A. Free expansion of a gas
B. Compression of air in a compressor
C. Expansion of steam in a turbine
D. All (A), B. & (C)
Related Mcqs:
- 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 - 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 - 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 - 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 - 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 - 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 - During a reversible isothermal expansion of an ideal gas, the entropy change is_________________?
A. +ve
B. 0
C. -ve
D. ∞ - During a reversible isothermal expansion of an ideal gas, the entropy change is___________________?
A. +ve
B. 0
C. -ve
D. ∞ - 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 - The internal energy of an ideal gas does not change in a reversible _____________ process?
A. Isothermal
B. Adiabatic
C. Isobaric
D. Isometric
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