The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)
A. `r^(Y - 1)`
B. `1 -r^(Y - 1)`
C. `1 - (1/r)^(Y//Y - 1)`
D. `1 - (1/r)^(Y - 1//Y)`


Workdone during adiabatic expansion is given by (where p1 v1, T1 = Pressure, volume and temperature for the initial condition of gas, p2, v2, T2 = Corresponding values for the final condition of gas, R = Gas constant, and γ = Ratio of specific heats)

A. `(P_1V_1 - P_2 V_2)/(Y - 1)`
B. `(mR(T_1 - T_2))/(Y - 1)`
C. `(mRT_1)/(Y - 1) (1 - (P_2V_2)/(P_1V_1))`
D. all of these


The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected)

A. `delta`Q = T.ds
B. `delta`Q = T/ds
C. dQ = ds/
D. none of these

The root mean square velocity of the gas molecules is given by (where k = Boltzmann's constant, T = Absolute temperature, and m = Mass of one molecule of a gas)
A. `sqrt((kT)/(m))`
B. `sqrt((2kT)/(m))`
C. `sqrt((3kT)/(m))`
D. `sqrt((5kT)/(m))`

The expansion ratio (r) is the ratio of (where v1 = Volume at the beginning of expansion, and v2 = Volume at the end of expansion)
A. `V_1/V_2`
B. `V_2/V_1`
C. `(V_1 + V_2)/(V_1)`
D. `(V_1 + V_2)/(V_2)`