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MCQs

Total Questions : 2096 | Page 2 of 210 pages
Question 11. What happens in a reversible adiabatic expansion process?
  1.    Heating takes place
  2.    Cooling takes place
  3.    Pressure is constant
  4.    Temperature is constant
 Discuss Question
Answer: Option B. -> Cooling takes place
Question 12. Which of the following is affected by the temperature?
  1.    Fugacity
  2.    Activity co-efficient
  3.    Free energy
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 13. Which is an example of closed system?
  1.    Air compressor
  2.    Lquid cooling system of an automobile
  3.    Boiler
  4.    None of these
 Discuss Question
Answer: Option B. -> Lquid cooling system of an automobile
Question 14. Entropy of an ideal gas depends upon its
  1.    Pressure
  2.    Temperature
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 15. At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by(where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.)
  1.    μ° + RT ln f
  2.    μ°+ R lnf
  3.    μ° + T lnf
  4.    μ° + R/T lnf
 Discuss Question
Answer: Option A. -> μ° + RT ln f
Question 16. Partial molal quantities are important in the study of
  1.    Ideal gases
  2.    Ideal solutions
  3.    Non-ideal mixtures
  4.    A pure component
 Discuss Question
Answer: Option C. -> Non-ideal mixtures
Question 17. For organic compounds, group contribution method can be used for the estimation of
  1.    Critical properties
  2.    Specific gravity
  3.    Specific volume
  4.    Thermal conductivity
 Discuss Question
Answer: Option A. -> Critical properties
Question 18. The efficiency of a Carnot heat engine operating between absolute temperatures T₁ and T₂ (when, T₁ > T₂) is given by (T₁ - T₂)/T₁. The co-efficient of performance (C.O.P.) of a Carnot heat pump operating between T₁ and T₂ is given by
  1.    T₁/(T₁-T₂)
  2.    T₂/(T₁-T₂)
  3.    T₁/T₂
  4.    T₂/R1
 Discuss Question
Answer: Option A. -> T₁/(T₁-T₂)
Question 19. Internal energy of an element at 1 atm and 25° C is __________ kcal/kg.mole.
  1.    0
  2.    273
  3.    25
  4.    None of these
 Discuss Question
Answer: Option A. -> 0
Question 20. At the critical point of a substance
  1.    The surface tension vanishes
  2.    Liquid and vapour have the same density
  3.    There is no distinction between liquid and vapour phases
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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