Top 50+ Solved Air Compressors MCQ Questions Answer
Q. Reciprocating air compressor is best suited for
a. large quantity of air at high pressure
b. small quantity of air at high pressure
c. small quantity of air at low pressure
d. large quantity of air at low pressure
Q. Rotary compressor is best suited for
a. large quantity of air at high pressure
b. small quantity of air at high pressure
c. small quantity of air at low pressure
d. large quantity of air at low pressure
Q. After-cooler is used to
a. cool the air
b. decrease the delivery temperature for ease in handling
c. cause moisture and oil vapour to drop out
d. reduce volume
Q. The compressor performance at higher altitude compared to sea level will be
a. same
b. higher
c. lower
d. dependent on other factors
Q. Pick up the wrong statement about advantages of multistage compression
a. better lubrication is possible advantages of multistage
b. more loss of air due to leakage past the cylinder
c. mechanical balance is better
d. air can be cooled perfectly in between
Q. Losses in a centrifugal compressor are due to
a. inlet losses
b. impeller channel losses
c. diffuser losses
d. all of the above
Q. For supplying intermittent small quantity of air at high pressure, following compressor is best suited
a. centrifugal
b. reciprocating
c. axial
d. screw
Q. For minimum work in multistage compression, assuming same index of compression in all stages
a. work done in first stage should be more
b. work done in subsequent stages should increase
c. work done in subsequent stages should decrease
d. work done in all stages should be equal
Q. Diffuser in a compressor is used to
a. increase velocity
b. make the flow stream-line
c. convert pressure energy into kinetic energy
d. convert kinetic energy into pressure energy
Q. Phenomenon of choking in compressor means
a. no flow of air
b. fixed mass flow rate regardless of pressure ratio
c. reducing mass flow rate with increase in pressure ratio
d. increased inclination of chord with air steam
Q. Axial flow compressor has the following advantage over centrifugal compressor
a. larger air handling ability per unit frontal area
b. higher pressure ratio per stage
c. aerofoil blades are used
d. higher average velocities
Q. Rotary compressors are suitable for
a. large discharge at high pressure
b. low discharge at high pressure
c. large discharge at low pressure
d. low discharge at low pressure
Q. The vloumetric efficiency of compressor with increase in compression ratio will
a. increase
b. decrease
c. remain same
d. may increase/decrease depending on clearance volume