HVAC lvl 2 Compressors 03302 Test Questions
with Correct Answers
On which leg of a single-phase motor should total compressor current be measured?
A. Neutral
B. Start
C. Run
D. Common
D. Common
When is a technician most likely to see foaming in an oil-level site glass?
A. When the compressor shuts down
B. Just before the compressor starts
C. When the compressor starts
D. After several minutes of operating time
C. When the compressor starts
If a systems refrigerant lines are long...
,A. The compressor may not be able to complete a pump-down cycle
B. The compressor cannot overcome the pressure drop
C. More time should be allowed between compressor starts
D. The system pressures will never equalize
A. The compressor may not be able to complete a pump-down cycle
Refrigerant lines that are buried underground can cause...
A. Copper tubing to last only several years
B. The pressure to drop significantly
C. Refrigerant to condense in the suction line
D. Vapor to be trapped in the evaporator coil
C. Refrigerant to condense in the suction line
A compressor short cycling protection device is installed in the...
A. Series with the compressor common lead
B. Parallel with the compressor contactor
, C. The compressors control circuit
D. Parallel with the room thermostat
C. The compressors control circuit
A compressor internal pressure-relief valve is usually set...
A. By adjusting it while watching an ammeter
B. Through the installers menu of the thermostat
C. To open at a higher pressure than a high-pressure safety switch
D. To close when the refrigerant circuit goes into a vacuum
C. To open at a higher pressure than a high-pressure safety switch
A technician can tell when the internal line break overload of a single phase compressor
is remaining open when...
A. There is no continuity through the common winding
B. The winding show continuity to ground
C. The compressor is noisy, but isn't pumping
D. The compressor is silent, but draws a small amount of current
with Correct Answers
On which leg of a single-phase motor should total compressor current be measured?
A. Neutral
B. Start
C. Run
D. Common
D. Common
When is a technician most likely to see foaming in an oil-level site glass?
A. When the compressor shuts down
B. Just before the compressor starts
C. When the compressor starts
D. After several minutes of operating time
C. When the compressor starts
If a systems refrigerant lines are long...
,A. The compressor may not be able to complete a pump-down cycle
B. The compressor cannot overcome the pressure drop
C. More time should be allowed between compressor starts
D. The system pressures will never equalize
A. The compressor may not be able to complete a pump-down cycle
Refrigerant lines that are buried underground can cause...
A. Copper tubing to last only several years
B. The pressure to drop significantly
C. Refrigerant to condense in the suction line
D. Vapor to be trapped in the evaporator coil
C. Refrigerant to condense in the suction line
A compressor short cycling protection device is installed in the...
A. Series with the compressor common lead
B. Parallel with the compressor contactor
, C. The compressors control circuit
D. Parallel with the room thermostat
C. The compressors control circuit
A compressor internal pressure-relief valve is usually set...
A. By adjusting it while watching an ammeter
B. Through the installers menu of the thermostat
C. To open at a higher pressure than a high-pressure safety switch
D. To close when the refrigerant circuit goes into a vacuum
C. To open at a higher pressure than a high-pressure safety switch
A technician can tell when the internal line break overload of a single phase compressor
is remaining open when...
A. There is no continuity through the common winding
B. The winding show continuity to ground
C. The compressor is noisy, but isn't pumping
D. The compressor is silent, but draws a small amount of current
