HVAC competency exam questions
with complete solutions passed
If a natural gas piping system fails a pressure test, the technician must re-pressurize the system
and check for leaks with? - correct answer ✔✔ soap bubbles
a pressure relief valve is installed to? - correct answer ✔✔ avoid exceeding the system limits
In a refrigeration system, what must be installed at 10' intervals on the suction line if the
compressor is above the evaporator? - correct answer ✔✔ Trap
What occurs if a 3 amp load is connected to the secondary winding of a 24 volt, 40 V.A.
transformer? - correct answer ✔✔ Transformer will fail due to an overload
Flue vent pipe size is determined by the? - correct answer ✔✔ Appliance manufacturer and
IFGC
In a split system, the condensing unit is remotely located away from the? - correct answer ✔✔
Thermistor
Which electronic control is designed to increase or decrease it's resistance with a change in
temperature? - correct answer ✔✔ thermistor
Documents that provide information about the hazardous products are ccalled? - correct
answer ✔✔ Safety Data Sheet
A type B gas vent is? - correct answer ✔✔ Double-walled
, How many BTu's are required to melt one ton of ice in a 24 hour period? - correct answer ✔✔
288,000
What is replaced when changing a fusible link on an electric heater? - correct answer ✔✔ High
limit switch
When retro-fitting an R-22 system to a R-407C refrigerant system, it is necessary to change the?
- correct answer ✔✔ Lubricant from mineral oil to POE oil
Which condition exists if the heat loss of a structure equals the capacity output of the system? -
correct answer ✔✔ The balance point has been reached
A combination wiring and crimping tool is used to? - correct answer ✔✔ Cut and strip wire
What is the saturation temperature of R-22 at 69 psig? - correct answer ✔✔ 40 F
If the temperature rise (delta T) of the heat exhanger on a gas furnace exceeds the
manufacturers specifications, the technician should do _____? - correct answer ✔✔ increase
the motor speed for higher CFM
The nominal CFM required per ton of air conditioning is? - correct answer ✔✔ 400
Which refrigerant has a zero ozone depletion potential but is still considered a greenhouse gas?
- correct answer ✔✔ R134a
If a TXV power element loses its charge it results in a? - correct answer ✔✔ Starved evaporator
with complete solutions passed
If a natural gas piping system fails a pressure test, the technician must re-pressurize the system
and check for leaks with? - correct answer ✔✔ soap bubbles
a pressure relief valve is installed to? - correct answer ✔✔ avoid exceeding the system limits
In a refrigeration system, what must be installed at 10' intervals on the suction line if the
compressor is above the evaporator? - correct answer ✔✔ Trap
What occurs if a 3 amp load is connected to the secondary winding of a 24 volt, 40 V.A.
transformer? - correct answer ✔✔ Transformer will fail due to an overload
Flue vent pipe size is determined by the? - correct answer ✔✔ Appliance manufacturer and
IFGC
In a split system, the condensing unit is remotely located away from the? - correct answer ✔✔
Thermistor
Which electronic control is designed to increase or decrease it's resistance with a change in
temperature? - correct answer ✔✔ thermistor
Documents that provide information about the hazardous products are ccalled? - correct
answer ✔✔ Safety Data Sheet
A type B gas vent is? - correct answer ✔✔ Double-walled
, How many BTu's are required to melt one ton of ice in a 24 hour period? - correct answer ✔✔
288,000
What is replaced when changing a fusible link on an electric heater? - correct answer ✔✔ High
limit switch
When retro-fitting an R-22 system to a R-407C refrigerant system, it is necessary to change the?
- correct answer ✔✔ Lubricant from mineral oil to POE oil
Which condition exists if the heat loss of a structure equals the capacity output of the system? -
correct answer ✔✔ The balance point has been reached
A combination wiring and crimping tool is used to? - correct answer ✔✔ Cut and strip wire
What is the saturation temperature of R-22 at 69 psig? - correct answer ✔✔ 40 F
If the temperature rise (delta T) of the heat exhanger on a gas furnace exceeds the
manufacturers specifications, the technician should do _____? - correct answer ✔✔ increase
the motor speed for higher CFM
The nominal CFM required per ton of air conditioning is? - correct answer ✔✔ 400
Which refrigerant has a zero ozone depletion potential but is still considered a greenhouse gas?
- correct answer ✔✔ R134a
If a TXV power element loses its charge it results in a? - correct answer ✔✔ Starved evaporator
