Chemical Engineering Thermodynamics Objective Questions & Answers - ObjectiveBooks

# Practice Test: Question Set - 36

1. Which is not a refrigerant?
(A) SO2
(B) NH3
(C) CCl2F2
(D) C2H4Cl2

2. The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the __________ temperature.
(A) Critical
(B) Boyle
(C) Inversion
(D) Reduced

3. When liquid and vapor phase of multi-component system are in equilibrium (at a given temperature and pressure), then chemical potential of each component is
(A) Same in both the phases
(B) Zero in both the phases
(C) More in vapor phase
(D) More in liquid phase

4. Mollier diagram is a plot of
(A) Temperature vs. enthalpy
(B) Temperature vs. enthalpy
(C) Entropy vs. enthalpy
(D) Temperature vs. internal energy

5. The value of gas constant 'R' is
(A) 1.987 cal/gm mole °K
(B) 1.987 BTU/lb. mole °R
(C) Both (a) and (b)
(D) Neither (a) nor (b)

6. At triple point (for one component system), vapor pressure of solid as compared to that of liquid will be
(A) More
(B) Less
(C) Same
(D) More or less; depending on the system

7. The unity of Planck's constant 'h' in the equation, E = hv is
(A) J/s
(B) J.S
(C) J/kmol
(D) kmol/J

8. Equation which relates pressure, volume and temperature of a gas is called the
(A) Equation of state
(B) Gibbs Duhem equation
(C) Ideal gas equation
(D) None of these

9. COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about
(A) 0.5
(B) 3.5
(C) 4.5
(D) 8.5

10. Pick out the wrong statement.
(A) Cp of monatomic gases such as metallic vapor is about 5 kcal/kg.atom
(B) The heat capacity of solid inorganic substance is exactly equal to the heat capacity of the substance in the molten state
(C) There is an increase in entropy, when a spontaneous change occurs in an isolated system
(D) At absolute zero temperature, the heat capacity for many pure crystalline substances is zero

11. In an isothermal process on an ideal gas, the pressure increases by 0.5 percent. The volume decreases by about __________ percent.
(A) 0.25
(B) 0.5
(C) 0.75
(D) 1

12. Which of the following is not correct for a reversible adiabatic process?
(A) TVγ-1 = constant
(B) p1-γ.TY = constant
(C) PVγ = constant
(D) None of these

13. Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in
(A) Increased COP
(B) Same COP
(C) Decreased COP
(D) Increased or decreased COP; depending upon the type of refrigerant

14. The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called __________ temperature.
(A) Boyle
(B) Inversion
(C) Critical
(D) Reduced

15. "When a gas is expanded from high pressure region to low pressure region; temperature change occurs". This phenomenon is related to the
(A) Gibbs-Duhem equation
(B) Gibbs-Helmholtz equation
(C) Third law of thermodynamics
(D) Joule-Thomson effect

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