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

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Compressors, Gas Turbines and Jet Engines
An ideal air compressor cycle with clearance on P-V diagram can be represented by following processes

Two adiabatic and two isobaric
Two adiabatic, one isobaric and one constant volume
One adiabatic, one isobaric and two constant volumes
One adiabatic, two isobaric, and one constant volume

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Compressors, Gas Turbines and Jet Engines
In a jet propulsion

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

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Compressors, Gas Turbines and Jet Engines
The compressor capacity is defined as the

Volume of air delivered by the compressor
Volume of air sucked by the compressor during its suction stroke
Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
None of these

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