Chemical Engineering MCQs

Page No. 232

If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor). ?


aQ = Q1 + Q2 + Q3

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bV1 = V2 = V3

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cQ1 = Q2 = Q3

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df = f1 + f2 + f3

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View Answer Q = Q1 + Q2 + Q3

The valve used for very remote and accurate control of fluid is a _____________ valve?


aNeedle

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bGlobe

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cGate

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dButterfly

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View Answer Needle

For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of_________________?


a2

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b0

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c1/2

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dNone of these

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View Answer 2

Capacity of a rotary gear pump can be varied by__________________?


aChanging the speed of rotation

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bBleeding air into suction

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cBypassing liquid from the suction or discharge line

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dAll A., B. and C.

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View Answer All A., B. and C.

The vent valve provided in a liquid handling centrifugal pump is___________________?


aGenerally a needle valve

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bUsed to release any gases that might be vapour locking the pump

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cHelpful in easy removal of samples

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dAll A., B. and C.

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View Answer All A., B. and C.

Paper pulp is an example of _____________ fluid?


aDilatant

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bBingham plastic

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cNewtonian

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dPseudo-plastic

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View Answer Bingham plastic

Drag is the force component exerted on an immersed object, ?


aPassing the centroid of the body at 60°to the direction of motion

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bThe component being parallel to the flow direction

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cThe component being normal to the flow direction

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dNone of these

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The most serious disadvantage of an orificemeter is that________________?


aIt is not very accurate

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bIt is very costly

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cMost of the pressure drop is not recoverable

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dIt is not suitable for measuring gas flow

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Boundary layer exists in flow_________________?


aOf real fluids

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bOver flat surfaces only

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cIn pipes only

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dOf ideal fluids only

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View Answer Of real fluids

The capillary rise of mercury is maximum in glass tube of dia _____________ mm?


a0.5

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b1

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c2

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d5

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View Answer 0.5

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