HYDRAULICS AND FLUID MECHANICS IN ME QUIZ

Piezometer is used to measure

Pressure in pipe, channels etc

Very low pressures

Atmospheric pressure

Difference of pressure between two points

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The loss of head at entrance in a pipe is (where v = Velocity of liquid in the pipe)

v²/2g

0.375v²/2g

0.75v²/2g

0.5v²/2g

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Air vessels in reciprocating pump are used to

Smoothen flow

Reduce acceleration to minimum

Increase pump efficiency

Save pump from cavitations

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A flow is called sub-sonic, if the Mach number is

Less than unity

Unity

Between 1 and 6

More than 6

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The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)

H × √(2g)

2g × √H

2gH

√(2gh)

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A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is

0.6

0.83

0.3

0.4

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Stoke is the unit of

Kinematic viscosity in C. G. S. units

Dynamic viscosity in M. K. S. units

Kinematic viscosity in M. K. S. units

Dynamic viscosity in S. I. units

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The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)

(2 L.A.N)/60

2 L.A.N

L.A.N

(L.A.N)/60

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The equation of continuity holds good when the flow

is steady

velocity is uniform at all the cross sec-tions

is one dimensional

All of these

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In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.

Less than

None of these

Equal to

More than

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