A refrigeration cycle is a reversed heat engine. Which of the following has the

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Question
A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?
Options
A. Vapor compression cycle using expansion valve.
B. Air refrigeration cycle.
C. Vapor compression cycle using expansion engine.
D. Carnot refrigeration cycle.

Correct Answer

Carnot refrigeration cycle.

Chemical Engineering Thermodynamics problems

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1. Pick out the correct statement:
Options
A. In an isothermal system, irreversible work is more than reversible work.
B. Under reversible conditions, the adiabatic work is less than isothermal work.
C. Heat, work, enthalpy and entropy are all 'state functions'.
D. Matter and energy can not be exchanged with the surroundings in a closed system.

2. Pick out the wrong statement pertaining to the decomposition of PCl₅ represented by, PCl₅ ⇌ PCl₃ + Cl₂.Degree of dissociation of PCl₅ will
Options
A. decrease on addition of Cl₂.
B. increase on addition of an inert gas at constant pressure.
C. decrease on increasing the pressure of the system.
D. none of these

4. Boyle's law for gases states that
Options
A. , when temperature is constant.
B. , when temperature & mass of the gas remain constant.
C. P ? V, at constant temperature & mass of the gas.
D. = constant, for any gas.

5. "At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero". This follows from the
Options
A. third law of thermodynamics
B. second law of thermodynamics
C. Nernst heat theorem
D. Maxwell's relations

6. The accentric factor of a materical, '?', is defined as ? = -log₁₀(P_r^sat)T_r^-1 = 0.7, where, P_r^sat = reduced vapor pressure, T_r = reduced temperature. The value of accentric factor is always
Options
A. > 2
B. < 1
C. > 1
D. < 3

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