Which of the following processes cannot be made reversible even under ideal condition of operation ?

Related Mcqs:

1. On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)s and the slope of the reversible isothermal line (∂P/∂V)T are related as (where, y = Cp/Cv) ?

   A. (∂P/∂V)S = (∂P/∂V)T
   B. (∂P/∂V)S = [(∂P/∂V)T]Y
   C. (∂P/∂V)S = y(∂P/∂V)T
   D. (∂P/∂V)S = 1/y(∂P/∂V)T

2. 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) ?

   A. Δ S1 is always Δ SR
   C. Δ S1 is always > Δ SR
   D. Δ S1 is always = Δ SR

3. The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible _____________ process?

   A. Isobaric
   B. Isothermal
   C. Adiabatic
   D. None of these

4. The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition?

   A. Internal energy
   B. Enthalpy
   C. Gibbs free energy
   D. Helmholtz free energy

5. Which of the following non-flow reversible compression processes require maximum work ?

   A. Adiabatic process
   B. Isothermal process
   C. Isobaric process
   D. All require same work

6. Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition that the molar volume of liquid is negligible compared to that of the vapor ?

   A. d ln p/dt = Hvap/RT2
   B. d ln p/dt = RT2/Hvap
   C. dp/dt = RT2/Hvap
   D. dp/dt = Hvap/RT2

7. During a reversible isothermal expansion of an ideal gas, the entropy change is_________________?

   A. +ve
   B. 0
   C. -ve
   D. ∞

8. During a reversible isothermal expansion of an ideal gas, the entropy change is___________________?

   A. +ve
   B. 0
   C. -ve
   D. ∞

9. 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

10. The internal energy of an ideal gas does not change in a reversible _____________ process?

    A. Isothermal
    B. Adiabatic
    C. Isobaric
    D. Isometric