A. Only ΔE = 0
B. Only ΔH =0
C. ΔE = ΔH = 0
D. dQ = dE
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 - 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 - The work done in isothermal compression compared to that in adiabatic compression will be__________________?
A. Less
B. More
C. Same
D. More or less depending upon the extent of work done - 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 - Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is___________________?
A. 300 × (32/7)
B. 300 × (33/5)
C. 300 × (333/7)
D. 300 × (35/7) - 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 - 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