Chemical Engineering Thermodynamics

451. What is the degree of freedom for two miscible (non-reacting) substances in vapor-liquid equilibrium forming an azeotrope?

1. 0
2. 1
3. 2
4. 3

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452. What is the number of degree of freedom for a system of two miscible non-reacting species in vapor-liquid equilibrium forming an azeotrope?

1. 0
2. 2
3. 1
4. 3

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453. What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor?

1. 2
2. 0
3. 3
4. 1

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454. What is the ratio of adiabatic compressibility to isothermal compressibility?

1. 1
2. < 1
3. > 1
4. >> 1

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456. What is the value of ln y (where y = activity co-efficient) for ideal gases?

1. Zero
2. Unity
3. Infinity
4. Negative

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457. What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T₁ and T₂ are source & surrounding temperatures respectively.)?

1. T_R/(T₂ - T_R) × (T₁ - T₂)/T₁
2. T_R/(T₂ - T_R) × T₁/(T₁ - T₂)
3. T_R/(T₁ - T_R) × (T₁ - T₂)/T₁
4. None of these

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458. When a gas in a vessel expands, its internal energy decreases. The process involved is

1. Reversible
2. Irreversible
3. Isothermal
4. Adiabatic

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459. When a gas is subjected to adiabatic expansion, it gets cooled due to

1. Decrease in velocity
2. Decrease in temperature
3. Decrease in kinetic energy
4. Energy spent in doing work

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460. When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change. This is called the

1. Le-Chatelier principle
2. Kopp's rule
3. Law of corresponding state
4. Arrhenius hypothesis

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