Basic Mechanical Engineering (3110006) MCQs

MCQs of Air Compressors

Showing 1 to 10 out of 30 Questions
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1.
A machine used to raise the pressure of air is called
(a) gas turbine
(b) internal combustion engine
(c) compressor
(d) air motor
Answer:

Option (c)

2.
The compressed air may be used
(a) in gas turbine plants
(b) for operating pneumatic drills
(c) in starting and supercharging of I.C. engines
(d) all of the above
Answer:

Option (d)

3.
The absolute pressure of air at the outlet of a compressor is called
(a) back pressure
(b) critical pressure
(c) discharge pressure
(d) none of these
Answer:

Option (c)

4.
The ratio of the discharge pressure to the inlet pressure of air is called
(a) compression ratio
(b) expansion ratio
(c) compressor efficiency
(d) volumetric efficiency
Answer:

Option (a)

5.
The compression ratio for the compressor is always __________ unity.
(a) equal to
(b) less than
(c) more than
(d) all of the above
Answer:

Option (c)

6.
In air compressors, free air delivery means
(a) the actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
(b) the volume of air delivered by the compressor
(c) the volume of air sucked by the compressor during its suction stroke
(d) none of the above
Answer:

Option (a)

7.
The volume of air delivered by the compressor is called
(a) free air delivery
(b) compressor capacity
(c) swept volume
(d) none of these
Answer:

Option (b)

8.
Compressor capacity is having the unit
(a) cubic meter per kg
(b) cubic meter per minute
(c) kg per cubic meter
(d) meter square per second
Answer:

Option (b)

9.
The compressor generally used in aircraft is
(a) axial flow
(b) centrifugal
(c) reciprocating
(d) roots blower
Answer:

Option (a)

10.
At high altitude, the compressor will draw
(a) more power
(b) same power
(c) less power
(d) none of these
Answer:

Option (a)

Showing 1 to 10 out of 30 Questions
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