Chemical Engineering MCQs

Page No. 233

Laminar flow is characterised by the nonexistence of_________________?


aPressure fluctuation

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bEddies

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cDeviating velocities

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dAll A., B. & C.

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View Answer All A., B. & C.

The maximum depth from which a centrifugal pump can draw water is________________?


aDependent on the speed of the pump

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bDependent on the power of the pump

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c34 feet

✓


d150 feet

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View Answer 34 feet

The pressure and power requirement of a gas fan at constant speed & capacity varies ____________ the gas density?


aDirectly as

✓


bInversely as square root of

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cInversely as

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dAs square of

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View Answer Directly as

A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump_________________?


aDevelops a lower head

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bCapacity is reduced

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cRequires more power

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dAll A., B. and C.

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View Answer All A., B. and C.

A 2″ gate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was Δp. For the same discharge, the pressure drop across globe valve is__________________?


aΔp

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b< Δp

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c> Δp

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dΔp2

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View Answer > Δp

The co-efficient of discharge of an orificemeter is a function of ________________?


aReynolds number at the orifice

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bRatio of orifice dia to pipe dia

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cBoth A. and B.

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dNone of the above parameters, and has a constant value of 0.61

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View Answer Both A. and B.

A streamline is a line in flow field _________________?


aThat is traced by all the fluid particles passing through a given point

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bAlong which a fluid particle travels

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cSuch that at every point on it, the velocity is tangential to it

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dNone of these

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Bernoulli’s equation for steady, frictionless, continuous flow states that the ______________ at all sections is same?


aTotal pressure

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bTotal energy

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cVelocity head

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dNone of these

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View Answer Total energy

In turbulent flow, the__________________?


aFluid particles move in an orderly manner

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bMomentum transfer is on molecular scale only

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cShear stress is caused more effectively by cohesion than momentum transfer

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dShear stresses are generally larger than in a similar laminar flow

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Check valve is used for ________________ flow?


aVery precise control of

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bUnidirectional

✓


cMultidirectional

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dNone of these

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View Answer Unidirectional

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