Hydraulic Machines problems
- 1. Delivery head of a centrifugal pump is
Options- A. directly proportional to N
- B. inversely proportional to N
- C. directly proportional to N2
- D. inversely proportional to N2 Discuss
Correct Answer: directly proportional to N2
- 2. The specific speed of a hydraulic turbine depends upon
Options- A. speed and power developed
- B. discharge and power developed
- C. speed and head of water
- D. speed, power developed and head of water Discuss
Correct Answer: speed, power developed and head of water
- 3. Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m3, Q = Discharge of the pump in m3/s, and ?o = Overall efficiency of the pump)
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 4. By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power.The saving in case of a double acting reciprocating pump is
Options- A. 39.2%
- B. 48.8%
- C. 84.8%
- D. 88.4% Discuss
Correct Answer: 39.2%
- 5. An impulse turbine is used for
Options- A. low head of water
- B. high head of water
- C. medium head of water
- D. high discharge Discuss
Correct Answer: high head of water
- 6. In a centrifugal pump, the water enters the impeller __________ and leaves the vanes axially.
Options- A. axially
- B. radially Discuss
Correct Answer: radially
- 7. The impeller of a centrifugal pump may have
Options- A. volute casing
- B. volute casing with guide blades
- C. vortex casing
- D. any one of these Discuss
Correct Answer: any one of these
- 8. Kinematic similarity is said to exist between the model and the prototype, if both of them
Options- A. have identical velocities
- B. are equal in size and shape
- C. are identical in shape, but differ only in size
- D. have identical forces Discuss
Correct Answer: have identical velocities
- 9. In order to avoid cavitation in centrifugal pumps
Options- A. the suction pressure should be high
- B. the delivery pressure should be high
- C. the suction pressure should be low
- D. the delivery pressure should be low Discuss
Correct Answer: the suction pressure should be high
- 10. A reciprocating pump is suitable for less discharge and higher heads.
Options- A. True
- B. False Discuss
Correct Answer: True
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