Chemical Engineering MCQs

Page No. 229

Propellers are____________________?


aAxial flow mixers

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bLow speed impeller

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cUsed for mixing liquids of high viscosity

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dRadial flow mixers

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View Answer Axial flow mixers

Cavitation occurs in a centrifugal pump when the suction pressure is________________?


aLess than the vapour pressure of the liquid at that temperature

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bGreater than the vapour pressure of the liquid at that temperature

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cEqual to the vapour pressure

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dEqual to the developed head

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Erosion and pits formation on the impeller of a centrifugal pump may be due to________________?


aCavitation

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bLow speed of impeller

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cIts operation with delivery valve closed for considerable time after starting the pump

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dOff centering of pump with motor

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View Answer Cavitation

What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe) ?


a0.5

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b1

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c1.5

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d2

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View Answer 2

The curve of metacentre for a floating body ____________ the curve of buoyancy?


aIs always below

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bIs the evolute of

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cIntersects at right angle

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dIs tangential to

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View Answer Is the evolute of

Slugging occurs in a fluidised bed, if the bed is___________________?


aNarrow

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bDeep

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cBoth A. & B.

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dNeither A. nor B.

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View Answer Both A. & B.

Unsteady non-uniform flow is represented by flow through a/an_________________?


aLong pipe at constant rate

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bLong pipe at decreasing rate

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cExpanding tube at increasing rate

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dExpanding tube at constant rate

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In case of turbulent flow of a Newtonian fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity)?


aVavg

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b1.2 Vavg

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c1.5 Vavg

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d1.8 Vavg

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View Answer 1.2 Vavg

Which law is followed by the velocity distribution in the turbulent boundary layer ?


aParabolic law

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bLinear law

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cLogarithmic law

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dNone of these

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View Answer Logarithmic law

f = 16/NRe, is valid for__________________?


aTurbulent flow

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bLaminar flow through an open channel

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cSteady flow

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dNone of these

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View Answer None of these

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