The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which

Mechanical Engineering : Hydraulic Machines - Quiz(MCQ)

develops unit power under unit head

develops unit power under unit speed

delivers unit discharge under unit head

delivers unit discharge under unit speed

Correct Answer : Option (A) : develops unit power under unit head

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It is given that the input water power of the Kaplan turbine is 1.10 times the runner power. What would be the hydraulic efficiency of the turbine (in %)?

70.71

80.81

90.91

100.00

Correct Answer : 90.91

Explanation : The definition of Hydraulic efficiency in a Kaplan turbine states that it is the ratio between the Runner power to the shaft power. If input water power is 1.10 times the runner power, the runner power is 1/1.10 = 0.90909 Times the water power. Hence, hydraulic efficiency = 90.91%.

Which of the following efficiencies for Kaplan Turbine is described as the ratio between the power produced by runner to the power supplied by water at the inlet?

Overall efficiency

Volumetric efficiency

Mechanical efficiency

Hydraulic efficiency

Correct Answer : Hydraulic efficiency

Explanation : The definition of Hydraulic efficiency in a Kaplan turbine states that it is the ratio between the Runner power to the shaft power. Hence, the correct option is Hydraulic efficiency.

Which of the following turbines will have the lowest number of blades in it?

Kaplan turbine

Steam turbine

Pelton turbine

Francis turbine

Correct Answer : Kaplan turbine

Explanation : As the head for Kaplan turbine is low, the discharge of water through the turbine is high and hence, blade resistance should be low. That’s why Kaplan turbine will have the lowest number of blades.

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