Compressors, Gas Turbines and Jet Engines
In the aircraft propellers

The propulsive matter is caused to flow around the propelled body
Propulsive matter is ejected from within the propelled body
All of these
Its functioning does not depend on presence of air

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Compressors, Gas Turbines and Jet Engines
The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the

Rotor to static enthalpy rise in the stator
Rotor to static enthalpy rise in the stage
Stator to static enthalpy rise in the stage
Stator to static enthalpy rise in the rotor

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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)

D₁/D₂ = p₁/p₂
D₁/D₂ = p₂/p₁
None of these
D₁/D₂ = p₁ p₂

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