Quiznetik

Fluid Mechanics and Machinery | Set 3

1. What is the instrument used for the automatic control scheme during the fluid flow?

Correct : D. pilot static tube

2. Which among the following does not depend on the friction factor?

Correct : D. weight

3. Darcy- Weisbach equation gives relation between

Correct : C. head loss and pressure loss

4. Loss of head due to friction is

Correct : C. inversely proportional to hydraulic radius

5. The formula for hydraulic diameter is

Correct : A. 4a/p

6. Relative roughness is

Correct : A. ϵ/d

7. The liquid flowing through a series of pipes can take up

Correct : A. pipes of different diameters

8. The total head loss for the system is equal to

Correct : D. height difference of reservoirs

9. Which among the following is not a loss that is developed in the pipe?

Correct : D. liquid velocity

10. If the two reservoirs are kept at the same level, the head loss is

Correct : B. zero

11. The pipe diameter is

Correct : B. directly proportional to mass flow rate

12. Coefficient of friction of a laminar flow is

Correct : C. 16/re

13. 1 NEED FOR DIMENSIONAL ANALYSIS - METHODS OF DIMENSIONAL ANALYSIS

Correct : C. chemistry

14. Similitude is a concept applicable to the testing of

Correct : C. engineering models

15. A model of with same shape is

Correct : A. geometric similarity

16. All the parameters in a similitude are described using

Correct : A. continuum mechanics

17. The rate at which the particles of fluid can spread is called

Correct : B. diffusivity

18. The Prandtl Number approximates

Correct : A. momentum diffusivity to thermal diffusivity

19. Which among the following is the standard symbol for Atwood number?

Correct : A. a

20. Fanning friction factor is

Correct : A. 0.25 times darcy friction factor

21. Which among the following is the standard symbol for Froude number?

Correct : C. fr

22. Principle of fluid mechanics works on the utilization of

Correct : C. work

23. The force analysis on a curved vane is understood using

Correct : A. velocity triangles

24. Jet propulsion works on the principle of

Correct : C. newton’s third law

25. The relative velocity is obtained by the equation

Correct : A. u – v1

26. If the friction is neglected, then

Correct : C. vr1 = vr2

27. Through inlet orifices, which are facing the direction of motion of the ship, the water from the sea can be taken by the pump.

Correct : A. true

28. Jet propulsion of ship is less efficient than screw propeller due to

Correct : C. frictional losses

29. A jet strikes a curved plate at its

Correct : C. centre

30. Which among the following is not a type of jet engine?

Correct : D. propulsive jet

31. The fluid gains                    while passing through the impeller.

Correct : D. velocity and pressure

32. What is the shape of the diffuser in the centrifugal pump?

Correct : B. dough nut

33. When the casing in a centrifugal pump decelerates the flow, what increases?

Correct : A. pressure

34. The velocity imparted by the impeller is converted into

Correct : A. pressure energy

35. The consequence of Newtons second law is

Correct : A. conservation of angular momentum

36. Euler developed the head pressure equation in centrifugal pumps.

Correct : A. true

37. What is a major advantage of centrifugal pump?

Correct : B. simple in construction

38. Different velocities in a centrifugal pump are determined by using

Correct : A. velocity triangle

39. With the increase in the input power, efficiency

Correct : B. decreases

40. Turbomachines work under

Correct : B. newtons second law

41. The main function of nozzle is to

Correct : A. pump start procedure

42. The main function of centrifugal pumps are to

Correct : D. transfer energy

43. The inlet passage of water entry is controlled by

Correct : B. gate

44. Centrifugal pumps transport fluids by converting

Correct : A. kinetic energy to hydrodynamic energy

45. With the increase in load, Energy in the turbine

Correct : A. decreases

46. When the balancing of the turbine is disturbed, we use

Correct : D. emergency governing

47. The fluid coming into the centrifugal pump is accelerated by

Correct : B. impeller

48. Reciprocating pump is a

Correct : B. positive displacement pump

49. The cylinder of reciprocating cylinder is made up of

Correct : A. cast iron

50. The higher discharge valve line holds the discharge valve

Correct : B. closed

51. Reciprocating pumps are also called as

Correct : A. force pumps

52. Reciprocating pumps are classified according to

Correct : B. number of cylinders

53. Simple hand operating pump is also called as

Correct : B. bicycle pump

54. Internal cavitation in reciprocating pumps occurs due to

Correct : C. shock waves

55. Operation of reciprocating motion is done by a                  source

Correct : A. power

56. High pressure reciprocating pumps are generally from 1500 HP.

Correct : A. true

57. Which of the following centrifugal pumps has higher specific speed than the others?

Correct : A. axial flow

58. Pump transfers the mechanical energy of a motor or of an engine into                    of a fluid.

Correct : D. pressure energy, kinetic energy or both

59. Which of the following is NOT a type of positive displacement pumps?

Correct : C. centrifugal pump

60. Rotary displacement pumps are suitable for handling

Correct : A. oils

61. Which of the following is/are not example/s of rotary displacement pumps?

Correct : D. centrifugal pump

62. pump is also called as velocity pump.

Correct : C. centrifugal

63. Discharge capacity of the reciprocating pump is                      that of the centrifugal pump.

Correct : B. lower than

64. The process of filling the liquid into the suction pipe and pump casing up to the level of delivery valve is called as

Correct : C. priming

65. Main application of liquid ring pump is in which of the following?

Correct : B. heavily aerated liquids

66. What is the water flow direction in the runner in a Francis turbine?

Correct : C. radial and then axial

67. Which of the following runner types will have the highest vane angle at inlet (β1 value)?

Correct : C. fast runner

68. 2 AXIAL, RADIAL AND MIXED FLOW TURBINES.

Correct : A. guide vane angle at inlet

69. A hydraulic coupling belongs to the category of

Correct : D. energy transfer machines

70. The electric power which is obtained from hydraulic energy

Correct : D. hydroelectric power

71. At present which is cheapest means of generating power

Correct : C. hydroelectric power

72. Pen stocks are made up of

Correct : A. steel

73. is an inward radial flow reaction turbine?

Correct : C. francis turbine

74. is a axial flow reaction turbines, if vanes are fixed to hub of turbine

Correct : A. propeller turbine

75. Francis and Kaplan turbines are known as

Correct : B. reaction turbine

76. Specific speed of reaction turbine is between?

Correct : B. 10 and 100

77. Draft tube is also called

Correct : A. straight divergent tube

78. A draft tube helps in converting kinetic energy into

Correct : B. mechanical work

79. Most common application of the draft tube is

Correct : C. pump

80. Draft tube consists of conical diffuser with angles of

Correct : A. 10 deg

81. Turbine that consists of draft tubes is called as

Correct : D. reaction turbine

82. The exit diameter for a simple elbow draft tube should be

Correct : A. large

83. The other name for elbow with varying cross section tube is called

Correct : B. bent draft tube

84. What is the efficiency of the simple elbow type draft tube?

Correct : C. 60

85. In nozzle governing, the flow rate of steam is regulated by

Correct : A. nozzles

86. The flow rate of steam is controlled by regulating the

Correct : B. pressure

87. What is the purpose of a steam turbine governing?

Correct : B. controls flow rate

88. When bypass valve is opened to

Correct : D. increase the amount of fresh steam

89. With the increase in load, Energy in the turbine

Correct : A. decreases

90. When the mechanical speed of the shaft increases beyond 110 percent, we use

Correct : D. emergency governing