Compressor Theory and Designs Chapter 8 Test Questions with Verified Answers
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Module
Compressor Theory and Designs
Institution
Compressor Theory And Designs
Compressor Theory and Designs Chapter 8 Test Questions with Verified Answers
If _____ is used then the cylinder is constructed with integral cast fins which provide increased radiating area.
a. Water cooling.
b. A water jacket.
c. Glycol cooling.
d. A sliding vane compressor.
e. Air coolin...
Compressor Theory and Designs
Chapter 8 Test Questions with
Verified Answers
If _____ is used then the cylinder is constructed with integral cast fins which provide
increased radiating area.
a. Water cooling.
b. A water jacket.
c. Glycol cooling.
d. A sliding vane compressor.
e. Air cooling. - Answer-e
The lobe type compressor runs at speeds up to about _____ RPM.
a. 1550.
b. 1600.
c. 1650.
d. 1700.
e. 1750. - Answer-e
A _____ is a type of rotary compressor.
a. Two lobe.
b. Cross - compound double cylinder.
c. Sliding piston.
d. Axial.
e. Centrifugal. - Answer-a
Rotary lobe compressors have their elements:
a. Lubricated by graphite.
b. Enclosed by an aluminum casing.
c. As spring loaded vanes.
d. Revolving in opposite directions.
e. Lubricated by oil. - Answer-d
The impellers of a _____ compressor maintain their relative positions with each other by
the use of timing gears.
a. Sliding vane type.
b. Free piston type.
c. Axial flow type.
d. Angle types.
e. Rotary lobe type. - Answer-e
,The two-stage sliding vane compressors:
a. Have a common decompression chamber.
b. Are driven by separate motors.
c. Does not require internal lubrication.
d. Share a common drive motor.
e. Can operate at two different RPM's. - Answer-d
_____ positive displacement compressors require intake and discharge valves.
a. Rotary.
b. Centrifugal.
c. Sliding vane.
d. Rotary lobe.
e. Reciprocating - Answer-e
Reciprocating compressors are suitable for:
a. Low pressure service.
b. High pressure service.
c. All ranges of pressures.
d. Single stage only.
e. Compressing only air. - Answer-c
Dynamic compressors require the air to be accelerated then convert the:
a. Pressure to volume.
b. Pressure to velocity.
c. Velocity to volume.
d. Volume to velocity.
e. Velocity to pressure. - Answer-e
Reciprocating compressors have several disadvantages as compared
to other positive displacement compressors, such as:
1. They cannot be made multi staged.
2. They give pulsating discharge.
3. They require internal lubrication.
4. They have many moving parts.
5. They are usually low speed.
a. 3, 4, 5
b. 1, 2, 5
c. 2, 3, 4
d. 1, 3, 5
e. 2, 4, 5. - Answer-c
A double acting reciprocating compressor:
a. Receives and compresses air at the head end of the cylinder.
b. Receives and discharges air at both ends of the cylinder.
c. Increases the pressure twice from the inlet valve.
d. Has one compression stroke for every crankshaft revolution.
, e. Must have at least two pistons. - Answer-b
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. 10.69 m3/min
b. 1.60 m3/min
c. 1.07 m3/min
d. 16.04 m3/min
e. 21.38 m3/min. - Answer-b
Reciprocating compressor valves are usually found in two common forms:
a. Plate and channel type.
b. Composition and rubber type.
c. Copper and aluminum type.
d. Angle and inverted type.
e. Ribbed and push rod type - Answer-a
A single cylinder compressor with a high compression ratio results in:
1. Low discharge temperature.
2. Low volumetric efficiency.
3. High discharge temperature.
4. High volumetric efficiency.
5. A corresponding reduction in speed of the prime mover.
a. 1, 3
b. 3, 2
c. 4, 5
d. 1, 4
e. 2, 5 - Answer-b
In order to overcome high compression ratio:
a. The air temperature needs to be increased.
b. The volumetric efficiency needs to be decreased.
c. An air receiver is needed.
d. Compression must be carried in two or more stages.
e. Slow the speed of the prime mover. - Answer-d
When a two-cylinder compressor has two stages, the compressor displacement is
calculated by calculating the volume of:
a. The first piston.
b. The last piston divided by the volume of the first.
c. Both pistons.
d. The first piston divided by the volume of the last.
e. The last piston. - Answer-a
External lubrication for an air compressor includes lubrication for the following parts:
1. Crankshaft bearings.
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