The undershot water wheels are those in which the wheel runs entirely by the wei

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Question
The undershot water wheels are those in which
Options
A. the wheel runs entirely by the weight of water
B. the wheel runs entirely by the impulse of water
C. the wheel runs partly by the weight of water and partly by the impulse of water
D. none of the above

Correct Answer

the wheel runs entirely by the impulse of water

Hydraulic Machines problems

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2. 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

4. 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

5. 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

6. A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used?
Options
A. Pelton wheel with one nozzle
B. Pelton wheel with two or more nozzles
C. Kaplan turbine
D. Francis turbine

8. The jet ratio is defined as the ratio of the
Options
A. diameter of jet to the diameter of Pelton wheel
B. velocity of jet to the velocity of Pelton wheel
C. diameter of Pelton wheel to the diameter of jet
D. velocity of Pelton wheel to the velocity of jet

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