Chemical Engineering MCQs

Page No. 221

The head developed by a centrifugal pump is largely determined by the____________________?


aPower of the pump


bNature of the liquid being pumped


cAngle of the vanes and the speed of the tip of the impeller


dVapour pressure of the liquid



Applying a pressure drop across a capillary results in a volumetric flow rate ‘Q’ under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is____________________?


aQ/2


bQ/4


cQ/8


dQ/16


View Answer Q/16

A stream tube is that, which has ______________________ cross-section entirely bounded by stream lines?


aA circular


bAny convenient


cA small


dA large


View Answer Any convenient

A fluid element has a velocity V = -y2. xi + 2yx2 . j. The motion at (x, y) = (1/√2, 1) is_________________?


aRotational and incompressible


bRotational and compressible


cIrrotational and compressible


dIrrotational and incompressible



Centrifugal compressors compared to reciprocating compressors__________________?


aRequire less space


bHave quieter operation


cHave lower operating costs


dAll A., B. and C.


View Answer All A., B. and C.

The ratio of inertial forces to elastic forces is called the __________ number?


aReynolds


bMach


cEuler


dWeber


View Answer Mach

The fluid property, due to which, mercury does not wet the glass is__________________?


aSurface tension


bViscosity


cCohesion


dAdhesion


View Answer Surface tension

The head loss in turbulent flow in a pipe varies________________?


aAs velocity


bAs (velocity)2


cInversely as the square of diameter


dInversely as the velocity


View Answer As (velocity)2

Co-efficient of discharge (Cd) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about__________________?


a0.42


b0.62


c0.82


d0.98


View Answer 0.62

The excess of the sum of pressure & velocity heads over the vapor pressure of the liquid at the suction is called the___________________?


aStatic submergence


bNet positive suction head (NPSH)


cCavitation sensitivity


dPriming



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