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


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


bA cylinder and a plunger


cTwo pistons and two cylinders


dA storage tank and a ram pump



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