Compressors, Gas Turbines and Jet Engines In jet engines, paraffin is usually used as the fuel because of its Ease of atomisation Both (A) and (C) above Low freezing point High calorific value Ease of atomisation Both (A) and (C) above Low freezing point High calorific value ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio Decreases First increases and then decreases First decreases and then increases Increases Decreases First increases and then decreases First decreases and then increases Increases ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines High air-fuel ratio in gas turbines Reduces exhaust temperature Do not damage turbine blades Improves thermal efficiency Increases power output Reduces exhaust temperature Do not damage turbine blades Improves thermal efficiency Increases power output 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 = p₂/p₁ D₁/D₂ = p₁ p₂ None of these D₁/D₂ = p₁/p₂ D₁/D₂ = p₂/p₁ D₁/D₂ = p₁ p₂ ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines Diffuser in a compressor is used to Convert pressure energy into kinetic energy Increase velocity Convert kinetic energy into pressure energy Make the flow streamline Convert pressure energy into kinetic energy Increase velocity Convert kinetic energy into pressure energy Make the flow streamline ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines The ratio of work-done per cycle to the stroke volume of the compressor is known as Compressor efficiency Mean effective pressure Compressor capacity Compression ratio Compressor efficiency Mean effective pressure Compressor capacity Compression ratio ANSWER DOWNLOAD EXAMIANS APP
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