HVAC competency exam with
verified answers
If a natural gas piping system fails a pressure test, the technician must re-
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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
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volt, 40 V.A. transformer? - correct answer ✔Transformer will fail due to
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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? -
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correct answer ✔Thermistor
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, Which electronic control is designed to increase or decrease it's resistance
||| ||| ||| ||| ||| ||| ||| ||| ||| ||| |||
with a change in temperature? - correct answer ✔thermistor
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Documents that provide information about the hazardous products are
||| ||| ||| ||| ||| ||| ||| ||| |||
ccalled? - correct answer ✔Safety Data Sheet
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A type B gas vent is? - correct answer ✔Double-walled
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How many BTu's are required to melt one ton of ice in a 24 hour period? -
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correct answer ✔288,000
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What is replaced when changing a fusible link on an electric heater? -
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correct answer ✔High limit switch
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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 |||
verified answers
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 |||
