HYDRAULICS AND FLUID MECHANICS IN ME QUIZ

In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by

Designing new impeller

Not possible

Trimming the impeller size to the required size by machining

Some other alterations in the impeller

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In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than

surface friction

frictional force

All of these

viscosity

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Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called

viscosity

compressibility

cohesion

adhesion

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Liquids

Are not affected by change in pressure and temperature

Occupy definite volume

Cannot be compressed

None of the listed here

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Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m3, Q = Discharge of the pump in m3/s, and ηo = Overall efficiency of the pump)

(w Hm Q) / ηo

(w Q ηo) / Hm

(w Hm) / (Q × ηo)

(w Q) / (Hm × ηo)

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The speed of sound in a ideal gas varies directly as its

modulus of elasticity

temperature

absolute temperature

density

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The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is _______ of the jet velocity,

Three-fourth

One-half

Double

One-fourth

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The vapour pressure over the concave surface is

zero

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

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High specific speed of a pump implies it is

Axial flow pump

Centrifugal pump

Any one of the above

Mixed flow pump

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Coefficient of velocity of venturimeter

is independent of Reynolds number

is equal to the coefficient of discharge of venturimeter

decreases with higher Reynolds number

None of these

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