Chemical engineering thermodynamics basics questions - Set 10 - ObjectiveBooks

# Practice Test: Question Set - 10

1. For an exothermic reaction
(A) Only enthalpy change (ΔH) is negative
(B) Only internal energy change (ΔE) is negative
(C) Both ΔH and ΔE are negative
(D) Enthalpy change is zero

2. Which of the following is not a reversible process?
(A) Expansion of an ideal gas against constant pressure
(B) Atmospheric pressure vaporization of water at 100°C
(C) Solution of NaCl in water at 50°C
(D) None of these

3. For spontaneous changes in an isolated system (S = entropy)
(A) ds = 0
(B) ds < 0
(C) ds > 0
(D) ds = Constant

4. With increase in reduced temperature, the fugacity co-efficient of a gas at constant reduced pressure
(A) Increases
(B) Decreases
(C) Remain same
(D) Decreases linearly

5. The absolute entropy for all crystalline substances at absolute zero temperature is
(A) Zero
(B) Negative
(C) More than zero
(D) Indeterminate

6. The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for
(A) Reversible isothermal volume change
(B) Heating of a substance
(C) Cooling of a substance
(D) Simultaneous heating and expansion of an ideal gas

7. In the equation, PVn = constant, if the value of n = 1, then it represents a reversible __________ process.
(A) Isothermal
(B) Isobaric
(C) Polytropic

8. Critical temperature is defined as the temperature above which a gas will
(A) Not liquify (barring exceptions)
(B) Immediately liquify
(C) Never liquify however high the pressure may be
(D) None of these

9. The second law of thermodynamics states that
(A) The energy change of a system undergoing any reversible process is zero
(B) It is not possible to transfer heat from a lower temperature to a higher temperature
(C) The total energy of system and surrounding remains the same
(D) None of the above

10. For equilibrium process (i.e. reversible) in an isolated system
(A) ds = 0
(B) ds < 0
(C) ds > 0
(D) ds = Constant

11. A gas has a volume of 27.3 c.c. at 0°C. Its volume at 10°C (if pressure remains unchanged) will be __________ c.c.
(A) 2.73
(B) 28.3
(C) 273
(D) 283

12. First law of thermodynamics deals with the
(A) Direction of energy transfer
(B) Reversible processes only
(C) Irreversible processes only
(D) None of these

13. The energy of activation of exothermic reaction is
(A) Zero
(B) Negative
(C) Very large compared to that for endothermic reaction
(D) Not possible to predict

14. The first law of thermodynamics is a statement of conservation of
(A) Heat
(B) Momentum
(C) Energy
(D) Work

15. Which of the following is not a common refrigerant?
(A) Freon-12
(B) Ethylene
(C) Ammonia
(D) Carbon dioxide

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