COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

Ram compression in turbojet involves

Lost work

Increasing speed of incoming air

Compression of inlet air

Reduction of speed of incoming air and conversion of part of it into pressure energy

TRUE ANSWER : ?
YOUR ANSWER : ?

Choose the correct statement

Gas turbines has flat efficiency at part loads

Gas turbine is capable of rapid start up and loading

Gas turbines have high standby losses and require lot of maintenance

Gas turbine requires lot of cooling water

TRUE ANSWER : ?
YOUR ANSWER : ?

A compressor at high altitudes will require ___ power.

More

Less

Same

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

The air is delivered ________ in one revolution in case of a three lobbed rotor.

Two times

Six times

Three times

Four times

TRUE ANSWER : ?
YOUR ANSWER : ?

Intercooling in gas turbines

Decreases net output but increases thermal efficiency

Decreases net output and thermal efficiency both

Increases net output and thermal efficiency both

Increases net output but decreases thermal efficiency

TRUE ANSWER : ?
YOUR ANSWER : ?

The efficiency of jet engine is

Lower at low speed

Higher at high speed

Same at all altitudes

Higher at high altitudes

TRUE ANSWER : ?
YOUR ANSWER : ?

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

p₂ = (p₁ + p₃)/2

P₂ = Pa × p₃/p₁

TRUE ANSWER : ?
YOUR ANSWER : ?

The air power of the compressor is also known as

Brake power

None of these

Indicated power

Frictional power

TRUE ANSWER : ?
YOUR ANSWER : ?

The closed cycle in gas turbines

In never used

Provides greater flexibility

Provides lesser flexibility

Is used when gas is to be burnt

TRUE ANSWER : ?
YOUR ANSWER : ?

The type of rotary compressor used in gas turbines, is of

Radial flow type

None of the listed here

Axial flow type

Centrifugal type

TRUE ANSWER : ?
YOUR ANSWER : ?