3B2 C8-11 Practice Questions With Complete Solutions
Rotary compressors common types include sliding vane, rotary lobe, and ----------.
rotary screw
In centrifugal compressors, the straighter its blades are, the more pressure is
converted in the impeller.
a. True
b. False
The prime purpose of water cooling or air cooling of air compressors is to:
a. help increase moisture and volume of the air
b. prevent operator injury
c. keep the cylinder at a reasonable temperature
d. cool the air
e. prevent fire from occurring in the receiver
In multistage compression the high pressure cylinders are smaller because the
volume is _____ than the lower pressure ranges.
a. Larger and the pressure is higher.
b. The same and the pressure is higher.
c. Larger and the pressure is the same.
d. Less and the pressure is lower.
e. Less and the pressure is higher.
A free piston air compressor:
a. has two crankshaft
b. has a cushion cylinder that acts as a flywheel
c. has a common intake and discharge valve system
d. has a spare or free piston for air compression
e. uses one steam cylinder to drive two compression pistons
A two cylinder compressor, one vertical and the other horizontal, is called:
a. A Y type compressor.
b. An angle compressor.
, c. A V type compressor.
d. A vertical type compressor.
e. A horizontal type compressor.
In the axial flow compressors as the air passes through the fixed blades its gas
(air) velocity is increased.
a. True
b. False
Calculate the displacement in m3/min of a single-acting compressor with a first
stage cylinder bore of 15 cm, a stroke of 11 cm and is run at 825 rev/min.
a. 1.07
b. 10.69
c. 1.60
d. 21.38
e. 16.04
In a centrifugal compressor only part of the gas (air) velocity energy is converted
to pressure in its ----------.
Blades
A one stage reciprocating compressor may be used for compression of up to ------
-- kPa.
1000
Rotary screw compressors have two intermeshing rotors, machined in the form
of a/an ------------ screws.
Axial
Calculate the displacement in m3/min of a single-acting compressor with a first
stage cylinder bore of 15 cm, a stroke of 11 cm and is run at 825 rev/min.
a. 16.04
b. 21.38
c. 1.07
d. 10.69
e. 1.60
In the sliding vane compressors, the gas is compressed due to the ----------
between its rotor and cylinder.
eccentricity
Rotary compressors common types include sliding vane, rotary lobe, and ----------.
rotary screw
In centrifugal compressors, the straighter its blades are, the more pressure is
converted in the impeller.
a. True
b. False
The prime purpose of water cooling or air cooling of air compressors is to:
a. help increase moisture and volume of the air
b. prevent operator injury
c. keep the cylinder at a reasonable temperature
d. cool the air
e. prevent fire from occurring in the receiver
In multistage compression the high pressure cylinders are smaller because the
volume is _____ than the lower pressure ranges.
a. Larger and the pressure is higher.
b. The same and the pressure is higher.
c. Larger and the pressure is the same.
d. Less and the pressure is lower.
e. Less and the pressure is higher.
A free piston air compressor:
a. has two crankshaft
b. has a cushion cylinder that acts as a flywheel
c. has a common intake and discharge valve system
d. has a spare or free piston for air compression
e. uses one steam cylinder to drive two compression pistons
A two cylinder compressor, one vertical and the other horizontal, is called:
a. A Y type compressor.
b. An angle compressor.
, c. A V type compressor.
d. A vertical type compressor.
e. A horizontal type compressor.
In the axial flow compressors as the air passes through the fixed blades its gas
(air) velocity is increased.
a. True
b. False
Calculate the displacement in m3/min of a single-acting compressor with a first
stage cylinder bore of 15 cm, a stroke of 11 cm and is run at 825 rev/min.
a. 1.07
b. 10.69
c. 1.60
d. 21.38
e. 16.04
In a centrifugal compressor only part of the gas (air) velocity energy is converted
to pressure in its ----------.
Blades
A one stage reciprocating compressor may be used for compression of up to ------
-- kPa.
1000
Rotary screw compressors have two intermeshing rotors, machined in the form
of a/an ------------ screws.
Axial
Calculate the displacement in m3/min of a single-acting compressor with a first
stage cylinder bore of 15 cm, a stroke of 11 cm and is run at 825 rev/min.
a. 16.04
b. 21.38
c. 1.07
d. 10.69
e. 1.60
In the sliding vane compressors, the gas is compressed due to the ----------
between its rotor and cylinder.
eccentricity
