Compressors & Turbines & Jet Engines Mcqs

This set of Mechanical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Compressors & Turbines & Jet Engines ”. These questions are chosen from a collection of most authoritative and best reference books on Mechanical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Compressors & Turbines & Jet Engines comprehensively.

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1.
The compressor capacity with decrease in suction temperature_________________?

Increases

Decreases

Remains unaffected

May increase or decrease depending on compressor capacity

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2.
Inter cooling in compressors__________________?

Cools the delivered air

Results in saving of power in compressing a given volume to given pressure

Is the standard practice for big compressors

Enables compression in two stages

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3.
Isothermal compression though most efficient, but is not -practicable because_________________?

Ityrequires very big cylinder

It does not increase pressure much

It is impossible in practice

Compressor has to run at very slow speed to achieve it

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4.
What will be the volume of air at 327°C if its volume at 27°C is 1.5 m3/mt ?

3 m3/mt

1.5 m3/mt

18 m3/mt

6 m3/mt

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5.
An ideal air compressor cycle without clearance on p-v diagram can be represented by following processes________________?

One adiabatic, two isobaric, and one constant volume

Two adiabatic and two isobaric

Two adiabatic, one isobaric and one constant volume

One adiabatic, one isobaric and two constant volume

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6.
The work done per unit mass of air in compression will’be least when n is equal to______________?

1

1.2 ,

1.3

1.4

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7.
An ideal air compressor cycle with clearance on p-v diagram can be represented by following processes_______________?

One adiabatic, two isobaric, and one constant volume

Two adiabatic and two isobaric

Two adiabatic, one isobaric and one constant volume,

One adiabatic, one isobaric and two constant volume

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8.
Compression efficiency is compared against_____________________?

Ideal compression

Adiabatic compression

Botii isothermal and adiabatic compression

Isentropic compression

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9.
Aeroplanes employ following type of compressor_______________?

Radial flow

Axial flow

Centrifugal

Combination of above

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10.
Ratio of indicated H.P. and brake H.P. is known as_________________?

Mechanical efficiency

Volumetric efficiency

Isothermal efficiency

Adiabatic efficiency

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11.
Cylinder clearance in a compressor should be _________________?

As large as possible

As small as possible

About 50% of swept volume

About 100% of swept volume

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12.
Volumetric efficiency of air compressors is of the order of________________?

20-30%

40-50%

60-70%

70-90%

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13.
Volumetric efficiency of a compressor without clearance volume________________?

Increases with increase in compression ratio

Decreases with increase in compression ratio

Is not dependent upon compressin ratio

May increase/decrease depending on compressor capacity

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14.
Volumetric efficiency is_____________________?

The ratio of stroke volume to clearance volume

The ratio of the air actually delivered to the amount of piston displacement

Reciprocal of compression ratio

Index of compressor performance

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15.
Ratio of compression is the ratio of__________________?

Gauge discharge pressure to the gauge intake pressure

Absolute discharge pressure to the ab-solute intake pressure

Pressures at discharge and suction cor-responding to same temperature

Stroke volume and clearance volume

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