Discussion
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- Question
The efficiency of a centrifugal pump will be maximum when the blades are bent backward.
Options- A. Yes
- B. No
- Correct Answer
- Yes
- 1. 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
- 2. 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
- 3. The overshot water wheels are those in which the wheel runs entirely by the __________ of water.
Options- A. weight
- B. impulse Discuss
- 4. 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 Discuss
- 5. 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
- 6. 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
- 7. The capacity of a hydraulic accumulator is generally specified as the maximum amount of energy stored.
Options- A. True
- B. False Discuss
- 8. In a reciprocating pump, air vessels are fitted to the suction pipe and delivery pipe close to the cylinder of the pump.
Options- A. True
- B. False Discuss
- 9. Multi-stage centrifugal pumps are used to
Options- A. give high discharge
- B. produce high heads
- C. pump viscous fluids
- D. all of these Discuss
- 10. The breast water wheels are those in which the wheel runs partly by the weight of water and partly by the impulse of water.
Options- A. True
- B. False Discuss
Hydraulic Machines problems
Search Results
Correct Answer: H = Hg - hf
Correct Answer: power produced by the turbine to the energy actually supplied by the turbine
Correct Answer: weight
Correct Answer: ratio of the actual work available at the turbine to the energy imparted to the wheel
Correct Answer: specific speed
Correct Answer: to increase the head of water by an amount equal to the height of the runner outlet above the tail race
Correct Answer: True
Correct Answer: True
Correct Answer: produce high heads
Correct Answer: True
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