Chemical Engineering Thermodynamics

181. Fugacity is most helpful in

1. Representing actual behaviour of real gases
2. Representing actual behaviour of ideal gases
3. The study of chemical equilibria involving gases at atmospheric pressure
4. None of these

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182. Fugacity of a component in an ideal gas mixture is equal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at constant pressure and temperature _________ as its mole fraction increases.

1. Decreases
2. Decreases exponentially
3. Increases
4. Remain constant

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183. Fundamental principle of refrigeration is based on the _________ law of thermodynamics.

1. Zeroth
2. First
3. Second
4. Third

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184. Gases are cooled in Joule-Thomson expansion, when it is _________ inversion temperature.

1. Below
2. At
3. Above
4. Either 'b' or 'c'

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185. Generation of heat by friction is an example of a/an _________ change.

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

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186. Gibbs free energy (F) is defined as

1. F = E - TS
2. F = H - TS
3. F = H + TS
4. F = E + TS

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187. Gibbs free energy (G) is represented by, G = H - TS, whereas Helmholtz free energy, (A) is given by, A = E - TS. Which of the following is the Gibbs-Helmholtz equation?

1. [∂(G/T)/∂T] = - (H/T²)
2. [∂(A/T)/∂T]V = - E/T²
3. Both (A) and (B)
4. Neither (A) nor (B)

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188. Gibbs free energy at constant pressure and temperature under equilibrium conditions is

1. ∞
2. 0
3. Maximum
4. Minimum

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189. Gibbs free energy of a pure fluid approaches _________ as the pressure tends to zero at constant temperature.

1. Infinity
2. Minus infinity
3. Zero
4. None of these

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190. Gibbs free energy of mixing at constant pressure and temperature is always

1. 0
2. ∞
3. + ve
4. - ve

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