Discussion
Home ‣ Mechanical Engineering ‣ Hydraulic Machines Comments
- Question
The mechanical efficiency of an impulse turbine is
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
- Correct Answer
- ratio of the actual work available at the turbine to the energy imparted to the wheel
- 1. The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as
Options- A. normal speed
- B. unit speed
- C. specific speed
- D. none of these Discuss
- 2. The power produced by the reaction turbine is __________ to the head of water.
Options- A. directly proportional
- B. inversely proportional Discuss
- 3. The principle of jet propulsion is used in driving the ships and aeroplanes.
Options- A. Correct
- B. Incorrect Discuss
- 4. Work done by a turbine __________ upon the weight of water flowing per second.
Options- A. depends
- B. does not depend Discuss
- 5. Which of the following turbine is preferred for 0 to 25 m head of water?
Options- A. Pelton wheel
- B. Kaplan turbine
- C. Francis turbine
- D. none of these Discuss
- 6. The overshot water wheels are those in which the wheel runs entirely by the __________ of water.
Options- A. weight
- B. impulse Discuss
- 7. The overall efficiency of a reaction turbine is the ratio of
Options- A. power produced by the turbine to the energy actually supplied by the turbine
- B. actual work available at the turbine to the energy imparted to the wheel
- C. workdone on the wheel to the energy (or head of water) actually supplied to the turbine
- D. none of the above Discuss
- 8. If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by
Options- A. H = Hg/hf
- B. H = Hg x hf
- C. H = Hg + hf
- D. H = Hg - hf Discuss
- 9. The efficiency of a centrifugal pump will be maximum when the blades are bent backward.
Options- A. Yes
- B. No Discuss
- 10. In a reaction turbine, the draft tube is used
Options- A. to run the turbine full
- B. to prevent air to enter the turbine
- C. to increase the head of water by an amount equal to the height of the runner outlet above the tail race
- D. to transport water to downstream Discuss
Hydraulic Machines problems
Search Results
Correct Answer: specific speed
Correct Answer: directly proportional
Correct Answer: Correct
Correct Answer: depends
Correct Answer: Kaplan turbine
Correct Answer: weight
Correct Answer: power produced by the turbine to the energy actually supplied by the turbine
Correct Answer: H = Hg - hf
Correct Answer: Yes
Correct Answer: to increase the head of water by an amount equal to the height of the runner outlet above the tail race
Comments
There are no comments.More in Mechanical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.