A. Fugacity
B. Activity co-efficient
C. Free energy
D. All of the above
✅ The correct answer is option D.
Chemical Engineering MCQs
Co-efficient of Performance (COP) of a refrigerator is the ratio of the
A. Work required to refrigeration obtained
B. Refrigeration obtained to the work required
C. Lower to higher temperature
D. Higher to lower temperature
✅ The correct answer is option B.
In jet refrigerators, the refrigerating fluid is practically always
A. Water
B. Ammonia
C. Freon
D. Brine
✅ The correct answer is option A.
Co-efficient of performance for a reversed Carnot cycle working between temperatures T₁ and T₂ (T₁ > T₂) is
A. T₂/(T₁ – T₂)
B. T₁/(T₁ – T₂)
C. (T₁ – T₂)/T₁
D. (T₁ – T₂)/T₂
✅ The correct answer is option A.
Entropy of a substance remains constant during a/an __________ change.
A. Reversible isothermal
B. Irreversible isothermal
C. Reversible adiabatic
D. None of these
✅ The correct answer is option C.
Entropy change for an irreversible isolated system is
A. ∞
B. 0
C. < 0
D. > 0
✅ The correct answer is option D.
Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).
A. Entropy
B. Internal energy
C. Enthalpy
D. Gibbs free energy
✅ The correct answer is option D.
Partial molal quantities are important in the study of
A. Ideal gases
B. Ideal solutions
C. Non-ideal mixtures
D. A pure component
✅ The correct answer is option C.
Second law of thermodynamics is concerned with the
A. Amount of energy transferred
B. Direction of energy transfer
C. Irreversible processes only
D. Non-cyclic processes only
✅ The correct answer is option B.
Gibbs-Duhem equation relates composition in liquid phase and the __________ at constant temperature & pressure.
A. Fugacity
B. Partial pressure
C. Activity co-efficient
D. A, B, and C
✅ The correct answer is option D.