Compressors, Gas Turbines and Jet Engines
In a jet propulsion

None of these
The propulsive matter is caused to flow around the propelled body
Its functioning does not depend upon presence of air
The propulsive matter is ejected from within the propelled body

ANSWER DOWNLOAD EXAMIANS APP

Compressors, Gas Turbines and Jet Engines
For a two stage reciprocating compressor, compression from p₁ to p₃ is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is pa, then the intermediate pressure p₂ is given by

p₂ = p₁. p₃
P₂ = Pa × p₃/p₁
p₂ = (p₁ + p₃)/2
p₂ = Pa p₃/p₁

ANSWER DOWNLOAD EXAMIANS APP

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

First increase, reach maximum and then decrease
Increase first at slow rate and then fast
Decrease continuously
Increase first at fast rate and then slow

ANSWER DOWNLOAD EXAMIANS APP