Chemical Engineering Thermodynamics

351. The compressibility factor of a gas is given by (where, V1 = actual volume of the gas V2 = gas volume predicted by ideal gas law)

  1. V1/V2
  2. V2/V1
  3. V1 - V2
  4. V1.V2

Correct answer: (A)
V1/V2

353. The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is

  1. Less pronounced
  2. More pronounced
  3. Equal
  4. Data insufficient, can't be predicted

Correct answer: (B)
More pronounced

354. 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

Correct answer: (A)
T1/(T1-T2)

355. The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be

  1. More
  2. Less
  3. Same
  4. Data insufficient to predict

Correct answer: (A)
More

356. The energy of activation of exothermic reaction is

  1. Zero
  2. Negative
  3. Very large compared to that for endothermic reaction
  4. Not possible to predict

Correct answer: (D)
Not possible to predict

357. The enthalpy change when ammonia gas is dissolved in water is called the heat of

  1. Solution
  2. Formation
  3. Dilution
  4. Combustion

Correct answer: (A)
Solution

358. The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is

  1. R loge 4
  2. R log10 4
  3. Cv log10 4
  4. Cv loge 4

Correct answer: (A)
R loge 4

359. The equation DU = Tds - PdV is applicable to infinitesimal changes occuring in

  1. An open system of constant composition
  2. A closed system of constant composition
  3. An open system with changes in composition
  4. A closed system with changes in composition

Correct answer: (D)
A closed system with changes in composition

360. The equation relating E, P, V and T which is true for all substances under all conditions is given by (∂E/∂V)T = T(∂P/∂T)H - P. This equation is called the

  1. Maxwell's equation
  2. Thermodynamic equation of state
  3. Equation of state
  4. Redlich-Kwong equation of state

Correct answer: (B)
Thermodynamic equation of state

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