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  • Question
  • The accentric factor of a materical, '?', is defined as ? = -log10(Prsat)Tr-1 = 0.7, where, Prsat = reduced vapor pressure, Tr = reduced temperature. The value of accentric factor is always


  • Options
  • A. > 2
  • B. < 1
  • C. > 1
  • D. < 3

  • Correct Answer
  • < 1 


  • Chemical Engineering Thermodynamics problems


    Search Results


    • 1. A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?

    • Options
    • A. Vapor compression cycle using expansion valve.
    • B. Air refrigeration cycle.
    • C. Vapor compression cycle using expansion engine.
    • D. Carnot refrigeration cycle.
    • Discuss
    • 2. Pick out the correct statement:

    • Options
    • A. In an isothermal system, irreversible work is more than reversible work.
    • B. Under reversible conditions, the adiabatic work is less than isothermal work.
    • C. Heat, work, enthalpy and entropy are all 'state functions'.
    • D. Matter and energy can not be exchanged with the surroundings in a closed system.
    • Discuss
    • 3. Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5 ⇌ PCl3 + Cl2.Degree of dissociation of PCl5 will

    • Options
    • A. decrease on addition of Cl2.
    • B. increase on addition of an inert gas at constant pressure.
    • C. decrease on increasing the pressure of the system.
    • D. none of these
    • Discuss
    • 4. For a spontaneous process, free energy

    • Options
    • A. is zero
    • B. increases
    • C. decreases whereas the entropy increases
    • D. and entropy both decrease
    • Discuss
    • 5. Boyle's law for gases states that

    • Options
    • A. , when temperature is constant.
    • B. , when temperature & mass of the gas remain constant.
    • C. P ? V, at constant temperature & mass of the gas.
    • D. = constant, for any gas.
    • Discuss
    • 6. Entropy is a measure of the __________ of a system.

    • Options
    • A. disorder
    • B. orderly behaviour
    • C. temperature changes only
    • D. none of these
    • Discuss
    • 7. Water on heating from 1 to 4°C

    • Options
    • A. contracts
    • B. expands
    • C. has same volume
    • D. may contract or expand
    • Discuss
    • 8. Fundamental principle of refrigeration is based on the __________ law of thermodynamics.

    • Options
    • A. zeroth
    • B. first
    • C. second
    • D. third
    • Discuss
    • 9. __________ increases with increase in pressure.

    • Options
    • A. The melting point of wax
    • B. The boiling point of a liquid
    • C. both (a) and (b)
    • D. neither (a) nor (b)
    • Discuss
    • 10. The freezing point of a liquid decreases when the pressure is increased, if the liquid __________ while freezing.

    • Options
    • A. contracts
    • B. expands
    • C. does not change in volume
    • D. either (a), (b) or (c)
    • Discuss


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