Chemical Engineering MCQs

Page No. 233

Laminar flow is characterised by the nonexistence of_________________?


aPressure fluctuation


bEddies


cDeviating velocities


dAll A., B. & C.


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


bDependent on the power of the pump


c34 feet


d150 feet


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


cInversely as


dAs square of


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


bCapacity is reduced


cRequires more power


dAll A., B. and C.


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


b< Δp


c> Δp


dΔp2


View Answer > Δp

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


aReynolds number at the orifice


bRatio of orifice dia to pipe dia


cBoth A. and B.


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


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


bAlong which a fluid particle travels


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


dNone of these



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


aTotal pressure


bTotal energy


cVelocity head


dNone of these


View Answer Total energy

In turbulent flow, the__________________?


aFluid particles move in an orderly manner


bMomentum transfer is on molecular scale only


cShear stress is caused more effectively by cohesion than momentum transfer


dShear stresses are generally larger than in a similar laminar flow



Check valve is used for ________________ flow?


aVery precise control of


bUnidirectional


cMultidirectional


dNone of these


View Answer Unidirectional

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