Thermodynamics Interview Questions for Chemical Engineering - Set 33 - ObjectiveBooks

# Practice Test: Question Set - 33

1. Heat pump
(A) Accomplishes only space heating in winter
(B) Accomplishes only space cooling in summer
(C) Accomplishes both (a) and (b)
(D) Works on Carnot cycle

2. All gases above its inversion temperature, in a throttling process will show
(A) A heating effect
(B) No change in temperature
(C) A cooling effect
(D) Either (a) or (c)

3. Pick out the wrong statement.
(A) Minimum number of degree of freedom of a system is zero
(B) Degree of freedom of a system containing a gaseous mixture of helium, carbon dioxide and hydrogen is 4
(C) For a two phase system in equilibrium made up of four non-reacting chemical species, the number of degrees of freedom is 4
(D) Enthalpy and internal energy change is zero during phase change processes like melting, vaporization and sublimation

4. If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be __________ c.c.
(A) 100
(B) 50
(C) 205
(D) 200

5. For an ideal solution, the value of activity co-efficient is
(A) 0
(B) 1
(C) < 1
(D) > 1

6. The internal energy of a gas obeying P (V - bRT (where, b is a positive constant and has a constant Cv), depends upon its
(A) Pressure
(B) Volume
(C) Temperature
(D) All (a), (b) & (c)

7. Isentropic process means a constant __________ process.
(A) Enthalpy
(B) Pressure
(C) Entropy
(D) None of these

8. Which of the following equations is obtained on combining 1st and 2nd law of thermodynamics, for a system of constant mass?
(A) dE = Tds - PdV
(B) dQ = CvdT + PdV
(C) dQ = CpdT + Vdp
(D) Tds = dE - PdV

9. Entropy is a/an
(A) State function
(B) Macroscopic property
(C) Extensive property
(D) None of these

10. In polytropic process (PVn = constant), if n = 1; it means a/an __________ process.
(B) Reversible
(C) Isothermal
(D) None of these

11. If an ideal solution is formed by mixing two pure liquids in any proportion, then the __________ of mixing is zero
(A) Enthalpy
(B) Volume
(C) Both 'a' & 'b'
(D) Neither 'a' nor 'b'

12. The difference between isothermal compressibility and adiabatic compressibility for an ideal gas is
(A) 0
(B) +ve
(C) -ve
(D)

13. The temperature at which both liquid and gas phases are identical, is called the __________ point.
(A) Critical
(B) Triple
(C) Freezing
(D) Boiling

14. Clausius-Clapeyron Equation gives accurate result, when the
(A) Vapor pressure is relatively low and the temperature does not vary over wide limits
(B) Vapor obeys the ideal gas law and the latent heat of vaporization is constant
(C) Volume in the liquid state is negligible compared with that in the vapor state
(D) All (a), (b) and (c)

15. Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will
(A) Increase
(B) Decrease
(C) Remain unchanged
(D) First fall and then rise

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