Chemical Engineering MCQs

Page No. 171

The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the_____________________?


aBarometric pressure

✓


bSpeed of the impeller

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cDiameter of the impeller

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dBoth B. and C.

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View Answer Barometric pressure

For flow through a venturi at a particular discharge, the correct relationships among velocities at point X, Y and Z would be __________________?


aV1 < V2 < V3

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bV2 > V1 and V2 > V3

✓


cV1 > V2 > V3

✖


dNone of these

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View Answer V2 > V1 and V2 > V3

A fluid (μ/ρ) = 0.01 cm2/sec is moving at critical flow condition (NRe = 2100) through a pipe of dia 3 cms. Velocity of flow is _______________ cm/sec?


a7

✓


b700

✖


c7000

✖


d630

✖


View Answer 7

Reciprocating pumps compared to centrifugal pumps__________________?


aDeliver liquid at uniform pressure

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bCan handle slurries more efficiently

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cAre not subject to air binding

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dCan be operated with delivery valve closed

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What is the value of co-efficient of discharge for square edged circular orifice (for β = 0.3 to 0.5) ?


a0.61 – 0.63

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b0.5 – 0.75

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c0.75 – 0.90

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d0.35 – 0.55

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View Answer 0.61 – 0.63

Bernoulli’s equation describes the _______________?


aMechanical energy balance in potential flow

✓


bKinetic energy balance in laminar flow

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cMechanical energy balance in turbulent flow

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dMechanical energy balance in boundary layer

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Major loss in sudden contraction in pipe flow is due to ________________?


aBoundary friction

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bFlow contraction

✓


cExpansion of flow after sudden contraction

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dNone of these

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View Answer Flow contraction

In case of laminar flow of fluid through a circular pipe, the__________________?


aShear stress over the cross-section is proportional to the distance from the surface of the pipe

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bSurface of velocity distribution is a paraboloid of revolution, whose volume equals half the volume of circumscribing cylinder

✓


cVelocity profile varies hyperbolically and the shear stress remains constant over the crosssection

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dAverage flow occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius)

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Baffles in mixing tanks are provided to__________________?


aReduce swirling and vortex formation

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bIncrease the structural strength of the tank

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cAid in rotational flow

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dNone of these

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Flow measurement in an open channel is done by a/an ________________?


aVenturimeter

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bOrificemeter

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cWeir

✓


dRotameter

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View Answer Weir

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