Chemical Engineering MCQs

Page No. 212

Power loss in an orificemeter is _____________ that in a Venturimeter?


aLess than


bSame as


cMore than


dData insufficient, cannot be predicted


View Answer More than

Which of the following has the minimum compressibility ?


aWater at room temperature


bAir at room temperature


cOxygen at room temperature


dNitrogen at room temperature



Nominal size of the discharge pipe of a pump is usually _____________ the nominal size of the inlet pipe?


aSmaller than


bLarger than


cSame as


dTwice


View Answer Smaller than

The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the_________________?


aDischarge


bSuction


cSuction minus vapor pressure of the liquid at suction temperature


dDischarge minus vapor pressure of the liquid at the discharge temperature



Boundary layer thickness in turbulent flow over a flat plate increases as(where, d = distance from the leading edge.) ?


a√d


bd2/3


cd4/5


dd1/3


View Answer d4/5

Mach number is important in a fluid flow problem, when the inertia and _____________ forces predominate?


aElastic


bViscous


cGravity


dNone of these


View Answer Elastic

What is the ratio of fluid carrying capacity of two pipes having diameters d1 and d2 respectively ?


a(d1/d2)0.8


b(d1/d2)0.5


cd1/d2


d(d1/d2)2


View Answer (d1/d2)0.5

Momentum transfer in laminar flow of fluids results due to the_________________?


aViscosity


bDensity


cVelocity gradient


dNone of these


View Answer Velocity gradient

Cavitation in a centrifugal pump can be avoided by keeping the__________________?


aInlet pressure high


bOutlet pressure low


cInlet pressure low


dOutlet pressure high


View Answer Inlet pressure high

Stoke’s law is valid, when NRe, p is less than_________________?


a2


b100


c2100


d700


View Answer 2

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