Hydraulics and Fluid Mechanics - Mechanical Engineering Questions and Answers

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An impulse turbine is used for

Low head of water

High head of water

Medium head of water

High discharge

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The power developed by a turbine is (where H = Head of water under which the turbine is working)

Directly proportional to H^1/2

Inversely proportional to H^1/2

Directly proportional to H^3/2

Inversely proportional to H^3/2

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The flow 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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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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According to fan laws, at constant speed and capacity, the pressure and power vary

Directly as the air or gas density

Inversely as square root of density

Inversely as density

As square of density

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The height of a water column equivalent to a pressure of 0.15 MPa is

15.3 m

25.3 m

35.3 m

45.3 m

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In an immersed body, centre of pressure is

At the centre of gravity

Above the centre of gravity

Below be centre of gravity

Could be above or below e.g. depending on density of body and liquid

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The undershot water wheels are those in which

The wheel runs entirely by the weight of water

The wheel runs entirely by the impulse of water

The wheel runs partly by the weight of water and partly by the impulse of water

None of the above

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Multistage centrifugal pumps are used to obtain

High discharge

High head

Pumping of viscous fluids

High head and high discharge