Chemical Engineering Thermodynamics

251. In the equation, PVn = Constant, if the value of n = 0, then it represents a reversible _________ process.

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

Correct answer: (A)
Isobaric

252. In the equation, PVn = constant, if the value of n = 1, then it represents a reversible _________ process.

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

Correct answer: (A)
Isothermal

253. In the equation, PVn = constant, if the value of n is in between 1 and y (i.e. Cp/Cv), then it represents a reversible _________ process.

  1. Isometric
  2. Polytropic
  3. Isentropic
  4. Isobaric

Correct answer: (B)
Polytropic

254. In the reaction, C + O2 → CO2; ΔH = - 94 kcal. What is the heat content (enthalpy) of O2?

  1. -94 kcal
  2. > -94 kcal
  3. < - 94 kcal
  4. Zero

Correct answer: (D)
Zero

255. In the reaction, H2 +I2 ⇌ 2HI, addition of an inert gas will

  1. Increase the partial pressure of H2
  2. Increase the partial pressure of I2
  3. Increase the total pressure and hence shift the equilibrium towards the right
  4. Not affect the equilibrium conditions

Correct answer: (D)
Not affect the equilibrium conditions

256. In the reaction, represented by, 2SO2 + O2 ⇌ 2SO3; ΔH = - 42 kcal; the forward reaction will be favoured by

  1. Low temperature
  2. High pressure
  3. Both (A) and (B)
  4. Neither (A) nor (B)

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

257. In the reaction; N2 + O2 ⇌ 2NO, increasing the pressure will result in

  1. Shifting the equilibrium towards right
  2. Shifting the equilibrium towards left
  3. No change in equilibrium condition
  4. None of these

Correct answer: (C)
No change in equilibrium condition

258. In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13°C and 37°C respectively, the Carnot COP will be

  1. 5.2
  2. 6.2
  3. 0.168
  4. Data insufficient, can't be found out

Correct answer: (A)
5.2

259. In which of the following reaction equilibrium, the value of equilibrium constant Kp will be more than is Kc?

  1. 2HI ⇌ H2 + I2
  2. N2O4 ⇌ 2NO2
  3. 2SO2 + O2 ⇌ 2SO3
  4. None of these

Correct answer: (B)
N2O4 ⇌ 2NO2

260. Internal energy change of a system over one complete cycle in a cyclic process is

  1. Zero
  2. =+ve
  3. =-ve
  4. Dependent on the path

Correct answer: (A)
Zero

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