Compressors, Gas Turbines and Jet Engines
Which of the following statement is correct as regard to centrifugal compressors?

The impeller rotates at high speeds
The maximum efficiency is higher than multistage axial flow compressors
The static pressure of air in the impeller increases in order to provide centripetal force on the air
The flow of air is parallel to the axis of the compressor

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP

Compressors, Gas Turbines and Jet Engines
Choose the correct statement

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

ANSWER DOWNLOAD EXAMIANS APP