COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

In a closed cycle gas turbine, the air is compressed

Isentropically

Polytropically

Isothermally

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of

0.9

0.85

0.75

0.99

TRUE ANSWER : ?
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The velocity of air entering in a rocket is ___ as compared to an aircraft.

Same

More

Zero

Less

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The material commonly used for air craft gas turbine is

High alloy steel

Stainless steel

Timken, Haste alloys

Duralumin

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The pressure ratio in gas turbines is of the order of

0.084027777777778

0.37569444444444

2.5423611111111

0.16736111111111

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In open cycle turbojet engines used in military aircraft, reheating the exhaust gas from the turbine by burning, more fuel is used to increase the

Thrust and range of aircraft

None of these

Efficiency of the engine

Both (A) and (B)

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The maximum combustion pressure in gas turbine as compared to I.C. engine is

Less

Same

Depends on other factors

More

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Which of the following fuels can be used in turbojet engines?

Kerosene

High speed diesel oil

Methyl alcohol

Liquid hydrogen

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For an irreversible gas turbine cycle, the efficiency and work ratio both depend on

Minimum cycle temperature alone

Both pressure ratio and maximum cycle temperature

Maximum cycle temperature alone

Pressure ratio alone

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Separators in compressor installations are located

Before inter-cooler

After inter-cooler

After receiver

Between after-cooler and air receiver

TRUE ANSWER : ?
YOUR ANSWER : ?

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