Chemical Engineering Thermodynamics Questions and Answers pdf - Set 25 - ObjectiveBooks
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Chemical Engineering Thermodynamics Questions and Answers pdf - Set 25

Practice Test: Question Set - 25


1. Number of components (C), phase (P) and degrees of freedom (F) are related by Gibbs phase rule as
    (A) P + F - C = 2
    (B) C = P - F + 2
    (C) F = C - P - 2
    (D) P = F - C - 2

2. Degree of freedom of a system consisting of a gaseous mixture of H2 and NH3 will be
    (A) 0
    (B) 1
    (C) 2
    (D) 3

3. Gases are cooled in Joule-Thomson expansion, when it is __________ inversion temperature.
    (A) Below
    (B) At
    (C) Above
    (D) Either 'b' or 'c'

4. Joule-Thomson experiment is
    (A) Isobaric
    (B) Adiabatic
    (C) Isenthalpic
    (D) Both (b) & (c)

5. The amount of heat required to decompose a compound into its elements is __________ the heat of formation of that compound from its elements.
    (A) Less than
    (B) More than
    (C) Same as
    (D) Not related to

6. The following heat engine produces power of 100,000 kW. The heat engine operates between 800 K and 300 K. It has a thermal efficiency equal to 50% of that of the Carnot engine for the same temperature. The rate at which heat is absorbed from the hot reservoir is
    (A) 100,000 kW
    (B) 160,000 kW
    (C) 200,000 kW
    (D) 320,000 kW

7. In reactions involving solids and liquids (where change in volume is negligible), the heat of reaction at constant pressure as compared to that at constant volume is
    (A) More
    (B) Less
    (C) Same
    (D) Unpredictable; depends on the particular reaction

8. The standard state of a gas (at a given temperature) is the state in which fugacity is equal to
    (A) Unity
    (B) Activity
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

9. Which of the following is a thermodynamic property of a system?
    (A) Concentration
    (B) Mass
    (C) Temperature
    (D) Entropy

10. As the entropy of the universe is increasing, day by day, the work producing capacity of a heat engine is
    (A) Not changed
    (B) Decreasing
    (C) Increasing
    (D) Data sufficient, can't be predicted

11. As the temperature is lowered towards the absolute zero, the value of ∂(∆F)/∂T, then approaches
    (A) Unity
    (B) Zero
    (C) That of the heat of reaction
    (D) Infinity

12. Fugacity co-efficient of a substance is the ratio of its fugacity to
    (A) Mole fraction
    (B) Activity
    (C) Pressure
    (D) Activity co-efficient

13. PVy = constant, holds good for an isentropic process, which is
    (A) Reversible and isothermal
    (B) Isothermal and irreversible
    (C) Reversible and adiabatic
    (D) Adiabatic and irreversible

14. A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?
    (A) Vapor compression cycle using expansion valve
    (B) Air refrigeration cycle
    (C) Vapor compression cycle using expansion engine
    (D) Carnot refrigeration cycle

15. With increase in pressure (above atmospheric pressure), the Cp of a gas
    (A) Increases
    (B) Decreases
    (C) Remains unchanged
    (D) First decreases and then increases

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