#### 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)