Chemical Engineering MCQs

Page No. 220

The hydrodynamic and thermal boundary layers will merge, when ____________________?


aPrandtl number is one

✓


bSchmidt number tends to infinity

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cNusselt number tends to infinity

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dArchimedes number is greater than 10000

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View Answer Prandtl number is one

The velocity profile exhibited by laminar flow of Newtonian fluids is such that the velocity distribution w.r.t. radius of the circular pipe is a/an ______________ with the apex at the centre line of the pipe?


aHyperbola

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bParabola

✓


cSemi-circle

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dSemi-ellipse

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View Answer Parabola

A centrifugal pump is called a turbine pump, if it is having a_________________?


aTurbine type impeller

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bVaned diffusion casing

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cRotating vaned volute

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dNone of these

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In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure ______________ the vapor pressure of the liquid at the suction temperature?


aLower than

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bHigher than

✓


cEqual to

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dNone of these

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View Answer Equal to

A mercury (specific gravity = 13.6) manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 1.6), then for the same flow rate of water the new manometer reading will be _______________ cms?


a17

✓


b42

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c84

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d1.8

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View Answer 17

Power required for mixing Newtonian fluids is a function of the _________________?


aSpeed of impeller, diameter of impeller & viscosity

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bDensity & viscosity of fluid only

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cDensity of fluid, viscosity of fluid & impeller dia only

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dNone of these

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View Answer None of these

Which of the following properties of a fluid is responsible for offering resistance to shear ?


aSurface tension

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bViscosity

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cSpecific gravity

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dAll A., B., and C.

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View Answer Viscosity

Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of ______________ flow type?


aAxial

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bRadial

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cMixed

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dNone of these

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View Answer Axial

The Mach number for hypersonic flow of compressible fluid is____________________?


a1

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b> 1

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c> 4

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d< 2

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View Answer > 4

Priming is needed in a ______________ pump?


aReciprocating

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bGear

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cCentrifugal

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dDiaphragm

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View Answer Centrifugal

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