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Mechanical Engineering
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Hydraulic Machines
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Question
A Francis turbine is an outward flow reaction turbine.
Options
A. True
B. False
Correct Answer
False
Hydraulic Machines problems
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1. The head available at the inlet of the turbine is known as net or effective head.
Options
A. Correct
B. Incorrect
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Correct Answer: Correct
2. The Furneyron turbine is __________ reaction turbine.
Options
A. an axial flow
B. an inward flow
C. an outward flow
D. a mixed flow
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Correct Answer: an outward flow
3. 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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Correct Answer: low pressure
4. 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
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Correct Answer: 0.15 to 0.3
5. The Thomson's turbine is __________ reaction turbine.
Options
A. an axial flow
B. an inward flow
C. an outward flow
D. a mixed flow
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Correct Answer: an inward flow
6. Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?
Options
A. Hydraulic ram
B. Hydraulic intensifier
C. Hydraulic torque converter
D. Hydraulic accumulator
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Correct Answer: Hydraulic torque converter
7. In an axial flow reaction turbine, the water flows __________ to the axis of the wheel.
Options
A. parallel
B. perpendicular
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Correct Answer: parallel
8. 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
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Correct Answer: 0.85 to 0.90
9. 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
10. 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.
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