ESCO Gas Furnace Test questions with Correct
Verified Answers
Burning one cubic foot of natural gas will produce approximately _____ BTU's - ANS
900-1,100 BTU
The Natural Fuel Gas code classifies a vent system for a condensing furnace as : - ANS
Category IV
what type of draft is used to move flue gas through the heat exchanger and into the
venting system in modern gas-fired furnaces? - ANS Mechanical
A customer complains that a 2-year-old, direct, hot surface ignition furnace will not
light. The inducer motor runs, the pressure switch closes, and the igniter begins to glow,
but there is no ignition. The furnace locks out while attempting to light. After resetting
the furnace, 17 VAC is measured at the gas valve and the technician correctly concludes:
- ANS The Electonic board is faulty
The efficiency rating of gas-burning appliance is determined using: - ANS Annual Fuel
Utilization Efficiency (AFUE)
when the burners of a furnace are ignited the blower motor operation is delayed to: -
ANS Allow heat exchanger to warm up
Typical condensing furnaces have an AFUE rating of at least - ANS 90%
A gas furnace has an integrated furnace control (IFC). How is the fan cycled during
heating? - ANS Heat Relay
, What reading should a good thermocouple produce on a DC meter - ANS 30 millivolts
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: - ANS
Increase the fan speed
The most common burner used in induced draft furnace is: - ANS In-shot
You are installing 1/2 and 3/4 black iron pipe to a natural gas furnace. When threading,
what is the approximate number of threads to cut? - ANS 7-10
When exposed to low concentrations of carbon monoxide, healthy adults may exhibit: -
ANS Headaches and Nausea
If voltage is applied across two speed terminals on a fan motor, the motor will - ANS
Short-out/Burn-out
to react to a change in temperature, the fan/limit switch in a standing pilot furnace uses
a helical shaft made of - ANS Bi-metal
How much combustion air is required to burn and properly vent once cubic foot of
natural gas? - ANS 10 Cu.Ft
most thermostats contain one or more sets of contacts to control the heating system of
a conditioned space. These contacts - ANS Are thermally Actuated.
Carbon monoxide (C0) is dangerous. What is the maximum level of undiluted CO that is
acceptable in a sample of the flue gas? - ANS 400 ppm
Verified Answers
Burning one cubic foot of natural gas will produce approximately _____ BTU's - ANS
900-1,100 BTU
The Natural Fuel Gas code classifies a vent system for a condensing furnace as : - ANS
Category IV
what type of draft is used to move flue gas through the heat exchanger and into the
venting system in modern gas-fired furnaces? - ANS Mechanical
A customer complains that a 2-year-old, direct, hot surface ignition furnace will not
light. The inducer motor runs, the pressure switch closes, and the igniter begins to glow,
but there is no ignition. The furnace locks out while attempting to light. After resetting
the furnace, 17 VAC is measured at the gas valve and the technician correctly concludes:
- ANS The Electonic board is faulty
The efficiency rating of gas-burning appliance is determined using: - ANS Annual Fuel
Utilization Efficiency (AFUE)
when the burners of a furnace are ignited the blower motor operation is delayed to: -
ANS Allow heat exchanger to warm up
Typical condensing furnaces have an AFUE rating of at least - ANS 90%
A gas furnace has an integrated furnace control (IFC). How is the fan cycled during
heating? - ANS Heat Relay
, What reading should a good thermocouple produce on a DC meter - ANS 30 millivolts
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: - ANS
Increase the fan speed
The most common burner used in induced draft furnace is: - ANS In-shot
You are installing 1/2 and 3/4 black iron pipe to a natural gas furnace. When threading,
what is the approximate number of threads to cut? - ANS 7-10
When exposed to low concentrations of carbon monoxide, healthy adults may exhibit: -
ANS Headaches and Nausea
If voltage is applied across two speed terminals on a fan motor, the motor will - ANS
Short-out/Burn-out
to react to a change in temperature, the fan/limit switch in a standing pilot furnace uses
a helical shaft made of - ANS Bi-metal
How much combustion air is required to burn and properly vent once cubic foot of
natural gas? - ANS 10 Cu.Ft
most thermostats contain one or more sets of contacts to control the heating system of
a conditioned space. These contacts - ANS Are thermally Actuated.
Carbon monoxide (C0) is dangerous. What is the maximum level of undiluted CO that is
acceptable in a sample of the flue gas? - ANS 400 ppm
