Chemical Engineering MCQs

Page No. 104

Which of the following identities can be most easily used to verify steam table data for superheated steam ?


a(∂T/∂V)S = (∂p/∂S)V


b(∂T/∂P)S = (∂V/∂S)P


c (∂P/∂T)V = (∂S/∂V)T


d(∂V/∂T)P = -(∂S/∂P)T



In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in_____________?


aEnhanced COP


bDecreased COP


cNo change in the value of COP


d Increased or decreased COP; depending upon the type of refrigerant


View Answer Enhanced COP

“At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero”. This follows from the __________________?


aThird law of thermodynamics


b Second law of thermodynamics


c Nernst heat theorem


dMaxwell’s relations



On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)s and the slope of the reversible isothermal line (∂P/∂V)T are related as (where, y = Cp/Cv) ?


a(∂P/∂V)S = (∂P/∂V)T


b(∂P/∂V)S = [(∂P/∂V)T]Y


c (∂P/∂V)S = y(∂P/∂V)T


d (∂P/∂V)S = 1/y(∂P/∂V)T



An irreversible process____________________?


aIs the analog of linear frictionless motion in machines


b Is an idealised visualisation of behaviour of a system


c Yields the maximum amount of work


d Yields an amount of work less than that of a reversible process



When a system is in equilibrium for all possible processes, the differential or finite change of entropy is__________________?


a< 0


b > 0


c= 0


dNone of these


View Answer < 0

Ideal refrigeration cycle is____________________?


a Same as Carnot cycle


bSame as reverse Carnot cycle


cDependent on the refrigerant’s properties


dThe least efficient of all refrigeration processes



In a working refrigerator, the value of COP is always__________________?


a0


b< 0


c < 1


d > 1


View Answer > 1

The internal energy of an incompressible fluid depends upon its_________________?


aPressure


bTemperature


c Both A. & B


dNeither A. nor B


View Answer Temperature

Cv for an ideal gas__________________?


aDoes not depend upon temperature


b Is independent of pressure only


c Is independent of volume only


d Is independent of both pressure and volume



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