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MCQs

Total Questions : 2096 | Page 4 of 210 pages
Question 31. The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is
  1.    (∂T/∂V)S = -(∂P/∂S)V
  2.    (∂S/∂P)T = -(∂V/∂T)P
  3.    (∂V/∂S)P = (∂T/∂P)S
  4.    (∂S/∂V)T = (∂P/∂T)V
 Discuss Question
Answer: Option D. -> (∂S/∂V)T = (∂P/∂T)V
Question 32. Heat is added at constant pressure in an ideal __________ cycle.
  1.    Stirling
  2.    Brayton
  3.    Rankine
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C
Question 33. Which of the following processes can not be made reversible even under ideal condition of operation?
  1.    Free expansion of a gas
  2.    Compression of air in a compressor
  3.    Expansion of steam in a turbine
  4.    All of the above
 Discuss Question
Answer: Option A. -> Free expansion of a gas
Question 34. Heat is added at constant temperature in an ideal __________ cycle.
  1.    Stirling
  2.    Brayton
  3.    Rankine
  4.    None of these
 Discuss Question
Answer: Option A. -> Stirling
Question 35. 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
 Discuss Question
Answer: Option C. -> Both A & B
Question 36. For a constant volume process __________ by the system is used only to increase the internal energy.
  1.    Heat absorbed
  2.    Work done
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option A. -> Heat absorbed
Question 37. Which of the following is not a reversible process ?
  1.    Expansion of an ideal gas against constant pressure
  2.    Atmospheric pressure vaporisation of water at 100°C
  3.    Solution of NaCl in water at 50°C
  4.    None of these
 Discuss Question
Answer: Option C. -> Solution of NaCl in water at 50°C
Question 38. Which of the following is not a common refrigerant?
  1.    Freon-12
  2.    Ethylene
  3.    Ammonia
  4.    Carbon dioxide
 Discuss Question
Answer: Option B. -> Ethylene
Question 39. A gas performs the maximum work, when it expands
  1.    Non-uniformly
  2.    Adiabatically
  3.    Isobarically
  4.    Isothermally
 Discuss Question
Answer: Option C. -> Isobarically
Question 40. For spontaneous changes in an isolated system (S = entropy)
  1.    Ds = 0
  2.    Ds
  3.    Ds > 0
  4.    Ds = Constant
 Discuss Question
Answer: Option C. -> Ds > 0

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