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


bV1 = V2 = V3


cQ1 = Q2 = Q3


df = f1 + f2 + f3


View Answer Q = Q1 + Q2 + Q3

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


aNeedle


bGlobe


cGate


dButterfly


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


b0


c1/2


dNone of these


View Answer 2

Capacity of a rotary gear pump can be varied by__________________?


aChanging the speed of rotation


bBleeding air into suction


cBypassing liquid from the suction or discharge line


dAll A., B. and C.


View Answer All A., B. and C.

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


aGenerally a needle valve


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


cHelpful in easy removal of samples


dAll A., B. and C.


View Answer All A., B. and C.

Paper pulp is an example of _____________ fluid?


aDilatant


bBingham plastic


cNewtonian


dPseudo-plastic


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


bThe component being parallel to the flow direction


cThe component being normal to the flow direction


dNone of these



The most serious disadvantage of an orificemeter is that________________?


aIt is not very accurate


bIt is very costly


cMost of the pressure drop is not recoverable


dIt is not suitable for measuring gas flow



Boundary layer exists in flow_________________?


aOf real fluids


bOver flat surfaces only


cIn pipes only


dOf ideal fluids only


View Answer Of real fluids

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


a0.5


b1


c2


d5


View Answer 0.5

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