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- Question
The cavitation in reaction turbines is avoided, to a great extent by
Options- A. installing the turbine below the tail race level
- B. using stainless steel runner of the turbine
- C. providing highly polished blades to the runner
- D. all of the above
- Correct Answer
- all of the above
- 1. In a mixed flow centrifugal pump, the flow through the impeller is a combination of radial and axial flows.
Options- A. Correct
- B. Incorrect Discuss
- 2. A Kaplan turbine is an axial flow reaction turbine.
Options- A. Correct
- B. Incorrect Discuss
- 3. A hydraulic ram is a device used to
Options- A. store the energy of water
- B. increase the pressure of water
- C. to lift water from deep wells
- D. to lift small quantity of water to a greater height when a large quantity of water is available at a smaller height Discuss
- 4. Overall 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
- 5. In a mixed flow reaction turbine, the flow of water is partly radial and partly axial.
Options- A. Correct
- B. Incorrect Discuss
- 6. Dynamic similarity is said to exist between the model and the prototype, if both of them
Options- A. have identical velocities
- B. are equal in size and shape
- C. are identical in shape, but differ only in size
- D. none of the above Discuss
- 7. If the ratio's of the corresponding forces acting at corresponding points 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
- 8. If the Francis turbine is run below 50 percent head for a long period, it will not only lose its efficiency but also the cavitation danger will become more serious.
Options- A. Agree
- B. Disagree Discuss
- 9. If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is
Options- A.
- B.
- C.
- D.
Discuss
- 10. The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is __________ of the jet velocity,
Options- A. one-fourth
- B. one-half
- C. three-fourth
- D. double Discuss
Hydraulic Machines problems
Search Results
Correct Answer: Correct
Correct Answer: Correct
Correct Answer: to lift small quantity of water to a greater height when a large quantity of water is available at a smaller height
Correct Answer: actual workdone by the pump to the energy supplied to the pump by the prime mover
Correct Answer: Correct
Correct Answer: none of the above
Correct Answer: dynamic similarity
Correct Answer: Agree
Correct Answer:
Correct Answer: one-half
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