๐ญChemical Engineering MCQs
Chemical Engineering MCQs
496 MCQs211
Specific/molar Gibbs free energy for a pure substance does not change during________________?
ASublimation
Bor
CMelting
DEither A,
212
The expression, nCv(T2 โ T1), is for the _____________ of an ideal gas?
AWork done under adiabatic condition
BCo-efficient of thermal expansion
CCompressibility
DNone of these
213
Which of the following has the minimum value of COP for a given refrigeration effect ?
AReverse Carnot cycle
BOrdinary vapour-compression cycle
CVapour-compression process with a reversible expansion engine
DAir refrigeration cycle
214
Partial molar free energy of an element A in solution is same as its__________________?
AChemical potential
BActivity
CFugacity
DActivity co-efficient
215
Entropy of the system decreases, when_______________?
ASnow melts into water
B& C
CWater is converted into ice
DBoth
216
If heat contents of CH4, C2H4 and C3H8 are -17.9, 12.5 and -24.8 kcal/mole respectively, than ฮH for the reaction CH4(g) + C2H4(g) โ C3H8(g) will be _____________ Kcal?
A-19.4
B-30.2
C55.2
D-55.2
217
Which of the following liquid metals has the highest thermal conductivity ?
AMolten sodium
BMolten lead
CMercury
DMolten potassium
218
High _____________ is an undesirable property for a good refrigerant?
ASpecific heat
BLatent heat of vaporisation
CViscosity
DSpecific vapor volume
219
Specific _____________ does not change during phase change at constant temperature and pressure?
AEntropy
BGibbs energy
CInternal energy
DEnthalpy
220
A change in state involving a decrease in entropy can be spontaneous, only if ____________________?
AIt is exothermic
BIt is isenthalpic
CIt takes place isothermally
DIt takes place at constant volume