Chemical Engineering Thermodynamics Problems and Solutions - Set 28 - ObjectiveBooks

Chemical Engineering Thermodynamics Problems and Solutions - Set 28

Practice Test: Question Set - 28

1. A/an __________ system is exemplified by a vessel containing a volatile liquid in contact with its vapor.
    (A) Isolated
    (B) Closed
    (C) Open
    (D) None of these

2. Pick out the correct statement.
    (A) If an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container, the temperature of the liquid will increase
    (B) A process is irreversible as long as Δ S for the system is greater than zero
    (C) The mechanical work done by a system is always equal to∫P.dV
    (D) The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants

3. Which of the following is a widely used refrigerant in vapor compression refrigeration system (using large centrifugal compressor)?
    (A) Freon
    (B) Liquid sulphur dioxide
    (C) Methyl chloride
    (D) Ammonia

4. Entropy change for an irreversible isolated system is
    (B) 0
    (C) < 0
    (D) > 0

5. (∂E/∂T)V is the mathematical expression for
    (A) CV
    (B) Enthalpy change
    (C) Free energy change
    (D) None of these

6. The work done in an adiabatic change in a particular gas depends upon changes in the __________ only.
    (A) Temperature
    (B) Specific heat
    (C) Volume
    (D) Pressure

7. Fugacity of a component in an ideal gas mixture is equal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at constant pressure and temperature __________ as its mole fraction increases.
    (A) Decreases
    (B) Decreases exponentially
    (C) Increases
    (D) Remain constant

8. An ideal gas is taken around the cycle ABCA as shown in P-V diagram below: The work done by the gas during the cycle is equal to
    (A) 12 P1V1
    (B) 6 P1 V1
    (C) 3 P1V1
    (D) P1 V1

9. Which of the following is not a unit of the equilibrium constant Kp? (where, Δx = number of moles of products number of moles of reactants)
    (A) (atm)Δx, when Δx is negative
    (B) (atm)Δx, when Δx is positive
    (C) Dimensionless, when Δx = 0
    (D) (atm)Δx2, when Δx > 0

10. The efficiency of a Carnot heat engine operating between absolute temperature T1 and T2 (when, T1 > T2) is given by (T1 - T2)/T1. The co-efficient of performance (C.O.P.) of a Carnot heat pump operating between T1 and T2 is given by
    (A) T1/(T1-T2)
    (B) T2/(T1-T2)
    (C) T1/T2
    (D) T2/R1

11. dW and dq are not the exact differential, because q and are
    (A) State functions
    (B) Path functions
    (C) Intensive properties
    (D) Extensive properties

12. In an irreversible process
    (A) Tds = dE - dW = 0
    (B) dE - dW - Tds = 0
    (C) Tds - dE + dW < 0
    (D) Tds - dT + dW < 0

13. The expression for entropy change given by, ΔS = - nR ln (P2/P1), holds good for
    (A) Expansion of a real gas
    (B) Reversible isothermal volume change
    (C) Heating of an ideal gas
    (D) Cooling of a real gas

14. When pressure is applied on the system, ice ↔ water, then
    (A) Equilibrium cannot be established
    (B) More ice will be formed
    (C) More water will be formed
    (D) Evaporation of water will take place

15. PVγ = Constant (where, γ = Cp/Cv) is valid for a/an __________ process.
    (A) Isothermal
    (B) Isentropic
    (C) Isobaric
    (D) Adiabatic

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