Compressors, Gas Turbines and Jet Engines
In jet propulsion power unit, the inlet duct of diverging shape is used in order to

Collect more air
Beautify the shape
Provide robust structure
Convert kinetic energy of air into pressure energy

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Compressors, Gas Turbines and Jet Engines
Clearance volume in actual reciprocating compressors is essential

To accommodate Valves in the cylinder head
To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head
To provide cushioning effect
To attain high volumetric efficiency

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

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

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

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Compressors, Gas Turbines and Jet Engines
Water gas is produced by

Carbonisation of coal
Passing steam over incandescent coke
Passing air and a large amount of steam over waste coal at about 65°C
Partial combustion of coal, eke, anthracite coal or charcoal in a mixed air steam blast

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