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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
In gas turbines, high thermal efficiency is obtained in

Closed cycle
Closed/open depending on other considerations
Open cycle
Closed cycle & Open cycle

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Compressors, Gas Turbines and Jet Engines
The blades of gas turbine are made of

Stainless steel
High nickel alloy
High alloy steel
Carbon steel

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Compressors, Gas Turbines and Jet Engines
Reheating in multistage expansion gas turbine results in

Reduction in compressor work
Decrease of heat loss in exhaust
Maximum work output
High thermal efficiency

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Compressors, Gas Turbines and Jet Engines
For maximum work, the reheating should be done to an intermediate pressure of (Where p₁ = Maximum pressure, and p₂ = Minimum pressure)

p₁ p₂
(p₁ + p₂)/2
p₁/p₂
(p₁ - p₂)/2

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Compressors, Gas Turbines and Jet Engines
For supplying intermittent small quantity of air at high pressure, following compressor is best suited

Screw
Centrifugal
Axial
Reciprocating

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Compressors, Gas Turbines and Jet Engines
Atmospheric pressure is 1.03 kg/cm and vapour pressure is 0.03 kg/cm. The air pressure will be

0.53 kg/cm²
1.03 kg/cm²
1.06 kg/cm²
1.00 kg/cm²

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