HYDRAULICS AND FLUID MECHANICS IN ME QUIZ

The vapour pressure over the concave surface is

less man the vapour pressure over the plane surface

greater than the vapour pressure over the plane surface

equal to the vapour pressure over the plane surface

zero

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The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) is

ηo = ηh × ηm

ηh = ηo × ηm

ηm = ηm × ηh

None of these

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The weight per unit volume of a liquid at a standard temperature and pressure is called

None of these

Mass density

Specific gravity

Specific weight

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For centrifugal pump impeller, the maximum value of the vane exit angle is

25° to 30°

15° to 20°

20° to 25°

10° to 15°

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The discharge through a convergent mouthpiece is __________ the discharge through an internal mouthpiece of the same diameter and head of water.

Double

Equal to

One-half

Three fourth

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The hammer blow in pipes occurs when

The flow of fluid through the pipe is suddenly brought to rest by closing of the valve

The flow of fluid through the pipe is gradually brought to rest by closing of the valve

There is excessive leakage in the pipe

The pipe bursts under high pressure of fluid

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The shear stress-strain graph for a Newtonian fluid is a

Straight line

Elliptical

Parabolic curve

Hyperbolic curve

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Medium specific speed of turbine implies it is

Impulse turbine

Francis turbine

Any one of the above

Propeller turbine

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The overall efficiency for a Pelton wheel lies between

0.65 to 0.75

0.75 to 0.85

0.50 to 0.65

0.85 to 0.90

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For small discharge at high pressure, following pump is preferred

Mixed flow

Centrifugal

Reciprocating

Axial flow

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