Compressors, Gas Turbines and Jet Engines During peak load periods, the best method of controlling compressors is Variable speed Relief valve Constant speed unloader Start-stop motor Variable speed Relief valve Constant speed unloader Start-stop motor ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines Mechanical efficiency of gas turbines as compared to I.C engines is None of these Same Higher Lower None of these Same Higher Lower ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is Low/high depending on make and type High Low Same Low/high depending on make and type High Low Same ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines Gas turbine cycle with regenerator Allows high compression ratio Increases thermal efficiency Allows operation at very high altitudes Decreases heat loss is exhaust Allows high compression ratio Increases thermal efficiency Allows operation at very high altitudes Decreases heat loss is exhaust ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines The ratio of isentropic work to Euler’s work is known as Euler Pressure coefficient Isentropic efficiency Compressor efficiency Euler Pressure coefficient Isentropic efficiency Compressor efficiency ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines If p₁ is the pressure of air entering the L.P, cylinder and p₃ is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by D₁/D₂ = (p₃/p₁)1/4 D₁/D₂ = (p₁/p₃)1/4 D₁/D₂ = (p₁ p₃)1/2 D₁/D₂ = (p₁ p₃)1/4 D₁/D₂ = (p₃/p₁)1/4 D₁/D₂ = (p₁/p₃)1/4 D₁/D₂ = (p₁ p₃)1/2 D₁/D₂ = (p₁ p₃)1/4 ANSWER DOWNLOAD EXAMIANS APP
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