Chemical Engineering Thermodynamics Question Bank - Set 27 - ObjectiveBooks
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Chemical Engineering Thermodynamics Question Bank - Set 27

Practice Test: Question Set - 27


1. What happens in a reversible adiabatic expansion process?
    (A) Heating takes place
    (B) Cooling takes place
    (C) Pressure is constant
    (D) Temperature is constant

2. Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to __________ °C.
    (A) 270
    (B) 327
    (C) 300
    (D) 540

3. Free energy changes for two reaction mechanism 'X' and 'Y are respectively - 15 and - 5 units. It implies that ‘X’ is
    (A) Slower than Y
    (B) Faster than Y
    (C) Three times slower than Y
    (D) Three times faster than Y

4. The change in Gibbs free energy for vaporization of a pure substance is
    (A) Positive
    (B) Negative
    (C) Zero
    (D) May be positive or negative

5. The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapor compression refrigeration system) is
    (A) Less pronounced
    (B) More pronounced
    (C) Equal
    (D) Data insufficient, can't be predicted

6. In any spontaneous process,
    (A) Only F decreases
    (B) Only A decreases
    (C) Both F and A decreases
    (D) Both F and A increase

7. Entropy change of the reaction, H2O (liquid) → H2O (gas), is termed as the enthalpy of
    (A) Solution
    (B) Vaporization
    (C) Formation
    (D) Sublimation

8. The partial pressure of each constituent present in an alloy is __________ the total vapor pressure exerted by the alloy.
    (A) Less than
    (B) Equal to
    (C) More than
    (D) Either (b) or (c); depends on the type of alloy

9. Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure __________with the increase of reduced temperature.
    (A) Decreases
    (B) Increases
    (C) Remains constant
    (D) Decreases logarithmically

10. In which of the following reaction equilibrium, the value of equilibrium constant Kp will be more than is Kc?
    (A) 2HI  H2 + I2
    (B) N2O4  2NO2
    (C) 2SO2 + O2  2SO3
    (D) None of these

11. The principle applied in liquefaction of gases is
    (A) Adiabatic expansion
    (B) Joule-Thomson effect
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

12. Pick out the wrong statement.
    (A) Surface tension of a substance vanishes at critical point, as there is no distinction between liquid and vapor phases at its critical point
    (B) Entropy of a system decreases with the evolution of heat
    (C) Change of internal energy is negative for exothermic reactions
    (D) The eccentric factor for all materials is always more than one

13. On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will
    (A) Increase
    (B) Decrease
    (C) Remain same
    (D) Increase in summer and will decrease in winter

14. In case of steady flow compression polytropic process (PVn = constant), the work done on air is the lowest, when
    (A) n = y = 1.4
    (B) n = 0
    (C) n = 1
    (D) = 1.66

15. __________ law of thermodynamics ascertains the direction of a particular spontaneous process.
    (A) Zeroth
    (B) First
    (C) Second
    (D) Third

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