ESCO Gas Heat Exam questions with Correct
Verified Answers
A gas furnace to be installed in a garage. The national standards requires that the
burners and ignition must be located ____ above the floor: - ANS 18 inches
A good description of how a bi-metal fan switch operates the blower motor on a gas
furnace is: - ANS Temperature on/ Temperature off
Redundant gas valves used on gas furnaces will shut down if gas pressure exceeds: - ANS
13.5 in W.C. (or 1/2 psi)
This is the maximum pressure for gas valve operation
Burning one cubic foot of Liquefied Petroleum gas completely will produce
approximately ____ BTUs. - ANS 2,000 - 2,500
LP gas has a specific gravity of ...? - ANS 1.5 - 2.0 ( actual is 1.5 heavier than air which is
1.0)
What is the purpose of a spoiler screw located on a burner, or adjustable-shutters? -
ANS to mix primary air and gas
Furnace limit switches are wired in series with the: - ANS 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. - ANS 3 feet
A technician determines that a natural gas furnace has a defective heat exchanger. The
technician should: - ANS Inform the home owner and turn the gas off.
, A natural gas furnace usually requires _____ gas pressure AT the manifold and burners.
What should the inlet pressure be to the manifold? - ANS 3.5 in WC
inlet- 5-7 in WC
The vent system for a condensing furnace is classified as ___ by the National Field Gas
Code. - ANS Category IV (4)
Type B vent pipe must be kept at least ____ from combustible materials. - ANS one inch
Typical condensing furnaces have an AFUE rating of at least: - ANS 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...? -
ANS Point down
The reason heating thermostats have anticipators is to: - ANS reduce overshoot
The typical fluw gas temperature of a Category III furnace is: - ANS 280 F - 300 F
The proper chemical name for natural gas is: - ANS Methane
Burning one cubic foot of natural gas will produce approximately ___ BTU's. - ANS 900-
1100
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 fan speed
Verified Answers
A gas furnace to be installed in a garage. The national standards requires that the
burners and ignition must be located ____ above the floor: - ANS 18 inches
A good description of how a bi-metal fan switch operates the blower motor on a gas
furnace is: - ANS Temperature on/ Temperature off
Redundant gas valves used on gas furnaces will shut down if gas pressure exceeds: - ANS
13.5 in W.C. (or 1/2 psi)
This is the maximum pressure for gas valve operation
Burning one cubic foot of Liquefied Petroleum gas completely will produce
approximately ____ BTUs. - ANS 2,000 - 2,500
LP gas has a specific gravity of ...? - ANS 1.5 - 2.0 ( actual is 1.5 heavier than air which is
1.0)
What is the purpose of a spoiler screw located on a burner, or adjustable-shutters? -
ANS to mix primary air and gas
Furnace limit switches are wired in series with the: - ANS 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. - ANS 3 feet
A technician determines that a natural gas furnace has a defective heat exchanger. The
technician should: - ANS Inform the home owner and turn the gas off.
, A natural gas furnace usually requires _____ gas pressure AT the manifold and burners.
What should the inlet pressure be to the manifold? - ANS 3.5 in WC
inlet- 5-7 in WC
The vent system for a condensing furnace is classified as ___ by the National Field Gas
Code. - ANS Category IV (4)
Type B vent pipe must be kept at least ____ from combustible materials. - ANS one inch
Typical condensing furnaces have an AFUE rating of at least: - ANS 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...? -
ANS Point down
The reason heating thermostats have anticipators is to: - ANS reduce overshoot
The typical fluw gas temperature of a Category III furnace is: - ANS 280 F - 300 F
The proper chemical name for natural gas is: - ANS Methane
Burning one cubic foot of natural gas will produce approximately ___ BTU's. - ANS 900-
1100
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 fan speed
