Compressors,Gas Dynamies and Gas Turbines

1
The efficiency of the vane blower is (where W1 = Workdone due to compression, and W2 = Workdone due to back flow)
A. `(W_1)/(W_1 + W_2)`
B. `(W_2)/(W_1 + W_2)`
C. `(W_1 + W_2)/(W_1)`
D. `(W_1 + W_2)/(W_2)`

2

For perfect intercooling in a two stage compressor,

A. `P_2/P_1 = P_3/P_2`
B. `P_1/P_3 = P_2/P_1`
C. `P_1 = P_3`
D. `P_1 = P_2 P_3`

3

In n1 and n2 are the indices of compression for the first and second stage of compression, then the ratio of workdone on the first and second stages (W1/W2) with perfect intercoooing is given by

A. `W_1/W_2 = (n_2(n_1 - 1))/(n_1(n_2 - 1))`
B. `W_1/W_2 = (n_1(n_2 - 1))/(n_2(n_1 - 1))`
C. `W_1/W_2 = n_1/n_2`
D. `W_1/W_2 = n_2/n_1`

4
The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)


A. `r^(Y-1)`
B. `1 - r^(Y-1)`
C. `1 - (1/r)^(Y - 1//Y)`
D. `1 - (1/r)^(Y//Y - 1)`

5
If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by
A. `1 - K + K (P_1/P_2)^(1//n)`
B. `1+ K - K (P_2/P_1)^(1//n)`
C. `1 - K + K (P_1/P_2)^(n - 1//n)`
D. `1 + K - K (P_2/P_1)^(n - 1//n)`