# Placement Papers: ISRO Sample Paper on 30th Jun 2005 at Hyderabad

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1. The concept of____derived from the° ZEROTH LAW OF THERMODYNAMICS? TEMPERATURE

2. The concept of____derived from the° SECOND LAW OF THERMODYNAMICS? ENTROPY

3. The expression for isentropic index [Y£] in terms of number of degrees of freedom n____1 + [ 2/n]

4. The critical Reynolds no upto which the viscous flow exists in pipe____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 ]____2 P

6. The angular frequency of handclock____Y/30 rad/s

8. A thin cylinder is subjected to longitudinal stress Y20 and internal pressure P, findout the maximum shearstress developed in it [ q max]____0.5 Y20

9. Rate of moment of momentum is equal to the____Torque applied by the body

10. The expression for loss of energy [he ] due to sudden enlargement of the pipe____he = [v1 − v2]./2g

11. A spring of stiffness K is divided into° n? number of springs. Each spring having stiffness____nK

12. The non-dimensional number corresponds to [inertia force\compressibility force]____Euler number

13. Equation for forced vortex flow____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____Decreasing low temperature

16. The slenderness ratio in columns can be obtained from the____Least radius of gyration

17. 50: 1 gear reduction ratio possible in____worm gear

18. Wire drawing property named as____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____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____More

21. The free damping equation 2y + 3y + 8y = 0. Calculate damping factor (DF) ____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]____2.64 bar

24. Equivalent twisting moment____Te = [T + M]

25. The shear stress distribution in pipe flow____Centre is zero and linearly varying from the center to the wall

26. The irrational component in x-y is____Yxv/Yxx = Yxu/Yxy

27. The ratio kinetic viscosity/thermal diffusivity is____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____?

30. The thermal boundary layer in an ideal fluid flow is____0

31. What does tend to stagnation point____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:

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

34. In composite beam, width is directly proportional to____if the depth of the beam is kept constant. Y M

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

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

37. Radiation is____wave phenomenon Electromagnetic without medium

38. The compression ratio[r] of petrol engine ranges from____6 to 10

39. 2YxQ/T = 0 and Y's = 0 corresponds to____irreversible & adiabatic

40. Cold working of metal increases____Tensile strength

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

42. The temperature loss related____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. ¼

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

45. The bulb having weight 150N supported by two ropes and attached to the walls having angles 45 & 60. 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/ 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. The tension in the string is____than the weight of the disc. More

48. A railway wagon containing partially full of water. Which angle____

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

50. In welding pitch dimension is limited to____

51. The composition of inconel alloy____

52. There is a heat transfer between two walls having thickness and conductivities k1 & K2 respectively. The linear temperature profile of first wall is more steeper than the second wall. Findout the ratio K1/K2____

53. The max shear stress developed in solid circular shaet is 100 MPa. Calculate the max normal stress developed in it?

54. This question related to welding____

55. Bearing liner____

56. Electrical resistance material____Nichrome

57. This question related to radiation

58. A sun emits 1150K at 0.5Y. A furnace emits 300k from small door____

59. In the simple pendulum, the maximum amplitude depends on____increase in length

60. The fuel flow increases if____

61. The jet propulsion depends on____

62. What is the condition for perfect frame____

63. Depth of cut can be increased by____

64. The workpiece can be held in____

65. This is related toNucleate boiling

66. What is the expression for Reynolds number in terms of diameter of the pipe. Re = Y? VD/Y

67. Air conditioning means____68 Fibrous fracture occurs in------------------------

68. In laser beam machining, the workpiece should be____

69. Foam and coke are good insulators. Why? ____

70. Gold property____

71. In lathe, the workpiece can be held in____