COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

Convert pressure energy into kinetic energy

Increase velocity

Make the flow streamline

Convert kinetic energy into pressure energy

In the diffuser and impeller

In the inlet guide vanes only

In the impeller only

In the diffuser only

Exhaust losses in gas turbine are high due to large mass flow rate

Overall efficiency of gas turbine plant is lower than that of a reciprocating engine

Gas turbine does not require huge quantity of water like steam plant

Gas turbine is a self starting unit

None of these

Product of shaft output of air motor and shaft input to the compressor

Ratio of shaft output of the air motor to the shaft input to the compressor

Ratio of shaft input to the compressor to the shaft output of air motor

Gas turbines have high standby losses and require lot of maintenance

Gas turbine is capable of rapid start up and loading

Gas turbines has flat efficiency at part loads

Gas turbine requires lot of cooling water

0.5

0.3

0.4

0.2

Does not change

First decrease and then increase

Increases

Decreases

(v₁ - v₂)²/2g

(v₁² -v₂²)/2g

(v₁² -v₂²)/g

(v₁ - v₂)²/g

To minimize the work of compression

To cool the air at delivery

To cool the air during compression

To enable compression in two stages

Decreases

Remains same

Increases/decreases depending on compressor capacity

Increases