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Hydraulic Machines
Comments
Question
The discharge through a turbine is
Options
A. directly proportional to
H
1/2
B. inversely proportional to
H
1/2
C. directly proportional to
H
3/2
D. inversely proportional to
H
3/2
Correct Answer
directly proportional to
H
1/2
Hydraulic Machines problems
Search Results
1. Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?
Options
A. Pelton wheel
B. Francis turbine
C. Kaplan turbine
D. none of these
Show Answer
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Discuss
Correct Answer: Francis turbine
2. The specific speed (
N
s
) of a centrifugal pump is given by
Options
A.
B.
C.
D.
Show Answer
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Discuss
Correct Answer:
3. Mechanical efficiency of a centrifugal pump is the ratio of
Options
A. energy available at the impeller to the energy supplied to the pump by the prime mover
B. actual workdone by the pump to the energy supplied to the pump by the prime mover
C. energy supplied to the pump to the energy available at the impeller
D. manometric head to the energy supplied by the impeller per kN of water
Show Answer
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Discuss
Correct Answer: energy available at the impeller to the energy supplied to the pump by the prime mover
4. A double overhung Pelton wheel has
Options
A. two jets
B. two runners
C. four jets
D. four runners
Show Answer
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Discuss
Correct Answer: two runners
5. 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
Show Answer
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Discuss
Correct Answer: Air lift pump
6. The efficiency of a hydraulic press is given by (where
W
= Weight lifted by ram,
P
= Force applied on plunger,
A
= Area of ram, and
a
= Area of plunger)
Options
A.
B.
C.
D.
Show Answer
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Discuss
Correct Answer:
7. The Thomson's turbine is __________ reaction turbine.
Options
A. an axial flow
B. an inward flow
C. an outward flow
D. a mixed flow
Show Answer
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Discuss
Correct Answer: an inward flow
8. The flow ratio in case of Francis turbine varies from
Options
A. 0.15 to 0.3
B. 0.4 to 0.5
C. 0.6 to 0.9
D. 1 to 1.5
Show Answer
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Correct Answer: 0.15 to 0.3
9. The cavitation in a hydraulic machine is mainly due to
Options
A. low velocity
B. high velocity
C. low pressure
D. high pressure
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Discuss
Correct Answer: low pressure
10. The Furneyron turbine is __________ reaction turbine.
Options
A. an axial flow
B. an inward flow
C. an outward flow
D. a mixed flow
Show Answer
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Discuss
Correct Answer: an outward flow
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