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.
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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