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Old April 11th, 2015, 08:41 AM
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Default ISRO technical assistant mechanical Model Question Papers

Hi I want the question paper of ISRO technical assistant mechanical exam so can you provide me?
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Old April 11th, 2015, 11:08 AM
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Default Re: ISRO technical assistant mechanical Model Question Papers

Ok, as you want the question paper of ISRO technical assistant mechanical exam so here I am providing you.

ISRO technical assistant mechanical exam question paper

1 The concept of 覧覧覧覧覧- derived from the 纏EROTH LAW OF THERMODYNAMICS.
TEMPERATURE

2 The concept of 覧覧覧覧覧覧- derived from the 鉄ECOND LAW OF THERMODYNAMICS.
ENTROPY

3 The expression for isentropic index [γ] in terms of number of degrees of freedom
( n ) 覧覧覧覧
1+ [ 2 / n]

4 The critical Reynolds no upto which the viscous flow exists in pipe 覧覧覧-
2000

5 Two forces of equal magnitude P acts at right angles to each other and having same directions. Find out the expression for their resultant [R ]覧覧覧
[2]ス P

6 The angular frequency of handclock覧覧覧
Π/30 rad/s

7 The equation for free torsional vibration覧覧覧覧-
[1/2Π] [q/I]ス

8 A thin cylinder is subjected to longitudinal stress σ0 and internal pressure P , findout the maximum shearstress developed in it [ q max] 覧覧覧覧
0.5 σ0

9 Rate of moment of momentum is equal to the 覧覧覧覧-
Torque applied by the body
10 The expression for loss of energy [he ] due to sudden enlargement of the pipe覧
he =[v1-v2]イ/2g
11 A spring of stiffness K is divided into 渡 number of springs. Each spring having stiffness 覧覧覧覧
nK
12 The non-dimensional number corresponds to
[inertia forcecompressibility force]ス覧覧覧覧覧 Euler number
13 Equation for forced vortex flow覧覧覧覧蘭
v/r = constant
14 The causes of cavitation
Metallic surfaces are damaged
Noise & vibrations
15 How to increase the thermal efficiency in Carnot cycle by覧覧覧覧覧-
Decreasing low temperature
16 The slenderness ratio in columns can be obtained from the 覧覧
Least radius of gyration
17 50:1 gear reduction ratio possible in覧覧蘭
worm gear
18 Wire drawing property named as 覧覧覧覧-
ductility
19 One man is standing in the elevator and the elevator is moving in the upward direction. What type of reading regarding the weight of man will we get from gauge覧覧
The weight of man shown by the gauge will more the actual weight of the man.
20 LMTD for counterflow heat exchanger is compared to parallel to heat exchanger蘭
More
21 The free damping equation 2yココ + 3yコ +8y =0. Calculate damping factor (D.F )覧
3/8
22 The discharges for the two parallel pipes of same lengths are Q1 & Q2 respectively and their diameters are 200 mm & 800 mm respectively. Calculate the ratio of discharge of smaller pipe to larger pipe.
1/32
23 A compressor is used to compress the air from 5 bar to 10 bar .Calculate its critical
pressure [ P٭]覧覧覧-
2.64 bar
24 Equivalent twisting moment覧覧覧覧覧
Te = [Tイ + Mイ]ス
25 The shear stress distribution in pipe flow 覧覧覧覧蘭
Centre is zero and linearly varying from the center to the wall
26 The irrational component in x-y is覧覧
δv/δx = δu/δy
27 The ratio kinetic viscosity/thermal diffusivity is 覧覧-
Nusselt Number
28 The cylinder is subjected to insulations K & 2K at the outside surface to avoid heat transfer. In order to arrest heat transfer effectively , which insulation should be provided first at the outer surface?
2K & K respectively

29 The wall having conductivities
K1 K2
Findout the equivalent conductivity of the material覧覧覧?

29 The maximum amplitude in this vibration equation y = 6 sinωt 覧
6

30 The thermal boundary layer in an ideal fluid flow is 覧覧
0

31 What does tend to stagnation point 覧覧覧蘭
The velocity is 0 at the stagnation point due to the increase in pressure energy from the conversion of K.E into P.E.

32 Match the following:
i. subsonic nozzle : figure
ii. Supersonic nozzle : figure
iii. Subsonic diffuser : figure
iv. Centrifugal compressor : figure

33 The factor of safety subjected to number of cycles related to
Endurance limit

34 In composite beam , width is directly proportional to 覧覧覧覧覧蘭
if the depth of the beam is kept constant.
α M

35 The heat transfer rate of hollow cylinder is inversly proportional to the following
覧覧覧覧覧 r2/r1

36 A material at 300コC is immersed in water at 30コC such that it will take 170 seconds to become 150コC .
A same material at 300コC is put in air at 30コC but it will take 200 seconds to become 150コC. What is the reason behind it ?
K of water is more compared to air

37 Radiation is 覧覧覧覧覧覧覧 wave phenomenon
Electromagnetic without medium

38 The compression ratio[r] of petrol engine ranges from 覧覧覧-
6 to 10
39 ∫δQ/T =0 and Δs=0 corresponds to - irreversible & adiabatic

40 Cold working of metal increases 覧覧覧-
Tensile strength

41 The power absorbed in belt drive depends on覧覧覧蘭
Tension in tight side, Tension in slack side, coefficient of friction & Radius of pulley.

42 The temperature loss related 覧覧 hysteresis loss

43 The convergent pipe having entry and exit diameters are 100 and 50 mm respectively, find out their velocity ratio from entry to exit..
1/4

44 They had given one composite circular pipe having 4 varying cross sections . They are 2D, 1.5D, 4D & D respectively. The water is entering at velocity V at section 1 and leaving at section 4. Find out the pressure decreasing order
P4>P2>P1>P3

45 The bulb having weight 150N supported by two ropes and attached to the walls having angles
45コ & 60コ. Findout the reaction forces in the ropes ?
This is related to Lamis theorem

46 A hollow sphere of radius r . A particle is moving with coefficient of friction 1/[3]ス inside the sphere from wall . which height will it become rest?

47 The disc is resting on the rough wall by a rope tied at the center . The rope makes angle with the wall around 30コ. The tension in the string is 覧-than the weight of the disc. more

48 A railway wagon containing partially full of water. Which angle覧覧-

49 Findout the graph between discharge [Q] in the x-axis and head [H] in the y-axis覧-

50 In welding pitch dimension is limited to覧覧覧-

51 The composition of inconel alloy覧覧覧-
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