In case of a Medium runner, tan (Î±1) CANNOT be given by (Î±1 = Guide vane angle at inlet)?

Mechanical Engineering : Hydraulic Machines - Quiz(MCQ)

Vw1 / u1

Vr1 / u1

Vr1 / Vw1

Vf1 / Vw1

Correct Answer : Option (A) : Vw1 / u1

Explanation : In medium runner, Vf1 = Vr1 & Vw1 = u1. Vw1 and u1 are along the same direction, hence that cannot be written as tan (α1).

Recently Updated in Hydraulic Machines Questions

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.

Mechanical Engineering MCQ's

Theory of Machines

Engineering Mechanics

Machine Design

Strength of Materials

Engineering Materials

Automobile Engineering

Steam Boilers and Engines