Chemical Engineering MCQs

Page No. 244

Power required by a centrifugal pump is proportional to (where, D = diameter, N = r.p.m) ________________?


aN2D3

✖


bND2

✖


cN2D

✖


dN3D5

✓


View Answer N3D5

Drag is defined as the force exerted by the___________________?


aFluid on the solid in a direction opposite to flow

✖


bFluid on the solid in the direction of flow

✓


cSolid on the fluid

✖


dNone of these

✖



One poise (unit of absolute/dynamic viscosity) is equivalent to one_____________________?


agm/cm2. sec

✖


bgm/cm. sec

✓


ccm2/sec

✖


dm2/sec

✖


View Answer gm/cm. sec

With increase in molecular weight of the gas, the head developed by a centrifugal compressor will________________?


aDecrease

✓


bIncrease

✖


cRemain same

✖


dUnpredictable

✖


View Answer Decrease

In case of a pipe exit fitted with a nozzle, the____________________?


aConversion of kinetic head to pressure head is facilitated

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bConversion of pressure head to kinetic head is facilitated

✖


cPower transmitted through the nozzle is maximum, when the head lost due to friction in the pipe is equal to one third of the total supply head

✖


dBoth B. and C.

✓


View Answer Both B. and C.

Which of the following can be used to create a flow of gas, where no significant compression is required ?


aReciprocating compressor

✖


bBlower

✓


cAxial flow compressor

✖


dCentrifugal compressor

✖


View Answer Blower

The ratio of inertial forces to viscous forces is called the ______________ number?


aWeber

✖


bMach

✖


cFroude

✖


dReynold

✓


View Answer Reynold

In laminar flow through a round tube, the discharge varies ______________________?


aLinearly as the viscosity

✖


bInversely as the pressure drop

✖


cInversely as the viscosity

✓


dAs the square of the radius

✖



Fanning friction factor for laminar flow of fluid in a circular pipe is____________________?


aNot a function of the roughness of pipe wall

✖


bInversely proportional to Reynolds number

✖


cBoth A. & B.

✓


dNeither A. nor B.

✖


View Answer Both A. & B.

A hydraulic accumulator comprises of__________________?


aA storage device and a control valve

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bA cylinder and a plunger

✓


cTwo pistons and two cylinders

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dA storage tank and a ram pump

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