacturing process.

Also discuss about significance of these criteria.

[06]

(b) Explain the following:

(i) Flow ability

(ii) Collapsibility

(iii) Adhesiveness

(iv) Reusability

(v) Cohesiveness

[05]

(c) Explain with neat sketches types of gating systems used in

casting process.

[04]

Enroll. No. _____________




SUBJECT: THEORY OF MACHINES (2151902) (ME)



Q.1 (a) Define equilibrium speed, sleeve lift, precision axis, clutch and governor.

[05]

(b) Explain working with Neat sketch of watt Governors and derive equation for height of watt governor.

[05]

Q.2 (a) A single plate clutch is required to transmit 8 kW at 1000 rpm.

The axial pressure is limited to 70 kN/m2. The mean radius of the plate is 4.5 times the radial width of the friction surface. If both the sides of the plate are effective and the coefficient of friction is 0.25, find the (i) inner and outer radii of the plate and the mean radius (ii) width of the friction lining (iii) axial force to engage the clutch.

[06]

(b) Derive the equation for the torque transmitted by the cone clutch with usual notation considering uniform pressure theory.

[05]

(c) Derive the equation for the torque transmitted by the cone clutch with usual notation considering uniform wear theory.

[04]

OR Q.2 (a) A leather faced conical clutch has a cone angle of 30º. If the

intensity of pressure between the contact surfaces is limited to 0.35 N/mm2 and the breadth of the conical surface is not to exceed one-third of the mean radius, find the dimensions of the contact surfaces to transmit 22.5 kW at 2000 r.p.m. Assume uniform rate of wear and take coefficient of friction as 0.15.

[06]

(b) Derive expression for frictional torque for single plate clutch considering uniform wear theory.

[05]

(c) Derive expression for frictional torque for single plate clutch considering uniform pressure theory.

[04]

Q.3 (a) Explain the effect of gyroscopic couple on four wheel drive. [06] (b) Explain gyroscopic couple and discuss its effect on an aero plane

taking turns when viewed from rear. [05]

(c) The turbine rotor of a ship has a mass of 2.2 tones and rotates at

1800 r.p.m. clockwise hen viewed from the left. The radius of

gyration of the rotor is 320 mm.

Determine the gyroscopic couple and its effect when

(1) Ship turns right at a radius of 250 m. with a speed of

25 km/hr.

(2) Ship pitches with the bow rising at an angular velocity of

0.8 rad/sec.

(3) Ship rolls at an angular velocity of 0.1 rad/sec.

[04]

OR Q.3 (a) A turbine rotor weighing 9.8 kN rotates at 2000 r.p.m clockwise

when viewed from stem. The vessel pitches with an angular velocity of 0.5 rad/s. Calculate the gyroscopic couple during the rise of bow if rotor has radius of gyration as 0.254 m.

[06]

(b) Explain the effect of a two wheeled vehicle. [05] (c) Discuss gyroscopic effects on naval ships. [04]

Enroll. No. _____________




SUBJECT: CONTROL ENGINEERING (2151908) (ME)




Q.1 (a) Define the following

i. Control Variable

ii. Manipulated Variable

iii. Feedback

iv. Summing Point

v. Take off point

[05]

(b) Compare hydraulic control system with pneumatic control system

in detail. State the different applications of pneumatic control

system.

[05]

Q.2 (a) Find the transfer function Y(s)/R(s) from Figure 1. [06]

(b) Represent a generalized hydraulic control system by a block

diagram and explain the functions of each element. [05]

(c) Give the Comparison of open loop and closed loop control system [04]

OR

Q.2 (a) Solve the block diagram shown in Figure 2. Obtain its transfer

function. [06]

(b) State the different types of hydraulic pumps and explain the factors

affecting selection it. Explain the construction and working of vane

pump with neat sketch

[05]

(c) State and explain conditions for a system to be a linear system. [04]

Q.3 (a) Write the differential equations governing the system shown in

Figure 3 and draw the Force-voltage analogous electrical network. [06]

(b) Determine the Transfer Function of the S.F.G shown in Figure 4.

by Masons Gain Formula [05]

(c) Explain closed loop control system using block diagrams of

suitable example. [04]

OR

Q.3 (a) Define transfer function. State the limitation of the transfer

function. Obtain the transfer functions x1(s)/f(s) and x2(s)/f(s) of

the mechanical system shown below. Draw a free body diagram of

each mass from figure 5

[06]

(b) For the signal flow graph of a multiple loop system shown in

figure 6, determine C(s)/R(s) using Mason’s gain formula. [05]

(c) Describe force-voltage analogy as applied to electrical analogies

for mechanical systems. [04]

Figure 1

Figure 2

Figure 4

Figure 3

Figure 6

Figure 5

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