Chemical Engineering Thermodynamics Notes Questions - Set 15 - ObjectiveBooks

# Practice Test: Question Set - 15

1. In case of vapor compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in
(A) Enhanced COP
(B) Decreased COP
(C) No change in the value of COP
(D) Increased or decreased COP; depending upon the type of refrigerant

2. Which of the following identities can be most easily used to verify steam table data for superheated steam?
(A) (∂T/∂V)S = (∂p/∂S)V
(B) (∂T/∂P)S = (∂V/∂S)P
(C) (∂P/∂T)V = (∂S/∂V)T
(D) (∂V/∂T)P = -(∂S/∂P)T

3. The third law of thermodynamics states that the
(A) Heat capacity of a crystalline solid is zero at absolute zero temperature
(B) Heat transfer from low temperature to high temperature source is not possible without external work
(C) Gases having same reduced properties behaves similarly
(D) None of these

4. 1st law of thermodynamics is nothing but the law of conservation of
(A) Momentum
(B) Mass
(C) Energy
(D) None of these

5. Vapor which is at a pressure smaller than the saturation pressure for the temperature involved is called a __________ vapor.
(A) Superheated
(B) Desuperheated
(C) Non-condensable
(D) None of these

6. An ideal liquid refrigerant should
(A) Not have a sub-atmospheric vapor pressure at the temperature in the refrigerator coils
(B) Not have unduly high vapor pressure at the condenser temperature
(C) Both (a) and (b)
(D) Have low specific heat

7. High pressure steam is expanded adiabatically and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by Î”H and Î”S respectively for this process:
(A) Î” H = 0 and Î”S = 0
(B) Î” H ≠ 0 and Î”S = 0
(C) Î” H ≠ 0 and Î”S ≠ 0
(D) Î” H = 0 and Î”S ≠ 0

8. Cp of a gas at its critical temperature and pressure
(A) Becomes zero
(B) Becomes infinity
(C) Equals 1 kcal/kmol °K
(D) Equals 0.24 kcal/kmol °K

9. Compressibility factor for almost all the gases are approximately same at the same
(A) Pressure and temperature
(B) Reduced pressure and reduced temperature
(C) Critical pressure and critical temperature
(D) None of these

10. Which law of the thermodynamics provides basis for measuring the thermodynamic property?
(A) First law
(B) Zeroth law
(C) Third law
(D) Second law

11. Which of the following will increase the volume of a real gas by four times?
(A) Doubling the absolute temperature as well as pressure of the gas
(B) Reducing pressure to one fourth at constant temperature
(C) Reducing temperature to one fourth at constant pressure
(D) Reducing the temperature to half and doubling the pressure

12. Gibbs phase rule finds application, when heat transfer occurs by
(A) Conduction
(B) Convection
(D) Condensation

13. Second law of thermodynamics is concerned with the
(A) Amount of energy transferred
(B) Direction of energy transfer
(C) Irreversible processes only
(D) Non-cyclic processes only

14. In jet refrigerators, the refrigerating fluid is practically always
(A) Water
(B) Ammonia
(C) Freon
(D) Brine

15. In case of the decomposition of hydroiodic acid (2HI  H2 + I2), addition of H2 (at equilibrium condition) will
(A) Increase the partial pressure of I2
(B) Decrease the partial pressure of HI
(C) Diminish the degree of dissociation of HI
(D) None of these

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