Hydraulic Machines problems
- 1. Which of the following statement is correct as regard to water wheels?
Options- A. They have slow speeds.
- B. They are suitable even for low water heads.
- C. They give constant efficiency, even if the discharge is not constant
- D. all of the above Discuss
Correct Answer: all of the above
- 2. The hydraulic efficiency of an impulse turbine is the
Options- A. ratio of the actual power produced by the turbine to the energy actually supplied by the turbine
- B. ratio of the actual work available at the turbine to the energy imparted to the wheel
- C. ratio of the work done on the wheel to the energy of the jet
- D. none of the above Discuss
Correct Answer: ratio of the work done on the wheel to the energy of the jet
- 3. Which of the following statement is wrong?
Options- A. The reaction turbines are used for low head and high discharge.
- B. The angle of taper on draft tube is less than 8°.
- C. An impulse turbine is generally fitted slightly above the tail race.
- D. A Francis turbine is an impulse turbine. Discuss
Correct Answer: A Francis turbine is an impulse turbine.
- 4. The ratio of the normal force of jet of water on a plate inclined at an angle of 30° as compared to that when the plate is normal to jet, is
Options- A. 1/2
- B. 1/2
- C. 1
- D. 2 Discuss
Correct Answer: 1/2
- 5. The efficiency of a reaction turbine for a given head __________ with the increase in speed.
Options- A. decreases
- B. increases Discuss
Correct Answer: decreases
- 6. Which of the following pump is successfully used for lifting water from deep wells?
Options- A. Centrifugal pump
- B. Reciprocating pump
- C. Jet pump
- D. Air lift pump Discuss
Correct Answer: Air lift pump
- 7. A double overhung Pelton wheel has
Options- A. two jets
- B. two runners
- C. four jets
- D. four runners Discuss
Correct Answer: two runners
- 8. Mechanical efficiency of a centrifugal pump is the ratio of
Options- A. energy available at the impeller to the energy supplied to the pump by the prime mover
- B. actual workdone by the pump to the energy supplied to the pump by the prime mover
- C. energy supplied to the pump to the energy available at the impeller
- D. manometric head to the energy supplied by the impeller per kN of water Discuss
Correct Answer: energy available at the impeller to the energy supplied to the pump by the prime mover
- 9. The specific speed (Ns) of a centrifugal pump is given by
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 10. Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?
Options- A. Pelton wheel
- B. Francis turbine
- C. Kaplan turbine
- D. none of these Discuss
Correct Answer: Francis turbine
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