Chemical Engineering Thermodynamics Exam Online Questions - Set 22 - ObjectiveBooks

# Practice Test: Question Set - 22

1. For an ideal gas, the activity co-efficient is
(A) Directly proportional to pressure
(B) Inversely proportional to pressure
(C) Unity at all pressures
(D) None of these

2. As the time is passing, entropy of the universe
(A) Is increasing
(B) Is decreasing
(C) Remain constant
(D) Data insufficient, can't be predicted

3. In the equation, PVn = constant, if the value of n = ± ∞, then it represents a reversible __________ process.
(B) Isometric
(C) Isentropic
(D) Isothermal

4. The acentric factor of a materical, 'ω', is defined as ω = -log10(Prsat)Tr-1 = 0.7, where, Prsat = reduced vapor pressure, Tr = reduced temperature. The value of acentric factor is always
(A) > 2
(B) < 1
(C) > 1
(D) < 3

5. Which of the following is not an intensive property?
(A) Volume
(B) Density
(C) Temperature
(D) Pressure

6. "If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them". This is __________ law.
(A) Hess's
(B) Kirchoff's
(C) Lavoisier and Laplace
(D) None of these

7. Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg. K, entropy of saturated vapor = 7.2234 kJ/kg. K) The exit condition of steam is
(A) Superheated vapor
(B) Partially condensed vapor with quality of 0.9
(C) Saturated vapor
(D) Partially condensed vapor with quality of 0.1

8. A gas can be liquefied by pressure alone only, when its temperature is __________ its critical temperature.
(A) Less than
(B) More than
(C) Equal to or higher than
(D) Less than or equal to

9. The expression, ∆G = nRT. ln(P2/P1), gives the free energy change
(A) With pressure changes at constant temperature
(B) Under reversible isothermal volume change
(C) During heating of an ideal gas
(D) During cooling of an ideal gas

10. Heat is added at constant temperature in an ideal __________ cycle.
(A) Stirling
(B) Brayton
(C) Rankine
(D) None of these

11. What is the degree of freedom for two miscible (non-reacting) substances in vapor-liquid equilibrium forming an azeotrope?
(A) 0
(B) 1
(C) 2
(D) 3

12. Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of
(A) Fusion
(B) Vaporization
(C) Transition
(D) None of these

13. For any system, what is the minimum number of degrees of freedom?
(A) 0
(B) 1
(C) 2
(D) 3

14. Solubility of a substance which dissolves with an increase in volume and liberation of heat will be favored by the
(A) Low pressure and high temperature
(B) Low pressure and low temperature
(C) High pressure and low temperature
(D) High pressure and high temperature

15. At the critical point of a substance
(A) The surface tension vanishes
(B) Liquid and vapor have the same density
(C) There is no distinction between liquid and vapor phases
(D) All (a), (b) and (c)

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