Chemical Engineering MCQs

Page No. 149

A globe valve is the most suitable for applications, in which____________________?


aFluid flow control is required


bFluid contains dispersed solid particles


cValve is required to be either fully open or fully closed


dOne way flow is required



Buckingham-π theorem states that in any physical problem including ‘n’ quantities having ‘m’ dimensions, the quantities can be arranged into _____________ independent dimensionless parameters?


am


bn


cn-m


dn/m


View Answer n-m

When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an______________________?


aEjector


bBlower


cInjector


dAirlift


View Answer Airlift

The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is___________________?


a√(HW/π)


bHW/2 (H + W)2


cHW/4 (H + W)2


d2HW/(H + W)


View Answer HW/2 (H + W)2

At the critical point of a substance____________?


aThe surface tension vanishes


bLiquid and vapour have the same density


cThere is no distinction between liquid and vapour phases


dAll A, B. and C


View Answer All A, B. and C

Permanent pressure loss in a well designed Venturimeter is about _____________ percent of the venturi differential?


a1


b10


c30


d50


View Answer 10

For any system, what is the minimum number of degrees of freedom ?


a0


b1


c2


d3


View Answer 0

For an ideal fluid flow, Reynolds number is___________________?


a2100


b100


c0


d


View Answer

What is the degree of freedom for two miscible (non-reacting) substances in vapor-liquid equilibrium forming an azeotrope ?


a0


b 1


c 2


d 3


View Answer 2

The lift of a balloon is_________________?


aIncreased, as it rises to a higher altitude


bDue to the weight of the atmospheric air, that it displaces


cNot dependent on the temperature of the atmosphere


dNone of these



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