NFI Exam Review Questions and answers Newest RATED A+ 2025/2026 NEWEST 100% PASS

NFI Exam Review Questions and answers Newest RATED
A+ 2025/2026 NEWEST 100% PASS
Combustion Requirements (3) - Correct Answers Air, Fuel, Heat Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




Il` Complete Combustion Produces (4) - Correct Answers Water vapor, carbon dioxide, heat, and
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Il` non combustible ashes
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Il` incomplete combustion produces (3) - Correct Answers carbon monoxide, hydrocarbons, and
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Il` other gases Il`




Il` rate at which fuel burns is controlled by - Correct Answers the amount of available air
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Il` air to fuel ratio is a - Correct Answers critical factor in obtaining optimum fuel combustion
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Il` BTU - Correct Answers British Thermal Unit, The amount of energy needed to heat one pound of
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Il` water one degree Fahrenheit Il` Il` Il`




Il` wood ignites at - Correct Answers 450-550 F
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Il` natural gas ignites at - Correct Answers 1,150 F
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Il` propane ignites at - Correct Answers 920-1120 FIl` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




Il` electric spark temp - Correct Answers 1,700 F
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Il` hot surface igniter temp - Correct Answers 2,400 F
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,Il` butane lighter temp - Correct Answers 3,200 F
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Il` stick match temp - Correct Answers 3,000 F
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Il` cigarette temp - Correct Answers 500-800 F Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




Il` For complete combustion: air is ______ % oxygen + _____ % nitrogen - Correct Answers 20 : 80
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Il` for complete combustion, __(QTY)__ molecules of __(PART)___ need to be mixed with
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Il` ___(QTY)__ molecule of _____(PART)____ in the presence of __(PART)__ - Correct Answers 2
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Il` oxygen : 1 fuel : heat Il` Il` Il` Il` Il`




Il` When complete combustion happens __(4 things)___ are released - Correct Answers heat,
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Il` carbon dioxide (C02), water vapor (H20), and nitrogen (N)
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Il` Carbon monoxide is dangerous because (other than senseless) - Correct Answers it mixes with
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Il` blood and reduces oxygen carrying capacity
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Il` Aldehydes - Correct Answers chemical compounds that have a strong pungent odor
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Il` Carbon monoxide is ________ when aldehydes are present - Correct Answers present
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Il` Aldehydes result from - Correct Answers flame impingement and through the presence of
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Il` contaminated air Il`




Il` Efficiency formula - Correct Answers Heat output divided by heat input (percentage of heat
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Il` transferred to room) Il` Il`

, Il` 3 Ts of efficiency - Correct Answers Temperature, turbulence, time
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Il` Temperature (efficiency) - Correct Answers minimum ignition temp Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




Il` Turbulence (efficiency) - Correct Answers fuel must collide with oxygen molecules (refers to the
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Il` degree of fuel and air mixing that occurs in combustion zone)
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Il` Time (efficiency) - Correct Answers amount of time fuel gases remain in the high temp zone. also
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Il` known as "residence time" Il` Il` Il`




Il` Heat Transfer Efficiency - Correct Answers refers to the percentage of heat generated by
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Il` combustion actually transferred to room Il` Il` Il` Il`




Il` High heat transfer efficiency is normally associated with: (5 things) - Correct Answers Appliance
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Il` having proportionally large exterior surfaces with good heat radiating properties
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Long residence time of the hot gases in the Appliance
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Adequate turbulence inside the appliance to property transfer heat from the fire chamber to
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appliance walls
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Rapid heat transfer through the walls of the appliance
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Adequate air movement (convection) outside Il` Il` Il` Il`




Il` 2 types of factory built fireplaces - Correct Answers radiating and circulating
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