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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16.
The ratio of work doen per cycle to the swept volume in case of compressor is called ______________?

Compression index

Compression ratio

Compressor efficiency

Mean effective pressure

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17.
The net work input required for compressor with increase in clearance volume_____________________?

Increases

Decreases

Remains same

Increases/decreases depending on com-pressor capacity

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18.
Clearance volume in actual reciprocating compressors is essential __________________?

To accommedate Valves in the cylinder head

To provide cushioning effect

To attain high volumetric efficiency

To avoid mechanical bang of piston with cylinder head

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19.
Volumetric efficiency of a compressor with clearance volume ________________?

Increases with increase in compression ratio

Decreases with increase in compression ratio

In not dependent upon compression ratio

May increase/decrease depending on compressor capacity

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20.
Out of the following, from where you will prefer to take intake for air compressor_________________?

From an air conditioned room maintained at 20°C

From outside atmosphere at 1°C

From coal yard side

From a side where cooling tower is located nearby

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21.
Which is false statement about multistage compression ?

Power consumption per unit of air delivered is low

Volumetric efficiency is high

It is best suited for compression ratios around 7:1

The moisture in air is condensed in the intercooler

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22.
Euler’s equation is applicable for__________________?

Centrifugal compressor

Axial compressor

Pumps

All of the above

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23.
Ratio of indicated h.p. to shaft h.p. in known as__________________?

Compressor efficiency

Isothermal efficiency

Volumetric efficiency

Mechanical efficiency

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24.
The clearance volume of the air compressor is kept minimum because____________________?

It allows maximum compression to be achieved

It greatly affects volumetric efficiency

It results in minimum work

It permits isothermal compression

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25.
Which is false statement about air receivers ___________________?

These are used to dampen pulsations ,

These act as reservoir to- take care of sudden demands

These increase compressor efficiency

These knock out some oil and moisture

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26.
Rotary compressor is best suited for_____________________?

Large quantity of air at high pressure

Small quantity of air at high pressure

Small quantity of air at low pressure

Large quantity of air at low pressure

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27.
After-cooler is used to__________________?

Cool the air

Decrease the delivery temperature for ease in handling

Cause moisture and oil vapour to drop out

Reduce volume

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28.
Reciprocating air compressor is best suited for___________________?

Large quantity of air at high pressure

Small quantity of air at high pressure

Small quantity of air at low pressure

Large quantity of air at low pressure

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29.
The capacity of compressor will be highest when its intake temperature is___________________?

Lowest

Highest

Anything.

Atmospheric

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30.
In multistage compressor, the isothermal compression is achieved by_________________?

Employing intercooler

By constantly cooling the cylinder

By running compressor at very slow speed

By insulating the cylinder

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