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Mechanical Engineering
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Hydraulic Machines
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Question
A hydraulic accumulator is a device used to store __________ energy which may be supplied to a machine later on.
Options
A. strain
B. pressure
C. kinetic
Correct Answer
pressure
Hydraulic Machines problems
Search Results
1. Braking jet in an impulse turbine is used
Options
A. to break the jet of water
B. to bring the runner to rest in a short time
C. to change the direction of runner
D. none of these
Show Answer
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Correct Answer: to bring the runner to rest in a short time
2. Which of the following statement is correct?
Options
A. In an impulse turbine, the water impinges on the buckets with pressure energy.
B. In a reaction turbine, the water glides over the moving vanes with kinetic energy.
C. In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure.
D. In a reaction turbine, the pressure of the flowing water increases after gliding over the vanes.
Show Answer
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Correct Answer: In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure.
3. The gross or total head of the turbine is the __________ of the water levels at the head race and tail race.
Options
A. sum
B. difference
C. product
Show Answer
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Correct Answer: difference
4. The overall efficiency for a Pelton wheel lies between
Options
A. 0.50 to 0.65
B. 0.65 to 0.75
C. 0.75 to 0.85
D. 0.85 to 0.90
Show Answer
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Discuss
Correct Answer: 0.85 to 0.90
5. In an axial flow reaction turbine, the water flows __________ to the axis of the wheel.
Options
A. parallel
B. perpendicular
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Discuss
Correct Answer: parallel
6. A reciprocating pump is also called a __________ displacement pump.
Options
A. positive
B. negative
Show Answer
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Correct Answer: positive
7. The unit speed of the turbine runner is
Options
A.
B.
C.
D.
Show Answer
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Discuss
Correct Answer:
8. If the ratio of all the corresponding linear dimensions 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
Show Answer
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Correct Answer: geometric similarity
9. Head developed by a centrifugal pump is
Options
A. proportional to diameter of impeller
B. proportional to speed of impeller
C. proportional to diameter and speed of impeller
D. none of the above
Show Answer
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Correct Answer: proportional to diameter and speed of impeller
10. The air vessel, in a reciprocating pump, is a cast iron closed chamber having an opening at its base.
Options
A. Agree
B. Disagree
Show Answer
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Correct Answer: Agree
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