Compressors, Gas Turbines and Jet Engines The efficiency of roots blower ________ with the increase in pressure ratio. None of these Does not change Decreases Increases None of these Does not change Decreases Increases ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines The axial flow compressor is preferred in aircraft gas turbines because of None of the listed here Low frontal area Higher thrust High pressure rise None of the listed here Low frontal area Higher thrust High pressure rise ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines The efficiency of the vane blower is (where W₁ = Workdone due to compression, and W₂ = Workdone due to back flow) W₁/(W₁ + W₂) W₂/(W₁ + W₂) (W₁ + W₂)/W₂ (W₁ + W₂)/W₁ W₁/(W₁ + W₂) W₂/(W₁ + W₂) (W₁ + W₂)/W₂ (W₁ + W₂)/W₁ ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines The pressure ratio of an ideal vaned compressor with increase in mass flow rate Increases Decreases Remain constant First decreases and then increases Increases Decreases Remain constant First decreases and then increases ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would None of these Increase Remain same Decrease None of these Increase Remain same Decrease ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines The ratio of the discharge pressure to the inlet pressure of air is called Compression ratio Expansion ratio Volumetric efficiency Compressor efficiency Compression ratio Expansion ratio Volumetric efficiency Compressor efficiency ANSWER DOWNLOAD EXAMIANS APP
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