Chemical Engineering Thermodynamics

311. Pick out the wrong statement

  1. Phase rule variables are intensive properties
  2. Heat and work are both state function
  3. The work done by expansion of a gas in vacuum is zero
  4. CP and CV are state function

Correct answer: (B)
Heat and work are both state function

312. Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5 ⇌ PCl3 + Cl2.Degree of dissociation of PCl5 will

  1. Decrease on addition of Cl2
  2. Increase on addition of an inert gas at constant pressure
  3. Decrease on increasing the pressure of the system
  4. None of these

Correct answer: (D)
None of these

313. Pick out the wrong statement.

  1. An ideal liquid or solid solution is defined as one in which each component obeys Raoult's law
  2. If Raoult's law is applied to one component of a binary mixture; Henry's law or Raoult's law is applied to the other component also
  3. Henry's law is rigorously correct in the limit of infinite dilution
  4. None of these

Correct answer: (D)
None of these

314. Pick out the wrong statement:

  1. The expansion of a gas in vacuum is an irreversible process
  2. An isometric process is a constant pressure process
  3. Entropy change for a reversible adiabatic process is zero
  4. Free energy change for a spontaneous process is negative

Correct answer: (B)
An isometric process is a constant pressure process

315. Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is

  1. Positive
  2. Negative
  3. Zero
  4. Infinity

Correct answer: (C)
Zero

316. PVγ = Constant (where, γ = Cp/Cv) is valid for a/an _________ process.

  1. Isothermal
  2. Isentropic
  3. Isobaric
  4. Adiabatic

Correct answer: (D)
Adiabatic

317. PVy = constant, holds good for an isentropic process, which is

  1. Reversible and isothermal
  2. Isothermal and irreversible
  3. Reversible and adiabatic
  4. Adiabatic and irreversible

Correct answer: (C)
Reversible and adiabatic

318. Reduced pressure of a gas is the ratio of its

  1. Pressure to critical pressure
  2. Critical pressure to pressure
  3. Pressure to pseudocritical pressure
  4. Pseudocritical pressure to pressure

Correct answer: (A)
Pressure to critical pressure

319. Refrigerants commonly used for domestic refrigerators are

  1. Ethyl chloride or methyl chloride
  2. Freon-12
  3. Propane
  4. NH3 or CO2

Correct answer: (A)
Ethyl chloride or methyl chloride

320. Refrigeration capacity of a household refrigerator may be round about _________ tons.

  1. 0.15
  2. 1.5
  3. 4.5
  4. 6.5

Correct answer: (A)
0.15

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