Compressors, Gas Turbines and Jet Engines The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turbine and fixed higher and lower temperature) with increase in pressure ratio will Increase first at slow rate and then fast First increase, reach maximum and then decrease Decrease continuously Increase first at fast rate and then slow Increase first at slow rate and then fast First increase, reach maximum and then decrease Decrease continuously Increase first at fast rate and then slow ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines Inter-cooling in multistage compressors is done To cool the air during compression To enable compression in two stages To minimize the work of compression To cool the air at delivery To cool the air during compression To enable compression in two stages To minimize the work of compression To cool the air at delivery ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines The overall isothermal efficiency of compressor is defined as the ratio of Isothermal h.p. to adiabatic h.p. Work to compress air isothermally to work for actual compression Power to drive compressor to isothermal h.p. Isothermal h.p. to the BHP of motor Isothermal h.p. to adiabatic h.p. Work to compress air isothermally to work for actual compression Power to drive compressor to isothermal h.p. Isothermal h.p. to the BHP of motor ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines Actual compression curve is In between isothermal and adiabatic Same as adiabatic Better than isothermal and adiabatic Same as isothermal In between isothermal and adiabatic Same as adiabatic Better than isothermal and adiabatic Same as isothermal ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines For maximum work, the reheating should be done to an intermediate pressure of (Where p₁ = Maximum pressure, and p₂ = Minimum pressure) (p₁ - p₂)/2 p₁ p₂ p₁/p₂ (p₁ + p₂)/2 (p₁ - p₂)/2 p₁ p₂ p₁/p₂ (p₁ + p₂)/2 ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines With the decrease in compression ratio, the volumetric efficiency Decreases Does not change Increases First decrease and then increase Decreases Does not change Increases First decrease and then increase ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS