TSEE MCQ part 11

Air compressor

1. The ratio of work-done per cycle to the stroke volume of the compressor is known as.......

A.Compressor capacity

B.Compression ratio

C.Compressor efficiency

D.Mean effective pressure

Answer D.Mean effective pressure

 

2. The capacity of a compression is 10 m³/minute.10 m ³/minute refers to.......

A.Standard air

B.Free air

C.Compressed air

D.Compressed air at delivery pressure

Answer B.Free air

3. Aeroplanes having following type of compressor.........

A.Radial flow

B.Axial flow

C.Centrifugal

C.Combination of above

Answer B.Axial flow

 

5. Compression efficiency is compared against.......

A.Ideal compression

B.adiabatic compression

C.both isothermal and adiabatic compression

D.Isentropic compression

E.Isothermal compression

Answer E.Isothermal compression

 

 

6. The volume of air delivered by the compressor is called.......

A.Free air delivery

B.Compressor capacity

C.Swept volume

D.None of the above

Answer B.Compressor capacity

7. The most efficient method of compressing air is to compress it.......

A.Isothermal

B.Adiabatically

C.Isentropically

D.Isochronically

Answer A.Isothermal

8. Ratio of indicated HP and break HP is known as..........

A.Mechanical efficiency

B.Volumetric efficiency

C.Isothermal efficiency

C.Adiabatic efficiency

Answer A.Mechanical efficiency

 

9. Maximum work is done in compressing air when the compression is......

A.Improves volumetric efficiency for the given pressure ratio

B.Isothermal

C.Adiabatic

D.Polytropic

E.Any of the above

Answer B.Adiabatic

10. The value of air sucked by the compressor during its suction stroke is called.......

A.Free air delivery

B.Compressor capacity

C.Swept volume

D.none of the above

Answer C.Swept volume

 

 

11. The ratio of indicated HP to shaft HP is known as.......

A.Compressor efficiency

B.Isothermal efficiency

C.Volumetric efficiency

D.Mechanical efficiency

Answer D.Mechanical efficiency

12. Volumetric efficiency is.......

A.The ratio of stroke volume to clearance volume

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

C.Reciprocal of compression ratio

D.Index of compressor performance

Answer A

 

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

13. Volumetric efficiency of air compressors is of the order of.........

A.20 to 30%

B.40 to 50%

C.60 to 70%

C.70 to 90%

Answer D.70 to 90%

 

15. The intercooling in multistage compressors is done.....

A.To cool the air during compression

B.To cool the air at delivery

C.To enable compression in two stages

D.To minimise the work of compression

Answer D.To minimise the work of compression