A. System and surroundings pressure be equal
B. Friction in the system should be absent
C. System and surroundings temperature be equal
D. None of these
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 - 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) - Which of the following is not a reversible process ?
A. Expansion of an ideal gas against constant pressure
B. Atmospheric pressure vaporisation of water at 100°C
C. Solution of NaCl in water at 50°C
D. None of these - In the equation, PVn = constant, if the value of n is in between 1 and y (i.e. Cp/Cv), then it represents a reversible ____________ process?
A. Isometric
B. Polytropic
C. Isentropic
D. Isobaric - In the equation PVn = constant, if the value of n = y = Cp/Cv, then it represents a reversible ______________ process?
A. Isothermal
B. Adiabatic
C. Isentropic
D. Polytropic - In the equation, PVn = constant, if the value of n = ± ∞, then it represents a reversible _____________ process?
A. Adiabatic
B. Isometric
C. Isentropic
D. Isothermal - What happens in a reversible adiabatic expansion process ?
A. Heating takes place
B. Cooling takes place
C. Pressure is constant
D. Temperature is constant - Which of the following is not correct for a reversible adiabatic process ?
A. TVγ-1 = constant
B. p1-γ.TY = constant
C. PVγ = constant
D. None of these
