Chemical Engineering MCQs

Page No. 228

Momentum correction factor used in fluid flow problems accounts for the__________________?


aChange in direction of flow


bChange in total energy


cChange in pressure


dNon uniform direction of velocities at inlet & outlet sections



A compressor that takes suction at a pressure below atmospheric and discharge against atmospheric pressure is called a ____________ pump?


aSump


bVolute


cVacuum


dSubmerged


View Answer Vacuum

A mixed flow centrifugal pump_______________________?


aEmploys such an impeller, through which the flow is a combination of radial & axial flow


bMixes the two fluids before pumping them


cPumps the two fluids separately and then mixes them


dEmploys impellers in both the radial & axial directions



Which of the following has the maximum compression ratio ?


aBlower


bCompressor


cVacuum pump


dFan


View Answer Vacuum pump

For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively) ?


aG is above B


bB is above G


cB & G coincide


dNone of these


View Answer B is above G

Volute of a centrifugal pump should be designed in a fashion, such that the________________?


aKinetic head gets converted into static head


bMoving stream gradually reduces velocity


cMean velocity remains constant


dNone of these



In a stabilised soap bubble, pressure inside it compared to external pressure is________________?


aMore


bLess


cSame


dUnpredictable


View Answer More

The contraction co-efficient for Borda’s mouthpiece (for frictionless fluid) is__________________?


a0.1


b0.5


c0.94


d1


View Answer 0.5

The value of critical Reynolds number for pipe flow is_________________?


a1,300


b10,000


c100,000


dNone of these


View Answer 1,300

The range of a particular Rotameter can be increased by__________________?


aUse of floats of different densities


bNo means


cIncreasing the diameter of the float


dDecreasing the diameter of the float



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