Placement Papers: BHEL Placement Paper 11 Feb 2007 New Delhi

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  1. The ratio of two specific heats of air is equal to- = 1.41

  2. A perfect gas at 270C is heated at constant pressure till its volume is double-The final temperature is = 3270C

  3. An engine operates between temperature of 9000K and T2 and another engine between T2 and 8000K-For both to do equal work, value of T2 will be- = 6500K

  4. Internal energy of a substance depends on = Temperature

  5. Work done in compressing 1kg of gas adiabatically from p1, V1, T1 to p2, V2, T2 is equal to = Cv (T2 − T1)

  6. The unit of entropy is = J/kg 0K

  7. Indicated power of a 4-stroke engine is equal to = pLAN/2

  8. Which of the following is not an internal combustion engine:

    1. 2 stroke petrol engine

    2. 4 stroke petrol engine

    3. Diesel engine

    4. steam engine

    5. Gas turbine- = (d)

  9. If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the:

    1. exhaust will be smoky

    2. piston rings would stick into piston grooves

    3. exhaust temperature will be high

    4. engine starts overheating

    5. all of the above- = (e)

  10. The spark plug gap is normally maintained at: = 0.45 to 0.6mm

  11. A distributor in spark ignition engines performs the function of: = Providing the correct firing order in engine

  12. Which of the following does not relate to CI-engine:

    1. fuel pump

    2. fuel injector

    3. governor

    4. carburetor

    5. flywheel = (d)

  13. Air fuel ratio in a jet engine is = 60: 1

  14. What is the value of Prandtl No.

  15. In domestic refrigerator, the tubes at the back of the refrigerator are:

    1. evaporator

    2. condenser

    3. capillary tubes

  16. Which refrigerants has the highest critical point temperature- = Freon-11

  17. Wet bulb temperature is- = indication of amount of moisture in air

  18. On psychometric chart, dry bulb temperature lines are- = Vertical

  19. Surface tension has the units- = newtons/m

  20. The line of action of the buoyant force acts through the- = Centroid of the displaced volume of fluid

  21. A pressure of 25m of head of water is equal to- = 245kN/m2

  22. For a submerged body to be in stable equilibrium, the center of gravity should be- = Below the center of buoyancy.

  23. The actual velocity at vena contracta for flow through an orifice from a reservoir of height H =? - = Cvv2gH

  24. A body weighing 2kg in air weights 2.5kg when submerged in water-Its specific gravity is- = 6

  25. In a free vortex motion: = each particle moves in a circular path with a speed varying inversely as the distance from the center.

  26. A centrifugal pump has speed-1000rpm, Flow-1200l. p. m, Head-20m, Power-5H. P-If its speed is increased to 1500rpm, new flow will be. = 1800l. p. m

  27. Runaway speed of a hydraulic turbine is: = the speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open.

  28. 10m of water column is equal to = 100kN/m2

  29. M. I-of a circular area about an axis perpendicular to the area is: = pr4/2

  30. A projectile is fired at an angle? to the vertical-Its horizontal range will be maximum when? is- = 450

  31. An elevator weighing 1000kg attains an upward velocity of 4m/sec in two seconds with uniform acceleration-The tension in the supporting cables will be = 1200kg.

  32. A 13m ladder is placed against a smooth vertical wall with its lower end 5m from the wall-What should be the co-efficient of friction between ladder and floor so that it remains in equilibrium- = 0.21

  33. A car is moving with a velocity of 60km/hr and possesses energy of 5 × 105 joules-The mass of the car will be- = 3000kg.

  34. If l is the span of a light suspension bridge whose each cable carries total weight (w) and the central diop is y, the horizontal pull at each support is: = wl/y OR

  35. A beam of length l, having uniform load w kg/unit length is supported freely at the ends-The moments at mid span will be: = wl2/8.

  36. A boiler shell 200cm dia and plate thickness 1.5cm is subjected to internal pressure of 1.5MN/m2, then the hoop stress will be- = 100N/m2

  37. 100KW is to be transmitted by each of two separate shafts-A is turning at 250rpm and B at 300rpm-Which shaft must have greater diameter. = B

  38. Two identical leaf springs of spring constant k are arranged like cantilevers in parallel and attached at free end by a spring of spring constant k-The equivalent spring constant of combination is; = 1.5k.

  39. Automobile steering gear is an example of: = lower pair.

  40. The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is- = Universal coupling.

  41. To transmit power from one rotation shaft to another whose axes are neither parallel nor intersecting, use: = Spiral gear.

  42. A gear having 100 teeth is fixed and another gear having 25 teeth revolves around it, the centre lines of both gears being joined by an arm-How many revolutions will be made by gear of 25 teeth for one revolution of arm- = 5 rev.

  43. The secondary critical speed of a shaft occurs at: = twice the speed of primary critical speed.

  44. Brittle coating technique is used for: = experimental stress analysis.

  45. Factor of safety is the ratio of: = yield stress/working stress.

  46. Type of gear used for non-intersection perpendicular shafts: = Hypoid gears.

  47. Corrosion resistance of steel is increased by adding: = Chromium & Nickel

  48. The product of Cupola is called: = cast iron

  49. Brinell tester uses a hardness steel ball of size: = 10mm

  50. Sintered and tungsten carbides can be machined by: = EDM

  51. What kind of abrasive cut off wheel should be used to cut concrete, stone and masonry? = Diamond grit.

  52. In break-even analysis, total cost consists of: = Fixed cost + Variable cost.

  53. The amount deducted from the salary of workers towards employees provident fund is: = deposited in the account of worker with Provident Fund Commissioner.

  54. PERT is: = event oriented technique

  55. Bar charts are suitable for: = minor works.

  56. on a PERT/CPM chart represents: = a significant event representing some mile-stone

  57. Electron volt is the unit of: = Energy.

  58. Seamless tubes are made by?

  59. Reheating in gas turbine results in: = increase of work ratio and decrease of thermal efficiency.

  60. Why DC current is not used in transformer?

  61. What is the purpose of draft tube in hydraulic turbines: = to convert the kinetic energy into pressure energy.

  62. A mass of 100kg is falling from a height of 1m and penetrates the sand to 1m-what is the resistance force of the sand?

  63. Two cars travel in the same direction at 40km/hr at a regular distance-A car comes in the opposite direction at 60km/hr-It meets each car in a gap of 8 seconds-What is the distance between the two cars?