Chemical Engineering MCQs

Page No. 221

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


aPower of the pump

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bNature of the liquid being pumped

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

✓


dVapour pressure of the liquid

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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

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bQ/4

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cQ/8

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dQ/16

✓


View Answer Q/16

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


aA circular

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bAny convenient

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cA small

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dA large

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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

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bRotational and compressible

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cIrrotational and compressible

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dIrrotational and incompressible

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Centrifugal compressors compared to reciprocating compressors__________________?


aRequire less space

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bHave quieter operation

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cHave lower operating costs

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dAll A., B. and C.

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View Answer All A., B. and C.

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


aReynolds

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bMach

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cEuler

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dWeber

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View Answer Mach

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


aSurface tension

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bViscosity

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cCohesion

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dAdhesion

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View Answer Surface tension

The head loss in turbulent flow in a pipe varies________________?


aAs velocity

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bAs (velocity)2

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cInversely as the square of diameter

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dInversely as the velocity

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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

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b0.62

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c0.82

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d0.98

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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

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bNet positive suction head (NPSH)

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cCavitation sensitivity

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dPriming

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