Chemical Engineering MCQs

Page No. 217

Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the_______________?


aBack flow of fluid in the event of stoppage of pump


bDischarge pressure


cFlow of liquid during operation of the pump


dAll A., B. and C.



Head developed by a centrifugal pump depends on its___________________?


aSpeed


bImpeller diameter


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

Pump used for the transportation of molten sodium in a fast breader reactor is a/an __________ pump?


aReciprocating


bPlunger


cElectromagnetic


dGear


View Answer Electromagnetic

Which is the correct relationship for a centrifugal pump? (Where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm) ?


aD = 1840 H0.5/N


bD = 1840 N/H0.5


cH = 1840 D0.5/N


dD = 1840 H/N


View Answer D = 1840 H0.5/N

The terminal velocity of a particle moving through a fluid varies as dp n. The value of n is equal to _______________ in Stoke’s law regime?


a1


b0.5


c2


d1.5


View Answer 2

Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be _____________________ ft?


a40


b34


c8


d37


View Answer 8

For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is___________________?


aMore


bLess


cEqual


dEither A. or B.; depends on the viscosity of the fluid


View Answer More

The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10-6m2/s) ?


a24000


b24


c0.24


d0.44


View Answer 0.44

A piezometer opening measures the _____________ fluid pressure?


aStatic


bUndisturbed


cTotal


dDynamic


View Answer Undisturbed

A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke’s law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity ?


aSame as that of A


bOne fourth as that of A


cTwice as that of A


dFour times as that of A



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