A. Positive
B. Negative
C. Zero
D. May be positive or negative
A. Enthalpy does not remain constant
B. Entire apparatus is exposed to surroundings
C. Temperature remains constant
D. None of these
A. Van Laar
B. Margules
C. Gibbs-Duhem
D. Gibbs-Duhem-Margules
A. An open system of constant composition
B. A closed system of constant composition
C. An open system with changes in composition
D. A closed system with changes in composition
A. +ve
B. -ve
C. 0
D. ∞
A. CV
B. Entropy change
C. Gibbs free energy
D. None of these
A. Is the most efficient of all refrigeration cycles
B. Has very low efficiency
C. Requires relatively large quantities of air to achieve a significant amount of refrigeration
D. Both B. and C