Fluid Mechanics - Chemical Engineering Questions and Answers

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In case of venturimeters, friction losses are about __________ percent of maximum velocity head.

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Erosion and pits formation on the impeller of a centrifugal pump may be due to

Cavitation

Low speed of impeller

Its operation with delivery valve closed for considerable time after starting the pump

Off centering of pump with motor

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Check in a centrifugal pump is

Provided in the discharge line

Generally a globe valve

Provided to prevent liquid from backing up through the pump when the pump is turned off or accidently stops running

All of the above

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Check valves are used

At high pressure

In bends

For controlling water flow

For unidirectional flow

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Nominal Pipe Size (NPS) of a pipe less than 12 inches in diameter indicates its

Inner diameter

Outer diameter

Thickness

Neither inner nor outer diameter

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Experimental study of laminar fluid flow through a circular tube was conducted by

Reynolds

Hagen and Poiseuille

Pascal

Blake-Plummer

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Centrifugal pump is normally classified on the basis of the

Rpm

Type of casing

Impeller blade angle

Number of blades in impeller

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The ratio of the wall drag to the form drag in the Stoke's law range (for motion of spherical particles in a stationary fluid) is

0.5

0.33

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Cocks are used to control

Water

Any liquid

Solids

None of these