Chemical Engineering Thermodynamics

11. (∂T/∂P)H is the mathematical expression for

  1. Specific heat at constant pressure (Cp)
  2. Specific heat at constant volume (Cv)
  3. Joule-Thompson co-efficient
  4. None of these

Correct answer: (C)
Joule-Thompson co-efficient

12. (1/V) (∂V/∂T)P is the mathematical expression

  1. Joule-Thomson co-efficient
  2. Specific heat at constant pressure (Cp)
  3. co-efficient of thermal expansion
  4. Specific heat at constant volume (CV)

Correct answer: (C)
co-efficient of thermal expansion

13. “The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture". This is

  1. The statement as per Gibbs-Helmholtz
  2. Called Lewis-Randall rule
  3. Henry's law
  4. None of these

Correct answer: (B)
Called Lewis-Randall rule

14. 1m3 of an ideal gas at 500 K and 1000 kPa expands reversibly to 5 times its initial volume in an insulated container. If the specific heat capacity (at constant pressure) of the gas is 21 J/mole . K, the final temperature will be

  1. 35 K
  2. 174 K
  3. 274 K
  4. 154 K

Correct answer: (C)
274 K

15. 1st law of thermodynamics is nothing but the law of conservation of

  1. Momentum
  2. Mass
  3. Energy
  4. None of these

Correct answer: (C)
Energy

16. 4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is

  1. 4 J
  2. ∞
  3. 0
  4. 8 J

Correct answer: (C)
0

17. A Carnot cycle consists of the following steps:

  1. Two isothermal and two isentropic
  2. Two isobaric and two isothermal
  3. Two isochoric and two isobaric
  4. Two isothermals and two isochoric

Correct answer: (A)
Two isothermal and two isentropic

18. A change in state involving a decrease in entropy can be spontaneous, only if

  1. It is exothermic
  2. It is isenthalpic
  3. It takes place isothermally
  4. It takes place at constant volume

Correct answer: (A)
It is exothermic

19. A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is

  1. Zero
  2. Positive
  3. Negative
  4. None of these

Correct answer: (C)
Negative

20. A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system

  1. its internal energy (U) decreases and its entropy (S) increases
  2. U and S both decreases
  3. U decreases but S is constant
  4. U is constant but S decreases

Correct answer: (B)
U and S both decreases

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