HVAC Gas Heat certification exam
A gas furnace is to be installed in a garage. The national standards require
✅✅
that the burners and ignition sources must be located ______ above the floor -
-18 inches
✅✅
A good description of how a bi-metal fan switch operates the blower motor on
a gas furnace is - -Temperature on- temperature off
Redundant gas valves used on gas furnaces have - ✅✅-Dual gas shut off
seats
✅✅
Burning one cubic foot of liquefied petroleum gas completely will produce
approximately ______ BTUs - -2000 - 2500
LP gas has a specific gravity of - ✅✅-1.5 - 2.0
✅✅
What is the purpose of a spoiler screw located on a burner, or
adjustable-shutters? - -Mix primary air and gas
Furnace limit switches are wired in series with the - ✅✅-Gas valve
✅✅
A technician is using an extension ladder to work on roof top unit. The top of
the ladder should extend _____ beyond the support point - -3 feet
✅✅
A technician determines that a natural gas furnace has a defective heat
exchanger. The technician should - -Inform the homeowner and turn the
gas off
✅✅
A natural gas furnace usually requires _____ gas pressure at the manifold and
burners - -3.5 in. W.C.
✅✅
The vent system for a condensing furnace is classified as ____ by the
National Field Gas Code. - -Category IV
✅✅
Type B vent pipe must be kept at least _____ from combustible materials -
-One inch
Typical condensing furnaces have an AFUE rating of at least - ✅✅-90%
, You have installed a Category IV two-pipe vent system that terminates through
✅✅
the roof of the residence. The elbow for the combustion air intake, above the
roof, should - -Point it down
The reason heating thermostat have anticipated is to - ✅✅-Reduce lag
The typical flue gas temperature of a Category III furnace is - ✅✅-280°F -
300°F
Natural gas primary consists of - ✅✅-Methane
✅✅
Burning one cubic foot of natural gas will produce approximately _____ BTU's
- -900~1,100
A furnace nameplate specifies a temperature rise of 40 to 70 degrees.
✅✅
Temperature measurements indicate a rise of 80 degrees. The most
appropriate action is to - -Increase fan speed
✅✅
A BTU is the amount of heat required to raise the temperature of one pound of
water - -One degree Fahrenheit
✅✅
Natural gas piping must be sized to prevent excessive pressure drops. The
maximum pressure drop allowance is approximately - -.5 in. W.C.
✅✅-1/4" per 15' run
Gas piping must be installed with a pitch of -
Pipe joint compound should be applied to - ✅✅-Male threads completely
✅✅
A technician is installing a copper elbow on LP gas line; what should be used -
-95/5 solder
✅✅
To burn one cubic foot of Natural Gas completely, at least _____ of
combustion air must be available - -15 cu ft.
The ignition temperature of Natural Gas is - ✅✅-1100°F - 1200°F
Air that is mixes with Natural Gas in the burner is called - ✅✅-Primary air
A gas furnace is to be installed in a garage. The national standards require
✅✅
that the burners and ignition sources must be located ______ above the floor -
-18 inches
✅✅
A good description of how a bi-metal fan switch operates the blower motor on
a gas furnace is - -Temperature on- temperature off
Redundant gas valves used on gas furnaces have - ✅✅-Dual gas shut off
seats
✅✅
Burning one cubic foot of liquefied petroleum gas completely will produce
approximately ______ BTUs - -2000 - 2500
LP gas has a specific gravity of - ✅✅-1.5 - 2.0
✅✅
What is the purpose of a spoiler screw located on a burner, or
adjustable-shutters? - -Mix primary air and gas
Furnace limit switches are wired in series with the - ✅✅-Gas valve
✅✅
A technician is using an extension ladder to work on roof top unit. The top of
the ladder should extend _____ beyond the support point - -3 feet
✅✅
A technician determines that a natural gas furnace has a defective heat
exchanger. The technician should - -Inform the homeowner and turn the
gas off
✅✅
A natural gas furnace usually requires _____ gas pressure at the manifold and
burners - -3.5 in. W.C.
✅✅
The vent system for a condensing furnace is classified as ____ by the
National Field Gas Code. - -Category IV
✅✅
Type B vent pipe must be kept at least _____ from combustible materials -
-One inch
Typical condensing furnaces have an AFUE rating of at least - ✅✅-90%
, You have installed a Category IV two-pipe vent system that terminates through
✅✅
the roof of the residence. The elbow for the combustion air intake, above the
roof, should - -Point it down
The reason heating thermostat have anticipated is to - ✅✅-Reduce lag
The typical flue gas temperature of a Category III furnace is - ✅✅-280°F -
300°F
Natural gas primary consists of - ✅✅-Methane
✅✅
Burning one cubic foot of natural gas will produce approximately _____ BTU's
- -900~1,100
A furnace nameplate specifies a temperature rise of 40 to 70 degrees.
✅✅
Temperature measurements indicate a rise of 80 degrees. The most
appropriate action is to - -Increase fan speed
✅✅
A BTU is the amount of heat required to raise the temperature of one pound of
water - -One degree Fahrenheit
✅✅
Natural gas piping must be sized to prevent excessive pressure drops. The
maximum pressure drop allowance is approximately - -.5 in. W.C.
✅✅-1/4" per 15' run
Gas piping must be installed with a pitch of -
Pipe joint compound should be applied to - ✅✅-Male threads completely
✅✅
A technician is installing a copper elbow on LP gas line; what should be used -
-95/5 solder
✅✅
To burn one cubic foot of Natural Gas completely, at least _____ of
combustion air must be available - -15 cu ft.
The ignition temperature of Natural Gas is - ✅✅-1100°F - 1200°F
Air that is mixes with Natural Gas in the burner is called - ✅✅-Primary air
