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ME Set-1
Hydraulic Machines
5

Hydraulic Machines MCQ with Answers

5) Braking jet in an impulse turbine is used

To break the jet of water

To bring the runner to rest in a short time

To change the direction of runner

None of these

Answer is:

To bring the runner to rest in a short time

Hydraulic Machines MCQ with Answers

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Related Hydraulic Machines MCQ with Answers

6) A Pelton wheel is

Tangential flow impulse turbine

Inward flow impulse turbine

Outward flow impulse turbine

Inward flow reaction turbine

Answer is:

Tangential flow impulse turbine

Explanation:

In an impulse turbine, the total energy at the inlet of a turbine is only kinetic energy. The pressure of water both at entering and leaving the vanes is atmospheric. It is used for high head of water. A Pelton wheel is a tangential flow impulse turbine.

A Pelton wheel is

7) An impulse turbine is used for

Low head of water

High head of water

Medium head of water

High discharge

Answer is:

High head of water

8) The gross or total head of the turbine is the ______ of the water levels at the head race and tail race.

Sum

Difference

Product

None of the above

Answer is:

Difference

9) The hydraulic efficiency of an impulse turbine is the

Ratio of the actual power produced by the turbine to the energy actually supplied by the turbine

Ratio of the actual work available at the turbine to the energy imparted to the wheel

Ratio of the work done on the wheel to the energy of the jet

None of the above

Answer is:

Ratio of the work done on the wheel to the energy of the jet

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