Chemical Engineering MCQs

Page No. 226

Froude number is the ratio of__________________?


aShear stress to gravitational stress


bDrag stress to shear stress


cInertial stress to shear stress


dInertial stress to gravitational stress



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


aSingle stage centrifugal pump


bGear pump


cScrew pump


dDuplex/triplex reciprocating pump



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


aViscosity of the liquid


bWeight of the liquid displaced


cDepth of immersion of the body


dSurface tension of the liquid



Horsepower requirement for given pump capacity depends upon the_______________?


aSpecific gravity of the liquid


bSuction lift


cDischarge head


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


cDecreases


dNone of these



The unit of velocity head is_________________?


aft-lb/sec


bft-lb/ft3


cft-lbf/lb


dft-lbf/sec


View Answer ft-lbf/lb

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


aImpeller diameter or speed


bNumber of pumps and joining them in series


cNumber of pumps and joining them in parallel


dAll A., B. and C.


View Answer All A., B. and C.

Curve III in the bellow diagram represents a/an________________?


aDilatent fluid


bPseudo plastic fluid


cIdeal plastic


dNone of these


View Answer Pseudo plastic fluid

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


aFluid characteristics


bParticle size


cBoth A. and B.


dNeither A. nor B.


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


bDrag on column walls


cBed height


dBed voidage


View Answer Bed height

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