Chemical Engineering Thermodynamics

411. The second law of thermodynamics states that

1. The energy change of a system undergoing any reversible process is zero
2. It is not possible to transfer heat from a lower temperature to a higher temperature
3. The total energy of system and surrounding remains the same
4. None of the above

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412. The shape of T-S diagram for Carnot Cycle is a

1. Rectangle
2. Rhombus
3. Trapezoid
4. Circle

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414. The standard Gibbs free energy change of a reaction depends on the equilibrium

1. Pressure
2. Temperature
3. Composition
4. All (A), (B) and (C)

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415. The standard state of a gas (at a given temperature) is the state in which fugacity is equal to

1. Unity
2. Activity
3. Both (A) & (B)
4. Neither (A) nor (B)

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416. The temperature at the eutectic point of the system is the _________ temperature that can be attained in the system.

1. Lowest
2. Highest
3. Average
4. None of these

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417. The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the _________ temperature.

1. Critical
2. Boyle
3. Inversion
4. Reduced

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418. The temperature at which both liquid and gas phases are identical, is called the _________ point.

1. Critical
2. Triple
3. Freezing
4. Boiling

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419. The theoretical minimum work required to separate one mole of a liquid mixture at 1 atm, containing 50 mole % each of n- heptane and n- octane into pure compounds each at 1 atm is

1. -2 RT ln 0.5
2. -RT ln 0.5
3. 0.5 RT
4. 2 RT

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420. The thermodynamic law, PVy = constant, is not applicable in case of

1. Ideal compression of air
2. Free expansion of an ideal gas
3. Adiabatic expansion of steam in a turbine
4. Adiabatic compression of a perfect gas

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