30) The flow ratio of Francis turbine is defined as the ratio of the

velocity of flow at inlet to the theoretical jet velocity

theoretical velocity of jet to the velocity of flow at inlet

velocity of runner at inlet to the velocity of flow at inlet

none of the above

Answer is:

velocity of flow at inlet to the theoretical jet velocity

Hydraulic Machines MCQ with Answers

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31) The runaway speed of a hydraulic turbine is the speed

at full load

at which there will be no damage to the runner

corresponding to maximum overload permissible

at which the turbine will run freely without load

Answer is:

at which the turbine will run freely without load

32) The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as

normal speed

unit speed

specific speed

none of these

Answer is:

specific speed

33) The efficiency of a Pelton wheel working under constant head ______ with the increase in power.

remains same

increases

decreases

none of the above

Answer is:

increases

34) The discharge through a reaction turbine ____ with the increase in unit speed

remains same

increases

decreases

none of the above

Answer is:

decreases

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30) The flow ratio of Francis turbine is defined as the ratio of the

velocity of flow at inlet to the theoretical jet velocity

Hydraulic Machines MCQ with Answers

Related Hydraulic Machines MCQ with Answers

31) The runaway speed of a hydraulic turbine is the speed

at which the turbine will run freely without load

32) The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as

specific speed

33) The efficiency of a Pelton wheel working under constant head ______ with the increase in power.

increases

34) The discharge through a reaction turbine ____ with the increase in unit speed

decreases

Hydraulic Machines MCQ with Answers