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

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Compressors, Gas Turbines and Jet Engines
Choose the correct statement

Gas turbine is capable of rapid start up and loading
Gas turbines has flat efficiency at part loads
Gas turbines have high standby losses and require lot of maintenance
Gas turbine requires lot of cooling water

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Compressors, Gas Turbines and Jet Engines
Inter-cooling in gas turbine results in

Increase in thermal efficiency but decrease in net output
Increase in net output but decrease in thermal efficiency
Decrease in both thermal efficiency and net output
Increase in both thermal efficiency and net output

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Compressors, Gas Turbines and Jet Engines
In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in

Exit nozzle, which is a constant volume process
Exit nozzle, which is essentially an isentropic process
Turbine blades, which is a constant volume process
Turbine blades, which is essentially an isentropic process

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