Fluid Mechanics - Chemical Engineering Questions and Answers

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With a constant diameter impeller of a centrifugal pump

Its capacity varies directly as the square of speed

Head varies as the square of speed

Horsepower input varies as the square of speed

Head varies as the speed

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In a fluidised bed reactor

Temperature gradients are very high

Temperature is more or less uniform

Hot spots are formed

Segregation of the solids occurs

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In a free vortex, the

Velocity changes linearly with radial distance

Flow is necessarily rotational

Radial component of velocity is same everywhere

Stream lines are not circular

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The friction factor for turbulent flow in a hydraulically smooth pipe

Depends only on Reynolds number

Does not depend on Reynolds number

Depends on the roughness

None of these

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Water hammer in a pipeline results from the

Bursting of pipelines due to closure by a valve

Rapid pressure change due to a rapid change in the rate of flow

Pressure increase due to closure of a valve resulting in decrease in rate of flow

None of these

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Air vessel provided in a reciprocating pump is for

Increasing the acceleration head

Making the friction in pipe uniform

Decreasing the acceleration head

None of these

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Speed of sound in an ideal gas depends on its

Temperature

Pressure

Specific volume

None of these

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Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump?

Increasing the impeller speed and the volute area

Increasing the number of vanes in the impeller

Mounting of two or more impellers in series on a single shaft

Either of A, B or C

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In continuous fluidisation

Solids are completely entrained

The pressure drop is less than that for batch fluidisation

There is no entrainment of solids

Velocity of the fluid is very small