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Chemical Engineering :: Chemical Engineering Thermodynamics

  1. The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is

  2. A.
    less
    B.
    more
    C.
    same
    D.
    dependent on climatic conditions

  3. The unit of fugacity is the same as that of the

  4. A.
    pressure
    B.
    temperature
    C.
    volume
    D.
    molar concentration

  5. Filling of gas from a high pressure cylinder into small bottles is an example of a/an __________ process.

  6. A.
    equilibrium
    B.
    adiabatic
    C.
    steady
    D.
    unsteady

  7. A large iceberg melts at the base, but not at the top, because of the reason that

  8. A.
    ice at the base contains impurities which lowers its melting point.
    B.
    due to the high pressure at the base, its melting point reduces.
    C.
    the iceberg remains in a warmer condition at the base.
    D.
    all (a), (b) and (c).

  9. At the critical point of a substance

  10. A.
    the surface tension vanishes.
    B.
    liquid and vapour have the same density.
    C.
    there is no distinction between liquid and vapour phases.
    D.
    all (a), (b) and (c).

  11. A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then(where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively)

  12. A.
    Δ S1 is always < Δ SR
    B.
    Δ S1 is sometimes > Δ SR
    C.
    Δ S1 is always > Δ SR
    D.
    Δ S1 is always = Δ SR

  13. A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature after each stage. The intermediate pressure for the minimum total work requirement should be equal to the __________ mean of P1 and P2.(where, P1 and P2 are initial and final pressures respectively)

  14. A.
    logarithmic
    B.
    arithmetic
    C.
    geometric
    D.
    harmonic

  15. y = specific heat ratio of an ideal gas is equal to

  16. A.
    Cp/Cv
    B.
    Cp/(CP-R)
    C.
    1 + (R/CV)
    D.
    all (a), (b) and (c)

  17. Consider the process A & B shown in the figure given below

    In this case, it is possilbe that

  18. A.
    both the processes are adiabatic.
    B.
    both the processes are isothermal.
    C.
    process A is isothermal while B is adiabatic.
    D.
    process A is adiabatic while B is isothermal.

  19. Gibbs free energy of a pure fluid approaches __________ as the pressure tends to zero at constant temperature.

  20. A.
    infinity
    B.
    minus infinity
    C.
    zero
    D.
    none of these