Discussion
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- Question
The width of the bucket for a Pelton wheel is generally __________ the diameter of jet.
Options- A. double
- B. three times
- C. four times
- D. five times
- Correct Answer
- five times
- 1. The runaway speed of a hydraulic turbine is the speed
Options- A. at full load
- B. at which there will be no damage to the runner
- C. corresponding to maximum overload permissible
- D. at which the turbine will run freely without load Discuss
- 2. For 450 m head of water, __________ shallbeused.
Options- A. Pelton wheel
- B. Kaplan turbine
- C. Francis turbine
- D. none of these Discuss
- 3. The action of a centrifugal pump is that of a reversed reaction turbine.
Options- A. Correct
- B. Incorrect Discuss
- 4. 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
- 5. 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
- 6. If the net positive suction head (NPSH) requirement for the pump is not satisfied, then
Options- A. no flow will take place
- B. cavitation will be formed
- C. efficiency will be low
- D. excessive power will be consumed Discuss
- 7. Which of the following statement is correct?
Options- A. The centrifugal pump is suitable for large discharge and smaller heads.
- B. The centrifugal pump requires less floor area and simple foundation as compared to reciprocating pump.
- C. The efficiency of centrifugal pump is less as compared to reciprocating pump.
- D. all of the above Discuss
- 8. The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which
Options- A. delivers unit discharge under unit head
- B. delivers unit discharge under unit speed
- C. develops unit power under unit head
- D. develops unit power under unit speed Discuss
- 9. A Kaplan turbine is preferred for a specific speed of 300 to 1000 r.p.m.
Options- A. Yes
- B. No Discuss
- 10. A turbine develops 10000 kW under a head of 25 metres at 135 r.p.m. Its specific speed is
Options- A. 175.4 r.p.m.
- B. 215.5 r.p.m.
- C. 241.5 r.p.m.
- D. 275.4 r.p.m Discuss
Hydraulic Machines problems
Search Results
Correct Answer: at which the turbine will run freely without load
Correct Answer: Pelton wheel
Correct Answer: Correct
Correct Answer: one-third
Correct Answer:
Correct Answer: cavitation will be formed
Correct Answer: all of the above
Correct Answer: develops unit power under unit head
Correct Answer: Yes
Correct Answer: 241.5 r.p.m.
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