Chemical Engineering Thermodynamics

361. The equation Tds = dE - PdV applies to

  1. Single phase fluid of varying composition
  2. Single phase fluid of constant composition
  3. Open as well as closed systems
  4. Both (B) and (C)

Correct answer: (D)
Both (B) and (C)

362. The equation, (d loge PA/d loge xA) = (d loge PA/d loge xB) applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the _________ equation.

  1. Van Laar
  2. Margules
  3. Gibbs-Duhem
  4. Gibbs-Duhem-Margules

Correct answer: (D)
Gibbs-Duhem-Margules

363. The equation, Cp - Cv = R, is true for _________ gas.

  1. No
  2. Any real
  3. Only ideal
  4. Both (B) and (C)

Correct answer: (C)
Only ideal

364. The equation, PV = nRT, is best obeyed by gases at

  1. Low pressure & high temperature
  2. High pressure & low temperature
  3. Low pressure & low temperature
  4. None of these

Correct answer: (A)
Low pressure & high temperature

365. The equilibrium constant for a chemical reaction at two different temperatures is given by

  1. Kp2/Kp1 = - (ΔH/R) (1/T2 - 1/T1)
  2. Kp2/Kp1 = (ΔH/R) (1/T2 - 1/T1)
  3. Kp2/Kp1 = ΔH (1/T2 - 1/T1)
  4. Kp22/Kp1 = - (1/R) (1/T2 - 1/T1)

Correct answer: (A)
Kp2/Kp1 = - (ΔH/R) (1/T2 - 1/T1)

366. The expression for entropy change given by, ΔS = - nR ln (P2/P1), holds good for

  1. Expansion of a real gas
  2. Reversible isothermal volume change
  3. Heating of an ideal gas
  4. Cooling of a real gas

Correct answer: (B)
Reversible isothermal volume change

367. The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for

  1. Reversible isothermal volume change
  2. Heating of a substance
  3. Cooling of a substance
  4. Simultaneous heating and expansion of an ideal gas

Correct answer: (D)
Simultaneous heating and expansion of an ideal gas

368. The expression for entropy change, ΔS = n Cp . ln (T2/T1), is valid for the _________ of a substance.

  1. Simultaneous pressure & temperature change
  2. Heating
  3. Cooling
  4. Both (B) and (C)

Correct answer: (D)
Both (B) and (C)

369. The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible _________ process.

  1. Isobaric
  2. Isothermal
  3. Adiabatic
  4. None of these

Correct answer: (B)
Isothermal

370. The expression, ΔG = nRT. ln(P2/P1), gives the free energy change

  1. With pressure changes at constant temperature
  2. Under reversible isothermal volume change
  3. During heating of an ideal gas
  4. During cooling of an ideal gas

Correct answer: (A)
With pressure changes at constant temperature

Previous
Page 37 of 52
Next
Copyright © EngineeringMCQ.com