Hydraulic Machines problems
- 1. Which of the following pump is successfully used for lifting water to the turbines?
Options- A. Centrifugal pump
- B. Reciprocating pump
- C. Jet pump
- D. Air lift pump Discuss
Correct Answer: Jet pump
- 2. The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is
Options- A. slow speed with radial flow at outlet
- B. medium speed with radial flow at outlet
- C. high speed with radial flow at outlet
- D. high speed with mixed flow at outlet Discuss
Correct Answer: high speed with mixed flow at outlet
- 3. The speed ratio in case of Francis turbine varies from
Options- A. 0.15 to 0.3
- B. 0.4 to 0.5
- C. 0.6 to 0.9
- D. 1 to 1.5 Discuss
Correct Answer: 0.6 to 0.9
- 4. The power of a centrifugal pump working under constant head and discharge increases with the speed.
Options- A. True
- B. False Discuss
Correct Answer: True
- 5. Which of the following is not a reaction turbine?
Options- A. Furneyron turbine
- B. Jonval turbine
- C. Thomson's turbine
- D. Pelton wheel Discuss
Correct Answer: Pelton wheel
- 6. The cavitation in a hydraulic machine
Options- A. causes noise and vibration of various parts
- B. reduces the discharge of a turbine
- C. causes sudden drop in power output and efficiency
- D. all of the above Discuss
Correct Answer: all of the above
- 7. The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is
Options- A. slow speed pump with radial flow at outlet
- B. medium speed pump with radial flow at outlet
- C. high speed pump with radial flow at outlet
- D. high speed pump with axial flow at outlet Discuss
Correct Answer: slow speed pump with radial flow at outlet
- 8. The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 9. A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is __________ of the jet velocity
Options- A. one-half
- B. one-third
- C. two-third
- D. three-fourth Discuss
Correct Answer: one-third
- 10. The action of a centrifugal pump is that of a reversed reaction turbine.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
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