1. The volume of air delivered by the compressor is called
(A) Swept volume
(B) Compressor capacity
(C) Free air delivery
(D) All of these
2. Maximum pressure delivered by reciprocating air compressor
(A) 600 bar
(B) 700 bar
(C) 800 bar
(D) 1000 bar
3. The maximum free air discharge of rotary air compressor is as high as
(A) 3 m³/min
(B) 30 m³/min
(C) 3000 m³/min
(D) 300 m³/min
4. The maximum free air discharge of reciprocating air compressor is as high as
(A) 3000 m³/min
(B) 300 m³/min
(C) 30 m³/min
(D) 3 m³/min
5. The maximum delivery pressure in a rotary air compressor
(A) 10 bar
(B) 20 bar
(C) 30 bar
(D) 40 bar
6. The volume of air sucked by the compressor during its suction stroke is called
(A) Free air delivery
(B) Compressor capacity
(C) None of these
(D) Swept volume
7. When air is admitted to one side of the piston, the compressor is said to be
(A) Single stage
(B) Multi-stage
(C) Double acting
(D) Single acting
8. ………………Compressor gives more pressure
(A) Reciprocating
(B) Rotary
(C) Both a and b
(D) None of these
9. Cooling process of air between two stages of a compressor is called
(A) After cooling
(B) Under cooling
(C) Inter cooling
(D) All of these
10. The function of intercooler is to reduce the
(A) Temperature of air
(B) Density of air
(C) Mass of air
(D) Pressure of air
11. The inter cooling in multi-stage compression 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 minimize the work of compression
12. Multi-stage compression
(A) Reduces the work done per kg of air
(B) Improves the volumetric efficiency
(C) Reduces the cost of compressor
(D) All of these
13. The actual volume delivered by a compressor when reduced to the normal temperature and pressure condition is called
(A) Swept volume
(B) Free air delivery
(C) Compressor capacity
(D) Clearance volume
14. When the temperature of air leaving intercooler is equal to the original atmospheric temperature of air, the intercooling is called
(A) Incomplete intercooling
(B) Both a and b
(C) Complete intercooling
(D) None of these
15. For maximum volumetric efficiency of an air compressor, the clearance volume is kept
(A) Half of stroke volume
(B) Maximum
(C) Equal to swept volume
(D) Minimum
16. Isothermal efficiency of a compressor is also known as
(A) Mechanical efficiency
(B) Compressor efficiency
(C) Adiabatic efficiency
(D) Volumetric efficiency
17. A compressor which compresses air in both ends of the cylinder is known as
(A) Single stage
(B) Multi-stage
(C) Double acting
(D) Single acting
18. A compressor which compresses air in more than one or two cylinders is known as
(A) Single stage
(B) Double acting
(C) Single acting
(D) Multi-stage
19. ………………Compressors are suitable for supplying less volume of air at high pressure
(A) Reciprocating
(B) Rotary
(C) Single acting
(D) Double acting
20. Multi-stage compression is done to increase the -------------- of air in air compressor.
(A) Pressure
(B) Temperature
(C) Both a and b
(D) None of these