ESCO Gas Heat Exam - Questions with Verified Answers

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A gas furnace to be installed in a garage. The national standards requires that the burners and ignition 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 will dual gas shut off seat Burning one cubic foot of Liquefied Petroleum gas completely will produce approximately ____ BTUs. 2,000 - 2,500 LP gas has a specific gravity of ...? 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? to 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 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? 3.5 in WC The vent system for a condensing furnace is classified as ___ by the National Field Gas Code. Category IV (4) 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 down The reason heating thermostats have anticipators is to: reduce overshoot The typical flow gas temperature of a Category III furnace is: 280 F - 300 F The proper chemical name for natural gas is: Methane Burning one cubic foot of natural gas will produce approximately ___ BTU's. 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: 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 National Fuel Gas Code maximum pressure drop allowance is approximately: 0.5 in WC Gas piping must be installed with a pitch of: 1/4" per 15' run Pipe joint compound should be applied to: male threads less two end threads A technician is installing a copper elbow on LP gas line; what should be used? 15% silver solder To burn one cubic foot of Natural Gas completely, AT LEAST ____ of combustion air must be available. 15 cu ft. [Show More]

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