Basic Mechanical Engineering (3110006) MCQs

MCQs of Air Compressors

Showing 11 to 20 out of 30 Questions
1 2 3
11.
Which one of the following is a positive displacement type compressor?
(a) Centrifugal compressor
(b) Both A and D
(c) Roots blower
(d) Axial flow compressor
Answer:

Option (c)

12.
The inlet pressure is always __________ the discharge pressure.
(a) equal to
(b) less than
(c) more than
(d) all of the above
Answer:

Option (b)

13.
The volume 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 these
Answer:

Option (c)

14.
In a single-acting reciprocating compressor, the suction, compression, and delivery of air takes place in __________ of the piston.
(a) one stroke
(b) two strokes
(c) three strokes
(d) four strokes
Answer:

Option (b)

15.
In a single-stage, single-acting reciprocating air compressor, without clearance volume, the work done is minimum during
(a) isothermal compression
(b) isentropic compression
(c) polytropic compression
(d) none of these
Answer:

Option (a)

16.
The clearance volume in a compressor is provided
(a) to increase volumetric efficiency
(b) to reduce the work input
(c) so that piston does no strike the cylinder head
(d) to accommodate valves in the cylinder
Answer:

Option (c)

17.
When air is to be compressed at high pressure, then it is advantageous to use
(a) single-stage compression
(b) multi-stage compression without intercooling
(c) multi-stage compression with intercooling
(d) none of these
Answer:

Option (c)

18.
The multi-stage compression of air as compared to single-stage compression
(a) improves volumetric efficiency for the given pressure ratio
(b) reduces work done per kg of air
(c) gives more uniform torque
(d) all of these
Answer:

Option (d)

19.
Intercooling in multi-stage compressors is done
(a) to minimize the work of compression
(b) to cool the air at delivery
(c) to enable compression in two stages
(d) to cool the air during compression
Answer:

Option (a)

20.
Rotary compressors are used for delivering
(a) small quantities of air at high pressures
(b) large quantities of air at low pressures
(c) small quantities of air at low pressures
(d) large quantities of air at high pressures
Answer:

Option (b)

Showing 11 to 20 out of 30 Questions
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