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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