Hydraulic Machines problems
- 1. The overall efficiency for a Pelton wheel lies between
Options- A. 0.50 to 0.65
- B. 0.65 to 0.75
- C. 0.75 to 0.85
- D. 0.85 to 0.90 Discuss
Correct Answer: 0.85 to 0.90
- 2. The gross or total head of the turbine is the __________ of the water levels at the head race and tail race.
Options- A. sum
- B. difference
- C. product Discuss
Correct Answer: difference
- 3. Which of the following statement is correct?
Options- A. In an impulse turbine, the water impinges on the buckets with pressure energy.
- B. In a reaction turbine, the water glides over the moving vanes with kinetic energy.
- C. In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure.
- D. In a reaction turbine, the pressure of the flowing water increases after gliding over the vanes. Discuss
Correct Answer: In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure.
- 4. Braking jet in an impulse turbine is used
Options- A. to break the jet of water
- B. to bring the runner to rest in a short time
- C. to change the direction of runner
- D. none of these Discuss
Correct Answer: to bring the runner to rest in a short time
- 5. A hydraulic accumulator is a device used to store __________ energy which may be supplied to a machine later on.
Options- A. strain
- B. pressure
- C. kinetic Discuss
Correct Answer: pressure
- 6. A reciprocating pump is also called a __________ displacement pump.
Options- A. positive
- B. negative Discuss
Correct Answer: positive
- 7. The unit speed of the turbine runner is
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 8. If the ratio of all the corresponding linear dimensions are equal, then the model and the prototype are said to have
Options- A. geometric similarity
- B. kinematic similarity
- C. dynamic similarity
- D. none of these Discuss
Correct Answer: geometric similarity
- 9. Head developed by a centrifugal pump is
Options- A. proportional to diameter of impeller
- B. proportional to speed of impeller
- C. proportional to diameter and speed of impeller
- D. none of the above Discuss
Correct Answer: proportional to diameter and speed of impeller
- 10. The air vessel, in a reciprocating pump, is a cast iron closed chamber having an opening at its base.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
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