FLT410: 8HVAC UNIT 23 COMPRESSORS
EXAM QUESTIONS WITH CORRECT
ANSWERS
\.1. Describe the operation of a compressor. - ANSWERS-Vapor pump- It
increases suction pressure level to the discharge pressure level. Takes a
low pressure low temp vapor compresses it into a high pressure, high
temp vapor.
\.2. Name five types of compressors. - ANSWERS-Reciprocating, screw,
rotary, scroll, centrifugal.
\.3. True or false: A compressor can compress a liquid. - ANSWERS-
False.
\.4. What would be considered a higher-than-normal temp for a
discharge gas line on a reciprocating compressor. - ANSWERS-B. 215
degrees Fahrenheit.
\.5. Which compressor type uses pistons to compress the gas. -
ANSWERS-B. Reciprocating.
, \.6. Which compressor type uses tapered, machine gear components to
trap the gas for compression. - ANSWERS-D. Screw.
\.7. Which style of compressor uses belts to turn the compressor. -
ANSWERS-A. Open drive.
\.8. What would be done to increase the compressor speed on a belt-
driven compressor. - ANSWERS-A. Decrease drive pulley size.
\.9. Describe the reciprocating compressor piston, rod, crankshaft,
valves, valve plate, head, shaft seal, internal motor overload device,
pilot-duty motor overload device, and coupling. - ANSWERS-
Reciprocating compressor piston- Part of the cylinder assembly exposed
to high pressure gas during compression.
Rod- Connects the piston to the crankshaft.
Crankshaft- Transmits the circular motion of the rods.
Valves- At the top of the compressor determines the direction of gas
flow.
Valve plate- Holds the suction and discharge flapper valves.
Head- The component that holds together the cylinder and the
assembly of it.
Shaft seal- Has a rubber surface so refrigerant and the atmosphere
don't mix.
EXAM QUESTIONS WITH CORRECT
ANSWERS
\.1. Describe the operation of a compressor. - ANSWERS-Vapor pump- It
increases suction pressure level to the discharge pressure level. Takes a
low pressure low temp vapor compresses it into a high pressure, high
temp vapor.
\.2. Name five types of compressors. - ANSWERS-Reciprocating, screw,
rotary, scroll, centrifugal.
\.3. True or false: A compressor can compress a liquid. - ANSWERS-
False.
\.4. What would be considered a higher-than-normal temp for a
discharge gas line on a reciprocating compressor. - ANSWERS-B. 215
degrees Fahrenheit.
\.5. Which compressor type uses pistons to compress the gas. -
ANSWERS-B. Reciprocating.
, \.6. Which compressor type uses tapered, machine gear components to
trap the gas for compression. - ANSWERS-D. Screw.
\.7. Which style of compressor uses belts to turn the compressor. -
ANSWERS-A. Open drive.
\.8. What would be done to increase the compressor speed on a belt-
driven compressor. - ANSWERS-A. Decrease drive pulley size.
\.9. Describe the reciprocating compressor piston, rod, crankshaft,
valves, valve plate, head, shaft seal, internal motor overload device,
pilot-duty motor overload device, and coupling. - ANSWERS-
Reciprocating compressor piston- Part of the cylinder assembly exposed
to high pressure gas during compression.
Rod- Connects the piston to the crankshaft.
Crankshaft- Transmits the circular motion of the rods.
Valves- At the top of the compressor determines the direction of gas
flow.
Valve plate- Holds the suction and discharge flapper valves.
Head- The component that holds together the cylinder and the
assembly of it.
Shaft seal- Has a rubber surface so refrigerant and the atmosphere
don't mix.
