Chemical Engineering MCQs

Page No. 218

With increase in the shear rate, the apparent viscosity of pseudo-plastic fluids__________________?


aIncreases


bDecreases


cRemain same


dMay increase or decrease; depends on the magnitude of shear rate


View Answer Decreases

If the discharge of a centrifugal pump is throttled, then its suction lift_______________________?


aIncreases


bDecreases


cRemains unchanged


dData insufficient to predict


View Answer Increases

Kinetic energy of fluid per unit weight represented by the velocity head is given by___________________?


a2v2/gc


bv2/2gc


cρv2/gc


dρ.v2/2gc


View Answer v2/2gc

Water hammer in a pipeline results from the____________________?


aBursting of pipelines due to closure by a valve


bRapid pressure change due to a rapid change in the rate of flow


cPressure increase due to closure of a valve resulting in decrease in rate of flow


dNone of these



Mass velocity is independent of temperature & pressure, when the flow is______________________?


aUnsteady through unchanged cross-section


bSteady through changing cross-section


cSteady and the cross-section is unchanged


dUnsteady and the cross-section is changed



Permanent loss in a Venturimeter is about ___________ percent of the pressure drop in the upstream cone?


a1


b10


c40


d70


View Answer 10

The uniformity of a gas fluidised bed depends upon the _______________ of the solid particles?


aSize


bSurface properties


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

Most of the centrifugal pumps used in chemical plants are usually ____________________ driven?


aSteam


bDiesel engine


cElectric motor


dGas turbine


View Answer Electric motor

Remote control valve is a _______________ valve?


aGate


bButterfly


cNeedle


dGlobe


View Answer Butterfly

With increase in temperature, the vapor pressure of liquids__________________?


aIncreases


bIncreases linearly


cDecreases


dRemain constant


View Answer Increases

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