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Hydraulic Machines
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Question
The unit speed of the turbine runner is
Options
A.
B.
C.
D.
Correct Answer
Hydraulic Machines problems
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1. A reciprocating pump is also called a __________ displacement pump.
Options
A. positive
B. negative
Show Answer
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Correct Answer: positive
2. 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
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Correct Answer: pressure
3. 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
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Correct Answer: to bring the runner to rest in a short time
4. 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.
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Correct Answer: In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure.
5. 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
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Correct Answer: difference
6. 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
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Correct Answer: geometric similarity
7. 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
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Correct Answer: proportional to diameter and speed of impeller
8. The air vessel, in a reciprocating pump, is a cast iron closed chamber having an opening at its base.
Options
A. Agree
B. Disagree
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Correct Answer: Agree
9. The function of guide vanes in a reaction turbine is to
Options
A. allow the water to enter the runner without shock
B. allow the water to flow over them, without forming eddies
C. allow the required quantity of water to enter the turbine
D. all of the above
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Correct Answer: all of the above
10. The number of buckets on the periphery of a Pelton wheel is given by
Options
A.
B.
C.
D.
Show Answer
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Correct Answer:
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