Chemical Engineering Thermodynamics GATE Questions - Set 23 - ObjectiveBooks

Chemical Engineering Thermodynamics GATE Questions - Set 23

Practice Test: Question Set - 23

1. Which of the following has the least thermal efficiency?
    (A) Steam engine
    (B) Carnot engine
    (C) Diesel engine
    (D) Otto engine

2. The number of degrees of freedom for an azeotropic mixture in a two component vapor-liquid equilibria is/are
    (A) Zero
    (B) One
    (C) Two
    (D) Three

3. The point at which all the three (solid, liquid and gas) phases co-exist, is known as the __________ point.
    (A) Freezing
    (B) Triple
    (C) Boiling
    (D) Boyle

4. The freezing point of a liquid decreases when the pressure is increased, if the liquid __________ while freezing.
    (A) Contracts
    (B) Expands
    (C) Does not change in volume
    (D) Either (a), (b) or (c)

5. Specific volume of an ideal gas is
    (A) Equal to its density
    (B) The reciprocal of its density
    (C) Proportional to pressure
    (D) None of these

6. The compressibility factor of a gas is given by (where, V1 = actual volume of the gas V2 = gas volume predicted by ideal gas law)
    (A) V1/V2
    (B) V2/V1
    (C) V1 - V2
    (D) V1.V2

7. Dryness fraction of wet steam is defined as the ratio of mass of vapor in the mixture to the mass of mixture __________ calorimeter is not used for measuring the dryness fraction of steam.
    (A) Bomb
    (B) Separating
    (C) Bucket
    (D) Throttling

8. Molar heat capacity of water in equilibrium with ice at constant pressure is __________ Kcal/kg mole. °K
    (A) 0
    (C) 50
    (D) 100

9. The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same.
    (A) Kinematic viscosity
    (B) Work
    (C) Temperature
    (D) None of these

10. In any spontaneous process, the __________ free energy decreases.
    (A) Helmholtz
    (B) Gibbs
    (C) Both ‘a’ & ‘b’
    (D) Neither 'a' nor 'b'

11. The specific heat of saturated water vapor at 100°C is
    (B) -ve
    (C) 0
    (D) +ve

12. An isentropic process is carried out at constant
    (A) Volume
    (B) Pressure
    (C) Temperature
    (D) All (a), (b) and (c)

13. At 60° C, vapor pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapor phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is
    (A) 1.572
    (B) 1.9398
    (C) 3.389
    (D) 4.238

14. Entropy is a measure of the __________ of a system.
    (A) Disorder
    (B) Orderly behavior
    (C) Temperature changes only
    (D) None of these

15. What is the value of Joule-Thomson co-efficient for an ideal gas?
    (A) +ve
    (B) -ve
    (C) 0

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