Hydraulic Machines - Mechanical Engineering Questions and Answers

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The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by

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Which of the following statement is correct ?

The centrifugal pump is suitable for large discharge and smaller heads.

The centrifugal pump requires less floor area and simple foundation as compared to reciprocating pump.

The efficiency of centrifugal pump is less as compared to reciprocating pump.

all of the above

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For 450 m head of water, __________ shallbeused.

Pelton wheel

Kaplan turbine

Francis turbine

none of these

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The action of a centrifugal pump is that of a reversed reaction turbine.

Correct

Incorrect

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The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is

slow speed with radial flow at outlet

medium speed with radial flow at outlet

high speed with radial flow at outlet

high speed with mixed flow at outlet

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The speed ratio in case of Francis turbine varies from

0.15 to 0.3

0.4 to 0.5

0.6 to 0.9

1 to 1.5

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A Kaplan turbine is preferred for a specific speed of 300 to 1000 r.p.m.

Yes