313D Final Exam Prep Test Questions
and Already Passed Answers 2025-
2026 Edition.
Can you use a low-pressure control as a thermostat on a system with a capillary tube metering
device?
- No you can not
In the question above why can you or why can't you use a low-pressure control as a thermostat
with a system utilizing a capillary tube as a metering device?
A. You can because of the pressure temperature relationship of refrigerants, once you have the
proper cut in and cut out pressures, cooler will maintain proper temperature.
B. You can't because with a capillary tube system the refrigerant pressures will equalize in the
off cycle. - Answer B. You can't because with a capillary tube system the refrigerant pressures
will equalize in the off cycle.
The best term to describe "reclaim"?
A. Take refrigerant out of the air conditioning unit, and place in an approved container.
B. Take refrigerant out of the air conditioning unit, and place in an approved container, and
return the refrigerant to the system once repaired.
C. Take refrigerant out of the air conditioning unit, and place in an approved container, put
refrigerant through an on site oil separation and distillation process, and return the refrigerant
to the system once repaired.
D. Take refrigerant out of the air conditioning unit, and place in an approved container, send
refrigerant off site for oil separation and distillation process, and refrigerant is sold back to the
industry as new refrigerant. - Answer D. Take the refrigerant out of the air conditioning unit,
and place in an approved container, send refrigerant off-site for oil separation and distillation
process, and refrigerant is sold back to the industry as new refrigerant.
TX valve as we know from our studies is designed to maintain a constant superheat in the
evaporator coil, What happens when the evaporator coil freezes over?
A. TX valve maintains a constant superheat under all load conditions even as evaporator coil
,a heat pump with a reversing valve that is leaking internally cause?
A. The compressor amperage to increase
B. The condenser to frost (in cooling mode)
C. A leak of refrigerant to the outdoor environment.
D. Causes high suction pressure and low discharge pressure. - Answer D. Causes high suction
pressure and low discharge pressure.
If a new air conditioner system is installed with a 45 foot line set, and the unit is pre charged
with refrigerant for a 15 foot line set, and the installation instructions indicate to add .6 ounces
for each additional foot of line set, to correctly charge the equipment the technician would
add?
A. Add 24 ounces (1 lb 8 oz) of refrigerant.
B. Add 18 ounces (1 lb 2 oz) of refrigerant.
C. Remove 4 ounces of refrigerant.
D. Add 32 (2 lbs) ounces of refrigerant. - Answer 45-15=30
30x.6=18
B. Add 18 ounces or (1 lb 2 oz.) of refrigerant.
The most common type of compressor found in residential air conditioning is?
A. The capacitor start induction run (CSIR)
B. The capacitor start capacitor run (CSCR)
C. The shaded pole.
D. The permanent split capacitor (PSC) - Answer D. The permanent Split Capacitor. (PSC)
The type of soft drawn copper used in residential air conditioning systems is?
A. Type L
B. Type M
,A. In series with the start winding.
B. In parallel with the run winding.
C. In series with the run winding.
D. In parallel with the Strat winding. - Answer A. In series with the start winding.
Capacitors used in air conditioning systems are measured in?
A. Volts (V)
B. Watts (W)
C. Microfarads (uf)
D. Coulombs (C) - Answer C. Microfarads
The most preferred substance used for air conditioning system pressure testing is?
A. Refrigerant
B. Oxygen
C. Compressed air.
D. Nitrogen - Answer D. Nitrogen
The vacuum pump is used to?
A. Remove refrigerant from the air conditioning system.
B. Remove oxygen and moisture from the air.
C. Remove oxides from the air conditioning system.
D. Filter and clean system oil. - Answer B. Remove oxygen and moisture from the air.
A clogged furnace air filter will cause?
A. High liquid pressure in the condenser.
B. A mixture of liquid and vaporized refrigerant entering the metering device.
, A. R12
B. R22
C. R502
D. R410A - Answer D. R410A
HFC refrigerants do not contain?
A. Hydrogen
B. Carbon
C. Chlorine
D. Flourine - Answer C. Chlorine
When checking an electrical circuit continuity the most important safety rule is?
A. Use electricity rated tools and safety equipment.
B. Select the highest voltage setting on the electrical meter.
C. Disconnect the power supply to the air conditioning system.
D. Discharge the blower motor before taking resistance readings> - Answer C. Disconnect the
power supply to the air conditioning system.
CFC based refrigerants break down in upper atmosphere due to?
A. UV light from the sun.
B. Chlorine in the refrigerant.
C. Hydrogen in the refrigerant.
D. Water vapour found in the upper atmosphere. - Answer A. UV light from the sun.
When the line set on an installed air conditioning system is longer than 50 feet in length the
technician should?
A. Increase the suction line diameter by one size.
and Already Passed Answers 2025-
2026 Edition.
Can you use a low-pressure control as a thermostat on a system with a capillary tube metering
device?
- No you can not
In the question above why can you or why can't you use a low-pressure control as a thermostat
with a system utilizing a capillary tube as a metering device?
A. You can because of the pressure temperature relationship of refrigerants, once you have the
proper cut in and cut out pressures, cooler will maintain proper temperature.
B. You can't because with a capillary tube system the refrigerant pressures will equalize in the
off cycle. - Answer B. You can't because with a capillary tube system the refrigerant pressures
will equalize in the off cycle.
The best term to describe "reclaim"?
A. Take refrigerant out of the air conditioning unit, and place in an approved container.
B. Take refrigerant out of the air conditioning unit, and place in an approved container, and
return the refrigerant to the system once repaired.
C. Take refrigerant out of the air conditioning unit, and place in an approved container, put
refrigerant through an on site oil separation and distillation process, and return the refrigerant
to the system once repaired.
D. Take refrigerant out of the air conditioning unit, and place in an approved container, send
refrigerant off site for oil separation and distillation process, and refrigerant is sold back to the
industry as new refrigerant. - Answer D. Take the refrigerant out of the air conditioning unit,
and place in an approved container, send refrigerant off-site for oil separation and distillation
process, and refrigerant is sold back to the industry as new refrigerant.
TX valve as we know from our studies is designed to maintain a constant superheat in the
evaporator coil, What happens when the evaporator coil freezes over?
A. TX valve maintains a constant superheat under all load conditions even as evaporator coil
,a heat pump with a reversing valve that is leaking internally cause?
A. The compressor amperage to increase
B. The condenser to frost (in cooling mode)
C. A leak of refrigerant to the outdoor environment.
D. Causes high suction pressure and low discharge pressure. - Answer D. Causes high suction
pressure and low discharge pressure.
If a new air conditioner system is installed with a 45 foot line set, and the unit is pre charged
with refrigerant for a 15 foot line set, and the installation instructions indicate to add .6 ounces
for each additional foot of line set, to correctly charge the equipment the technician would
add?
A. Add 24 ounces (1 lb 8 oz) of refrigerant.
B. Add 18 ounces (1 lb 2 oz) of refrigerant.
C. Remove 4 ounces of refrigerant.
D. Add 32 (2 lbs) ounces of refrigerant. - Answer 45-15=30
30x.6=18
B. Add 18 ounces or (1 lb 2 oz.) of refrigerant.
The most common type of compressor found in residential air conditioning is?
A. The capacitor start induction run (CSIR)
B. The capacitor start capacitor run (CSCR)
C. The shaded pole.
D. The permanent split capacitor (PSC) - Answer D. The permanent Split Capacitor. (PSC)
The type of soft drawn copper used in residential air conditioning systems is?
A. Type L
B. Type M
,A. In series with the start winding.
B. In parallel with the run winding.
C. In series with the run winding.
D. In parallel with the Strat winding. - Answer A. In series with the start winding.
Capacitors used in air conditioning systems are measured in?
A. Volts (V)
B. Watts (W)
C. Microfarads (uf)
D. Coulombs (C) - Answer C. Microfarads
The most preferred substance used for air conditioning system pressure testing is?
A. Refrigerant
B. Oxygen
C. Compressed air.
D. Nitrogen - Answer D. Nitrogen
The vacuum pump is used to?
A. Remove refrigerant from the air conditioning system.
B. Remove oxygen and moisture from the air.
C. Remove oxides from the air conditioning system.
D. Filter and clean system oil. - Answer B. Remove oxygen and moisture from the air.
A clogged furnace air filter will cause?
A. High liquid pressure in the condenser.
B. A mixture of liquid and vaporized refrigerant entering the metering device.
, A. R12
B. R22
C. R502
D. R410A - Answer D. R410A
HFC refrigerants do not contain?
A. Hydrogen
B. Carbon
C. Chlorine
D. Flourine - Answer C. Chlorine
When checking an electrical circuit continuity the most important safety rule is?
A. Use electricity rated tools and safety equipment.
B. Select the highest voltage setting on the electrical meter.
C. Disconnect the power supply to the air conditioning system.
D. Discharge the blower motor before taking resistance readings> - Answer C. Disconnect the
power supply to the air conditioning system.
CFC based refrigerants break down in upper atmosphere due to?
A. UV light from the sun.
B. Chlorine in the refrigerant.
C. Hydrogen in the refrigerant.
D. Water vapour found in the upper atmosphere. - Answer A. UV light from the sun.
When the line set on an installed air conditioning system is longer than 50 feet in length the
technician should?
A. Increase the suction line diameter by one size.
