Discussion
Home ‣ Mechanical Engineering ‣ Hydraulic Machines Comments
- Question
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
- Correct Answer
- all of the above
- 1. A hydraulic intensifier is a device used to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure.
Options- A. Correct
- B. Incorrect Discuss
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. 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
- 9. The efficiency of a reaction turbine for a given head __________ with the increase in speed.
Options- A. decreases
- B. increases Discuss
- 10. 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
Hydraulic Machines problems
Search Results
Correct Answer: Correct
Correct Answer: one-half
Correct Answer:
Correct Answer: Agree
Correct Answer: dynamic similarity
Correct Answer: ratio of the work done on the wheel to the energy of the jet
Correct Answer: A Francis turbine is an impulse turbine.
Correct Answer: 1/2
Correct Answer: decreases
Correct Answer: Air lift pump
Comments
There are no comments.More in Mechanical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.