Chemical Engineering Thermodynamics

431. The work done in isothermal compression compared to that in adiabatic compression will be

1. Less
2. More
3. Same
4. More or less depending upon the extent of work done

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432. There is a change in _________ during the phase transition.

1. Volume
2. Pressure
3. Temperature
4. All a, b & c

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433. Thermal efficiency of a Carnot engine can approach 100%, only when the temperature of the

1. Cold reservoir approaches zero
2. Hot reservoir approaches infinity
3. Either (A) or (B)
4. Neither (A) nor (B)

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434. Third law of thermodynamics is concerned with the

1. Value of absolute entropy
2. Energy transfer
3. Direction of energy transfer
4. None of these

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435. Third law of thermodynamics is helpful in

1. Prediction of the extent of a chemical reaction
2. Calculating absolute entropies of substances at different temperature
3. Evaluating entropy changes of chemical reaction
4. Both (B) and (C)

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436. Those solutions in which there is no volume change upon mixing the components in the liquid state and which, when diluted do not undergo any heat change (i.e. heat of dilution is zero), are called _________ solutions.

1. Ideal
2. Real
3. Isotonic
4. None of these

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437. Throttling (Joule-Thomson effect) process is a constant _________ process.

1. Enthalpy
2. Entropy
3. Pressure
4. None of these

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438. Throttling process is a/an _________ process.

1. Reversible and isothermal
2. Irreversible and constant enthalpy
3. Reversible and constant entropy
4. Reversible and constant enthalpy

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439. To obtain integrated form of Clausius-Clapeyron equation, ln (P₂/P₁) = (ΔHV/R) (1/T₁ - 1/T₂) from the exact Clapeyron equation, it is assumed that the

1. Volume of the liquid phase is negligible compared to that of vapour phase
2. Vapour phase behaves as an ideal gas
3. Heat of vaporisation is independent of temperature
4. All (A), (B) & (C)

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440. Translational kinetic energy of molecules of an ideal gas is proportional to (where, T = absolute temperature of the gas)

1. T
2. √T
3. T₂
4. 1/√T

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