Chemical Engineering MCQs

Page No. 218

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


aIncreases

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bDecreases

✓


cRemain same

✖


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

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View Answer Decreases

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


aIncreases

✓


bDecreases

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cRemains unchanged

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dData insufficient to predict

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View Answer Increases

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


a2v2/gc

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bv2/2gc

✓


cρv2/gc

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dρ.v2/2gc

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View Answer v2/2gc

Water hammer in a pipeline results from the____________________?


aBursting of pipelines due to closure by a valve

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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

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dNone of these

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


aUnsteady through unchanged cross-section

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bSteady through changing cross-section

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cSteady and the cross-section is unchanged

✓


dUnsteady and the cross-section is changed

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


a1

✖


b10

✓


c40

✖


d70

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View Answer 10

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


aSize

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bSurface properties

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cBoth A. and B.

✓


dNeither A. nor B.

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View Answer Both A. and B.

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


aSteam

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bDiesel engine

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cElectric motor

✓


dGas turbine

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View Answer Electric motor

Remote control valve is a _______________ valve?


aGate

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bButterfly

✓


cNeedle

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dGlobe

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View Answer Butterfly

With increase in temperature, the vapor pressure of liquids__________________?


aIncreases

✓


bIncreases linearly

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cDecreases

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dRemain constant

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View Answer Increases

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