Chemical Engineering Thermodynamics MCQ Exam Questions - Set 32 - ObjectiveBooks
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Chemical Engineering Thermodynamics MCQ Exam Questions - Set 32

Practice Test: Question Set - 32


1. Free energy change at equilibrium is
    (A) Zero
    (B) Positive
    (C) Negative
    (D) Indeterminate

2. First law of thermodynamics is mathematically stated as
    (A) dQ = dE + dW
    (B) dQ = dE - dW
    (C) dE = dQ + dW
    (D) dW = dQ + dE

3. __________ decreases during adiabatic throttling of a perfect gas.
    (A) Entropy
    (B) Temperature
    (C) Enthalpy
    (D) Pressure

4. Entropy change of mixing two liquid substances depends upon the
    (A) Molar concentration
    (B) Quantity (i.e. number of moles)
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

5. The first law of thermodynamics is a restatement of the law of conservation of
    (A) Mass
    (B) Energy
    (C) Momentum
    (D) None of these

6. Gibbs-Duhem equation
    (A) States that n1dμ1 + n2dμ2 + ....njdμj = 0, for a system of definite composition at constant temperature and pressure
    (B) Applies only to binary systems
    (C) Finds no application in gas-liquid equilibria involved in distillation
    (D) None of these

7. A liquid under pressure greater than its vapor pressure for the temperature involved is called a __________ liquid.
    (A) Sub-cooled
    (B) Saturated
    (C) Non-solidifiable
    (D) None of these

8. Number of degrees of freedom for a three phase system in equilibrium comprising of three non-reacting chemical species is
    (A) 2
    (B) 0
    (C) 1
    (D) 3

9. The unit of equilibrium constant of a chemical reaction is the same as that of
    (A) Molar concentration
    (B) Temperature
    (C) Internal energy
    (D) None of these

10. What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T1 and T2 are source & surrounding temperatures respectively.)?
    (A) TR/(T2 - TR) × (T1 - T2)/T1
    (B) TR/(T2 - TR) × T1/(T1 - T2)
    (C) TR/(T1 - TR) × (T1 - T2)/T1
    (D) None of these

11. The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is
    (A) R loge 4
    (B) R log10 4
    (C) Cv log10 4
    (D) Cv loge 4

12. Throttling (Joule-Thomson effect) process is a constant __________ process.
    (A) Enthalpy
    (B) Entropy
    (C) Pressure
    (D) None of these

13. (∂H/∂T)P is the mathematical expression for
    (A) CV
    (B) Entropy change
    (C) Gibbs free energy
    (D) None of these

14. The equation Tds = dE - PdV applies to
    (A) Single phase fluid of varying composition
    (B) Single phase fluid of constant composition
    (C) Open as well as closed systems
    (D) Both (b) and (c)

15. With increase in temperature, the internal energy of a substance
    (A) Increases
    (B) Decreases
    (C) Remains unchanged
    (D) May increase or decrease; depends on the substance

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