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

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bDischarge pressure

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cFlow of liquid during operation of the pump

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dAll A., B. and C.

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Head developed by a centrifugal pump depends on its___________________?


aSpeed

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bImpeller diameter

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cBoth A. and B.

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dNeither A. nor B.

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View Answer Both A. and B.

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


aReciprocating

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bPlunger

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cElectromagnetic

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dGear

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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

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bD = 1840 N/H0.5

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cH = 1840 D0.5/N

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dD = 1840 H/N

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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

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b0.5

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c2

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d1.5

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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

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b34

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c8

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d37

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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

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bLess

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cEqual

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

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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

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b24

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c0.24

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d0.44

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View Answer 0.44

A piezometer opening measures the _____________ fluid pressure?


aStatic

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bUndisturbed

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cTotal

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dDynamic

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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

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bOne fourth as that of A

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cTwice as that of A

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dFour times as that of A

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