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)`

Report

Discuss

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`

Report

Discuss

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`

Report

Discuss

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)`

Report

Discuss

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)`

Report

Discuss