Compressors, Gas Turbines and Jet Engines Phenomenon of choking in compressor means Reducing mass flow rate with increase in pressure ratio No flow of air Fixed mass flow rate regardless of pressure ratio Increased inclination of chord with air steam Reducing mass flow rate with increase in pressure ratio No flow of air Fixed mass flow rate regardless of pressure ratio Increased inclination of chord with air steam ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines In open cycle turbojet engines used in military aircraft, reheating the exhaust gas from the turbine by burning, more fuel is used to increase the Thrust and range of aircraft Efficiency of the engine Both (A) and (B) None of these Thrust and range of aircraft Efficiency of the engine Both (A) and (B) None of these ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines The inter-cooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p₁ = Intake pressure of air, p₂ = Inter-cooler pressure, and p₃ = Delivery pressure of air) p₂ = p₁ × p₃ p₂ = p₁/p₃ p₂ = p₁ × p₂ p₂ = p₃/p₁ p₂ = p₁ × p₃ p₂ = p₁/p₃ p₂ = p₁ × p₂ p₂ = p₃/p₁ ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called Mechanical efficiency Volumetric efficiency Compressor efficiency Isothermal efficiency Mechanical efficiency Volumetric efficiency Compressor efficiency Isothermal efficiency ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines If p₁, is the pressure of air entering the L.P. cylinder and p₂ is the pressure of air leaving the L.P. cylinder (or inter-cooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocating air compressor with complete intercooling is given by (where D₁ = Dia. of L.P. cylinder, and D₂ = Dia. of H.P. cylinder) None of these D₁/D₂ = p₁ p₂ D₁/D₂ = p₁/p₂ D₁/D₂ = p₂/p₁ None of these D₁/D₂ = p₁ p₂ D₁/D₂ = p₁/p₂ D₁/D₂ = p₂/p₁ 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. Isothermal h.p. to the BHP of motor Power to drive compressor to isothermal h.p. Work to compress air isothermally to work for actual compression Isothermal h.p. to adiabatic h.p. Isothermal h.p. to the BHP of motor Power to drive compressor to isothermal h.p. Work to compress air isothermally to work for actual compression ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS