Quiznetik

Fluid Mechanics (FM) | Set 9

1. The draft tube at the exit of the nozzle increases the

Correct : B. Pressure

2. Efficiency of a draft tube gives

Correct : C. Kinetic energy difference

3. Cavitation in a draft tube occurs when

Correct : B. Pressure drop

4. Which among the following is an important parameter to avoid cavitation?

Correct : C. Height of draft tube

5. The draft tube is situated in the

Correct : B. Outlet

6. Which equation is applied to determine the flow?

Correct : C. Bernoulli’s equation

7. Height of the draft tube is denoted by

Correct : C. z

8. Draft tube allows turbine to be placed above the tail race.

Correct : A. True

9. The efficiency of the draft tube depends on the

Correct : D. Pressure and temperature

10. Draft tubes have shafts

Correct : B. Vertical

11. Draft tubes are situated at the outlet in

Correct : A. Pelton

12. Efficiency of a draft tube is directly proportional to its

Correct : C. Velocity

13. Z is a draft tube is

Correct : D. Datum head

14. Draft tube operates at

Correct : A. Same efficiency

15. The draft tube is an

Correct : B. Exterior tube

16. What type of pressure does the draft tube depend upon?

Correct : A. Gauge pressure

17. Gauge pressure of the draft tube is denoted by

Correct : A. P

18. Draft tube allows turbine to be placed below the tail race.

Correct : B. False

19. Specific speed is denoted by

Correct : C. Ns

20. Specific speeds are used in pumps to determine

Correct : C. Suction specific speed

21. The tube at the exit of the nozzle increases the

Correct : B. Pressure

22. Specific speed is used to characterize

Correct : A. Turbomachinery speed

23. Specific speed predicts the shape of a/an

Correct : C. Impeller

24. What helps in categorizing the impellers?

Correct : A. Quasi static number

25. Imperial units is defined as

Correct : C. Revolutions per minute

26. Ratio of pump or turbine with reference pump or turbine is called as

Correct : B. Performance

27. Low specific speed in hydraulic head is developed due to

Correct : C. Centrifugal force

28. Centrifugal pump impellers have speed ranging from

Correct : A. 500- 10000

29. What is the unit of specific speed in metric system?

Correct : C. m3/s

30. Specific speed develop a hydraulic flow through the centrifugal pumps.

Correct : A. True

31. Net suction speed is used in problems with cavitation.

Correct : A. True

32. The runner diameter in a turbine is denoted as

Correct : D. De

33. Specific speed is the speed of the turbine which is similar to its

Correct : C. Aspect ratio

34. Specific speed develops a unit power under a unit

Correct : D. Head

35. Impeller in a motor is used to

Correct : B. Change Pressure

36. Hydraulic head is also called as

Correct : D. Piezometric head

37. Specific speed of a Pelton wheel with single jet is

Correct : A. 8.5 to 30

38. Specific speed is an index used to predict

Correct : D. Turbine performance

39. Specific speed of a Pelton wheel with multiple jets is

Correct : B. 30 to 51

40. Specific speed of a Francis turbine is

Correct : C. 51 to 225

41. Specific speed of a Kaplan turbine is

Correct : D. 355 to 860

42. Specific speed less than 500 are called

Correct : A. Positive displacement pumps

43. With the increase in specific speeds,

Correct : D. Diameters of impeller increases

44. Specific speed is used to predict desired pump or turbine performance.

Correct : A. True

45. Once we know the desired functions of the specific speed, it is easier to calculate its components units.

Correct : A. True

46. Which among the following is not a unit quantity of turbine?

Correct : D. Unit temperature

47. What does DMU stand for?

Correct : B. Direct material usage

48. Unit speed is the speed of the turbine operating under_

Correct : A. One-meter head

49. One dyne is equal to N.

Correct : D. 10-5

50. What is symbol for unit speed?

Correct : D. Nu

51. Unit speed of a single jet in a turbine is

Correct : D. 800 m/s

52. Unit speed is directly proportional to

Correct : B. Specific speed

53. Unit discharge is the discharge through the turbine when the head of the turbine is

Correct : C. Unity

54. 9 Unit discharge is denoted as

Correct : B. Qu

55. Unit discharge is directly proportional to

Correct : B. Discharge of fluid in the turbine.

56. Unit quantities are physical quantities

Correct : B. Without numerical variables

57. Dyne cm is a Torque measurement unit.

Correct : A. True

58. Unit quantities play an important role in determining the dimensional quantities.

Correct : A. True

59. Unit power is developed by the turbine when the head of the turbine is unity.

Correct : A. True

60. Constant head curves are also called as

Correct : C. Main characteristic curves

61. The speed of the turbine in a constant head curve is varied by

Correct : C. Changing the gate opening

62. Constant speed curves travel at constant speed when the value is equal to

Correct : B. 1

63. Power of a turbine is measured

Correct : A. Mechanically

64. Which among the following is not a parameter to determine the efficiency of the turbine?

Correct : C. Unit volume

65. Which among the following is not an important parameter to determine the performance of the turbine?

Correct : D. Volume of tank

66. Which among the following is not a type of curve?

Correct : C. Pressure vs power

67. The inlet passage of water entry is controlled by

Correct : B. Gate

68. Overall efficiency vs what is drawn to determine the turbine performance?

Correct : B. Unit speed

69. Constant discharge takes place due to

Correct : B. Unit speed

70. All the characteristic curves are drawn with respect to

Correct : B. Unit speed

71. In constant speed curves, the speed is kept a constant varying its head.

Correct : A. True

72. In all the characteristic curves, the overall efficiency is aimed at the maximum value.

Correct : A. True

73. Constant efficiency curves are plotted using

Correct : D. Constant speed and constant head

74. Constant speed curves are also called as

Correct : C. Tail race curves

75. Constant speed curve is denoted as

Correct : C. c

76. Constant speed curves are

Correct : B. Vector quantities

77. Constant speed is measured

Correct : A. Mechanically

78. Constant speed curves are determined by the

Correct : C. Heat

79. Which component is necessary for writing the velocity equation?

Correct : C. Cos and sine component

80. Which among the following is not a shape for a curve?

Correct : D. Speed curve

81. How do we plot points in a curve?

Correct : A. Analytical approach

82. Plotting sine curve will take place along the

Correct : B. x axis

83. In analytical approach, dp=

Correct : A. vdt

84. The equation is general approach is called as central difference.

Correct : A. True

85. The approximate value of the constant speed curve is given by ratio of

Correct : A. dy/dp

86. In constant speed curves, the velocity is kept a constant varying its head.

Correct : B. False

87. The performance of a characteristic curve is kept at a high value.

Correct : A. True

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

Correct : A. Nozzles

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

Correct : B. Pressure

90. What is primary objective of steam turbine governing?

Correct : A. Maintain constant speed

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

Correct : B. Controls flow rate

92. The advantage of nozzle governing is that no regulating pressure is applied.

Correct : A. True

93. During the steam turbine governing, what remains a constant?

Correct : A. Speed of rotation

94. When do we apply by pass governing?

Correct : A. When turbine is overloaded

95. When bypass valve is opened to

Correct : D. Increase the amount of fresh steam

96. What is the unit of steam rate?

Correct : C. kg/kWh

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

Correct : A. Decreases

98. Combination governing involves usage of two or more governing.

Correct : A. True

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

Correct : D. Emergency governing

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

Correct : D. Emergency governing