Quiznetik

Fluid Mechanics (FM) | Set 5

1. Which of the following is taken into account during a characteristic curve?

Correct : A. Flow rate

2. As the specific speed increases, the slope of HQ curve

Correct : C. Independent

3. The primary selection tool is called as

Correct : A. Pump curve

4. Voids are created due to

Correct : C. Liquid free layers

5. Cavitation usually occurs due to the changes in

Correct : A. Pressure

6. Degree of reactions are most commonly used in

Correct : A. Turbomachinery

7. At high pressure, the voids can generate

Correct : C. Shock waves

8. Voids that implode near metal surface develops a

Correct : B. Cyclic stress

9. Internal cavitation occurs due to

Correct : C. Shock waves

10. The velocities of the blade angles can be found out using

Correct : C. Velocity triangles

11. Hydrodynamic cavitation is due to the process of

Correct : A. Vaporisation

12. The process of bubble generation leads to

Correct : C. High energy densities

13. Reciprocating pump is a

Correct : B. Positive displacement pump

14. What happens to the reciprocating pump when left untouched?

Correct : C. Surface expansion

15. Reciprocating pumps operate by drawing into the chamber

Correct : A. Liquid

16. The cylinder of reciprocating cylinder is made up of

Correct : A. Cast iron

17. The higher discharge valve line holds the discharge valve

Correct : B. Closed

18. Reciprocating pumps are also called as

Correct : A. Force pumps

19. Reciprocating pumps are classified according to

Correct : B. Number of cylinders

20. Simple hand operating pump is also called as

Correct : B. Bicycle pump

21. Power operated pump in which only one side engages the fluid displacement is called

Correct : B. Single acting

22. Operation of reciprocating motion is done by a source

Correct : A. Power

23. An up and down back and forth relative linear motion is called

Correct : A. Reciprocation

24. Power operated pump in which only both sides engage the fluid displacement is called

Correct : C. Double acting

25. The two opposite motion that comprise a single reciprocation is called

Correct : A. Turbocharger

26. Reciprocating pumps has efficiency compared to centrifugal pumps

Correct : B. Lower

27. Reciprocating pumps works on the principle of

Correct : B. Liquid flow push

28. Reciprocating pump is a type of

Correct : A. Positive displacement pump

29. During the suction stroke the moves left thus creating vacuum in the Cylinder.

Correct : A. Piston

30. When both the sources are effective it is called as

Correct : A. Double acting pump

31. A repetitive variation about the central value of equilibrium is called

Correct : B. Oscillation

32. A linear wheel turning motion is called as a

Correct : B. Rotation

33. A reciprocating pump that has 1200 crank is

Correct : D. Triple acting View Answer

34. In a positive displacement pump, what gets displaced?

Correct : B. Volume

35. What happens to the reciprocating pump when left untouched?

Correct : C. Surface expansion

36. Positive displacement pumps are capable of developing pressures, in suction pressure.

Correct : A. High, low

37. When is a reciprocating pump used?

Correct : A. When quantity of liquid is small

38. Positive displacement pumps are also called as_

Correct : C. Constant volume pumps

39. In centrifugal pumps, their capacity is affected due to

Correct : D. Pressure View Answer

40. A quantity of fluid that leaks from a higher pressure discharge to a lower pressure discharge is called

Correct : A. Slip

41. Positive displacement pumps regulate the flow by varying its

Correct : D. Flow speed View Answer

42. Simplest example of single acting reciprocating pump is

Correct : D. Syringe View Answer

43. Rotary pumps do not function well under

Correct : C. High viscosity

44. The parameter that disturbs the working of the rotary pump is_

Correct : C. Low flow rate

45. Rotary pumps are commonly used to circulate_

Correct : A. Lube oils

46. Capacity of a rotary pump is defined as

Correct : A. Total liquid displaced

47. What type of flow does the reciprocating pump have?

Correct : B. Continuous

48. What is the full form of PD?

Correct : A. Positive displacement

49. Why can’t rotary pumps non-lubricate water?

Correct : B. Because it contains abrasive particles

50. The maximum speed of reciprocating pump is

Correct : B. 30m/min

51. The pump that uses a relatively smaller amount of liquid is called

Correct : B. Reciprocating pump

52. Sliding vanes in pumps are held by

Correct : C. Springs

53. Air vessel accumulates excess quantity of

Correct : B. Water

54. In which pump is the liquid in contact with both the sides of the plunger

Correct : C. Double acting

55. When a cylinder has inlet and outlet ports at each end, then it is called as

Correct : A. Double acting

56. Turbomachines work under

Correct : B. Newtons second law

57. The main function of nozzle is to

Correct : B. Pressure variations

58. When the piston moves forward, liquid is drawn

Correct : A. Into the cylinder

59. In a reciprocating pump, with the change in discharge pressure,

Correct : C. Volume delivered remains the same

60. The amount of fluid that leaks internally is called

Correct : B. Slip

61. For a good condition, slip should be_

Correct : A. Below 1 percent

62. If the slip is above 5 percent, the pumps needs to be

Correct : B. Overhauled

63. Slip in a pump depends on which of following parameters?

Correct : A. Wear

64. Internal breakage in a pump mainly takes place when

Correct : A. Discharge pressure is increased

65. The output that we get after an internal breakage can be classed as

Correct : C. Constant

66. When the hydraulic fluid forms on only one side of the piston, it is called

Correct : A. Single acting pump

67. A pump with two steams and two water cylinders is called

Correct : D. Duplex pump View Answer

68. When an external force is not available in a pump, we use a

Correct : A. Hydraulic cylinder

69. Reciprocating pumps give a flow

Correct : C. Pulsating

70. Suction stroke becomes difficult to pump

Correct : B. Viscous fluids

71. Piston pumps are very

Correct : A. Expensive

72. What is the full form of DAC?

Correct : B. Double acting pumps

73. Which among the following is not a multi-cylinder pump?

Correct : A. Double acting simplex

74. A pressure vessel is used to hold

Correct : B. Gases

75. A tank that is used to protect closed water heating systems is called

Correct : B. Expansion vessel

76. How is the construction of the vessel tested?

Correct : D. Non-destructive testing View Answer

77. Where is the excess quantity of water from the pump accumulated?

Correct : C. Air vessels

78. What is the shape of a pressure vessel?

Correct : D. All the shapes View Answer

79. Pressure vessel closures are used to

Correct : C. Retain structures

80. The main function of nozzle is to

Correct : B. Pressure variations

81. Which among the following control the flow rate?

Correct : A. Valve

82. Force exerted by a jet on a stationery plate happens in how many cases?

Correct : A. 3 cases

83. Force exerted by a jet on a moving plate happens in how many cases?

Correct : A. 3 cases

84. In a stationery vertical plate, the jet after striking the plate will move

Correct : B. Along the plate

85. At what angle does the jet deflect after striking a stationery vertical plate?

Correct : C. 90

86. The velocity component after striking the surface will be_

Correct : B. Zero

87. Which among the following is the formula for Force when it strikes the plate?

Correct : A. pav2

88. To derive pav2, we take final velocity minus the initial velocity.

Correct : B. False

89. The mass of water per sec striking the plate is

Correct : B. pav

90. Which among the following is formula for force when it acts along the direction of flow?

Correct : A. pav2Sin2θ

91. Which among the following is a formula for force when it acts perpendicular to the direction of flow?

Correct : A. pav2 SinθCosθ

92. A jet strikes a curved plate at its

Correct : C. Centre

93. During a weak jump, the value of Froude lies in between

Correct : A. 1 to 2.5

94. During an oscillating jump, the value of Froude lies in between

Correct : A. 1 to 2.5

95. A jet after striking a smooth plate comes out with a velocity.

Correct : C. Same

96. Component of velocity in direction of jet is -VCosθ

Correct : A. True

97. Jet propulsion is a method of generating propulsive force by reaction of

Correct : A. Accelerating mass

98. The propulsive force drives the jet in the

Correct : B. Forward direction

99. Jet propulsion works on the principle of

Correct : C. Newton’s third law

100. What does Cv in jet propulsion equation stand for?

Correct : D. Velocity coefficient