Discussion
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- Question
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
- Correct Answer
- one-third
- 1. 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
- 2. 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
- 3. 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
- 4. Which of the following is not a reaction turbine?
Options- A. Furneyron turbine
- B. Jonval turbine
- C. Thomson's turbine
- D. Pelton wheel Discuss
- 5. The power of a centrifugal pump working under constant head and discharge increases with the speed.
Options- A. True
- B. False Discuss
- 6. The action of a centrifugal pump is that of a reversed reaction turbine.
Options- A. Correct
- B. Incorrect Discuss
- 7. For 450 m head of water, __________ shallbeused.
Options- A. Pelton wheel
- B. Kaplan turbine
- C. Francis turbine
- D. none of these Discuss
- 8. 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
- 9. 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 Discuss
- 10. 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
Hydraulic Machines problems
Search Results
Correct Answer:
Correct Answer: slow speed pump with radial flow at outlet
Correct Answer: all of the above
Correct Answer: Pelton wheel
Correct Answer: True
Correct Answer: Correct
Correct Answer: Pelton wheel
Correct Answer: at which the turbine will run freely without load
Correct Answer: five times
Correct Answer: cavitation will be formed
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