hydraulic machines MCQs – Page 3

Practise focused hydraulic machines questions with marked answers for exam preparation and subject revision.

hydraulic machines Mcqs

41. Any change in load is adjusted by adjusting following parameter on turbine______________?
0

A. net head

B. relative velocity of flow at inlet

C. absolute velocity

D. flow

E. blade velocity

42. Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of_______________?
0

A. 39.2%

B. 68.80%

C. 91.6%.

D. 84.80%

E. 49.20%

43. Air vessels in reciprocating pump are used to__________________?
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A. reduce acceleration to minimum

B. save pump from cavitation

C. increase pump efficiency

D. smoothen flow

E. increase pump head

44. Motion of a liquid in a volute casing of a centrifugal pump is an example of____________________?
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A. spiral vortex flow

B. forced cylindrical vortex flow

C. rotational flow

D. radial

E. forced spiral vortex flow

45. The efficiency of a centrifugal pump is maximum when its blades are__________________?
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A. bent backward first and then forward

B. bent backward

C. bent forward

D. straight

E. bent forward first and then backward

46. One horsepower is equal to_________________?
0

A. 33000 watts

B. 736 watts

C. 102 watts

D. 550 watts

E. 75 watts

47. A hydraulic intensifier normally consists of __________________?
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A. special type of pump with storage device and a pressure regulator

B. a cylinder and a ram

C. two co-axial rams and two cylinders

D. a cylinder, a piston, storage tank and control valve

E. two cylinders, two rams and a storage device

48. Low specific speed of a pump implies it is____________________?
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A. centrifugal pump

B. none of the above

C. any one of the above

D. mixed flow pump

E. axial flow pump

49. Reaction turbines are used for____________________?
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A. high head

B. low head and high discharge

C. low head

D. high head and high discharge

E. high head and low discharge

50. The angle of taper on draft tube is A. greater than 15 B. greater than 8 C. greater than 5 D. less than 8 E. less than 3.___________________?
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A. greater than 5

B. less than 3.

C. angle of taper on draft tube is

D. less than 8

E. greater than 8

F. greater than 15

51. In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by_______________?
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A. trimming the impeller size to the required size by machining

B. designing new impeller

C. none of the above

D. not possible

E. some other alterations in the impeller

52. For starting an axial flow pump, its delivery valve should be____________________?
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A. closed

B. partly open and partly closed

C. depends on starting condition and flow desired

D. could be either open or closed

E. open

53. The flow rate in gear pump___________________?
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A. none of the above

B. decreases with increase in pressure

C. unpredictable

D. increases with increase in pressure

E. more or less remains constant with in-crease in pressure

54. Medium specific speed of a pump implies it is_________________?
0

A. axial flow pump

B. any one of the above

C. mixed flow pump

D. centrifugal pump

E. none of the above

55. The horse power required in above case will be___________________?
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A. 0.75 B.H.P.

B. B.H.P./0.75

C. 1.5 B.H.P.

D. same

E. none of the above

56. Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of__________________?
0

A. 39.20%

B. 49.20%

C. 84.8%

D. 91.6%.

E. 68.80%

57. Hydraulic accumulator is used for____________________?
0

A. accumulating hydraulic energy

B. supplying energy when main supply fails

C. accumulating oil

D. generally high pressures to operate hydraulic machines

E. supplying large quantities of oil for very short duration

58. Runaway speed of a hydraulic turbine is_________________?
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A. the speed corresponding to maximum overload permissible

B. the speed at which turbine runner will be damaged

C. none of the above.

D. full load speed

E. the speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open

59. Francis, Kaplan and propeller turbines fall under the category of___________________?
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A. Reaction-cum-impulse turbines

B. Mixed flow turbines

C. Reaction turbines

D. Impulse turbines

E. Axial flow turbines

60. In a centrifugal pump, the liquid enters the pump__________________?
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A. at the top

B. at the bottom

C. at the center

D. none of the above

E. from sides

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