COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

For slow speed large capacity compressor, following type of valve will be best suited

Mechanical valve of the Corliss, sleeve, rotary or semi rotary type

Any of the above

Poppet valve

Disc or feather type

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Maximum temperature in a gas turbine is of the order of

2000°C

700°C

1000°C

1500°C

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

Less

More

Zero

Same

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The working fluid in a turbine is

In two phases

In three phases

In the form of air and water mixture

In a single phase

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The mass of gas turbine per kW developed is about ________ as that of an I.C. engine.

One sixth

One fourth

Same

One-half

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Inter-cooling in gas turbine results in

Increase in both thermal efficiency and net output

Increase in thermal efficiency but decrease in net output

Increase in net output but decrease in thermal efficiency

Decrease in both thermal efficiency and net output

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Mechanical efficiency of gas turbines as compared to I.C engines is

Lower

Same

Higher

None of these

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In a closed cycle gas turbine, the air is compressed

Isentropically

None of these

Polytropically

Isothermally

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Air-fuel ratio in a jet engine will be of the order of

0.62569444444444

0.41736111111111

2.5006944444444

0.83402777777778

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A compressor mostly used for supercharging of I.C. engines is

Roots blower

Axial flow compressor

Radial flow compressor

Reciprocating compressor

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