Chemical Engineering MCQs

Page No. 226

Froude number is the ratio of__________________?


aShear stress to gravitational stress

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bDrag stress to shear stress

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cInertial stress to shear stress

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dInertial stress to gravitational stress

✓



Which of the following is used for pumping crude oil from oil well ?


aSingle stage centrifugal pump

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bGear pump

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cScrew pump

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dDuplex/triplex reciprocating pump

✓



The buoyant force acting on a floating body is dependent on the _______________?


aViscosity of the liquid

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bWeight of the liquid displaced

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cDepth of immersion of the body

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dSurface tension of the liquid

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Horsepower requirement for given pump capacity depends upon the_______________?


aSpecific gravity of the liquid

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bSuction lift

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cDischarge head

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dAll A., B. and C.

✓


View Answer All A., B. and C.

For a given Reynolds number, in a hydraulically smooth pipe, further smoothening ____________ the friction factor?


aBrings about no further reduction of

✓


bIncreases

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cDecreases

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dNone of these

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The unit of velocity head is_________________?


aft-lb/sec

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bft-lb/ft3

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cft-lbf/lb

✓


dft-lbf/sec

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View Answer ft-lbf/lb

The capacity of a centrifugal pump Can be increased by increasing the_________________?


aImpeller diameter or speed

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bNumber of pumps and joining them in series

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cNumber of pumps and joining them in parallel

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dAll A., B. and C.

✓


View Answer All A., B. and C.

Curve III in the bellow diagram represents a/an________________?


aDilatent fluid

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bPseudo plastic fluid

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cIdeal plastic

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dNone of these

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View Answer Pseudo plastic fluid

The main factor on which the behaviour of a mass of fluidised solid depends mainly is the___________________?


aFluid characteristics

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bParticle size

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cBoth A. and B.

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dNeither A. nor B.

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View Answer Both A. and B.

Umf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 Umf to 2.5 Umf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the_______________?


aDrag on particles

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bDrag on column walls

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cBed height

✓


dBed voidage

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View Answer Bed height

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