E-PolyLearning

1. The expression given by following equation, gives the free energy change
a. with pressure changes at constant temperature.
b. under reversible isothermal volume change.
c. during heating of an ideal gas.
d. during cooling of an ideal gas.
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Answer: (a).with pressure changes at constant temperature.

2. The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by
a. A
b. B
c. C
d. D
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Answer: (d).D

3. Co-efficient of performance for a reversed Carnot cycle working between temperatures T₁ and T₂ (T₁ > T₂) is
a. A
b. B
c. C
d. D
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Answer: (a).A

4. Following is the mathematical expression for
a. Joule-Thomson co-efficient.
b. specific heat at constant pressure (Cp).
c. co-efficient of thermal expansion.
d. specific heat at constant volume (CV).
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Answer: (c).co-efficient of thermal expansion.

5. What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, Tʀ(where, T₁ and T₂ are source & surrounding temperatures respectively.)?
a. A
b. B
c. C
d. D
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Answer: (a).A

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