πChemical Engineering MCQs
Chemical Engineering MCQs
496 MCQs21
Which of the following is not affected by temperature changes ?
AFugacity
BActivity co-efficient
CFree energy
DNone of these
22
Maximum work that could be secured by expanding the gas over a given pressure range is the _____________ work?
AIsothermal
BAdiabatic
CIsentropic
DNone of these
23
Second law of thermodynamics is concerned with the_________________?
AAmount of energy transferred
BDirection of energy transfer
CIrreversible processes only
DNon-cyclic processes only
24
Which law of the thermodynamics provides basis for measuring the thermodynamic property ?
AFirst law
BZeroth law
CThird law
DSecond law
25
Cp of a gas at its critical temperature and pressure_______________?
ABecomes zero
BBecomes infinity
CEquals 1 kcal/kmol Β°K
DEquals 0.24 kcal/kmol Β°K
26
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
DIncreased or decreased COP; depending upon the type of refrigerant
27
βAt the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zeroβ. This follows from the __________________?
AThird law of thermodynamics
BSecond law of thermodynamics
CNernst heat theorem
DMaxwellβs relations
28
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 (βP/βV)s and the slope of the reversible isothermal line (βP/βV)T are related as (where, y = Cp/Cv) ?
A(βP/βV)S = (βP/βV)T
B(βP/βV)S = [(βP/βV)T]Y
C(βP/βV)S = y(βP/βV)T
D(βP/βV)S = 1/y(βP/βV)T
29
In the reaction, C + O2 β CO2; ΞH = β 94 kcal. What is the heat content (enthalpy) of O2 ?
A-94 kcal
B> -94 kcal
CD. Zero
30
Refrigeration cycle_________________?
Anor B
BInvolves transfer of heat from low temperature to high temperature
CBoth
DNeither