NFI Exam Review QUESTIONS WITH 100% CORRECT
ANSWERS Latest Edition Already Graded A+
Terms in this set (200)
Combustion Requirements (3) Air, Fuel, Heat
Complete Combustion Produces (4) Water vapor, carbon dioxide, heat, and non combustible ashes
incomplete combustion produces carbon monoxide, hydrocarbons, and other gases
(3)
rate at which fuel burns is the amount of available air
controlled by
air to fuel ratio is a critical factor in obtaining optimum fuel combustion
British Thermal Unit, The amount of energy needed to heat
BTU
one pound of water one degree Fahrenheit
wood ignites at 450-550 F
natural gas ignites at 1,150 F
propane ignites at 920-1120 F
electric spark temp 1,700 F
hot surface igniter temp 2,400 F
butane lighter temp 3,200 F
stick match temp 3,000 F
cigarette temp 500-800 F
For complete combustion: air is 20 : 80
_______________________%
oxygen +__% nitrogen
for complete combustion, 2 oxygen : 1 fuel : heat
__(QTY)__
molecules of __(PART)___ need to
be mixed with ___(QTY)__
molecule of _____(PART)
_________________________
in
the presence of __(PART)__
When complete combustion heat, carbon dioxide (C02), water vapor (H20), and nitrogen (N)
happens __(4 things)___ are
released
Carbon monoxide is dangerous it mixes with blood and reduces oxygen carrying capacity
because (other than senseless)
Aldehydes chemical compounds that have a strong pungent odor
, Carbon monoxide is__when present
aldehydes
are present
Aldehydes result from flame impingement and through the presence of contaminated air
Efficiency formula Heat output divided by heat input (percentage of heat transferred to room)
3 Ts of efficiency Temperature, turbulence, time
Temperature (efficiency) minimum ignition temp
fuel must collide with oxygen molecules (refers to the degree
Turbulence (efficiency)
of fuel and air mixing that occurs in combustion zone)
amount of time fuel gases remain in the high temp zone. also
Time (efficiency)
known as "residence time"
refers to the percentage of heat generated by combustion
Heat Transfer Efficiency
actually transferred to room
ANSWERS Latest Edition Already Graded A+
Terms in this set (200)
Combustion Requirements (3) Air, Fuel, Heat
Complete Combustion Produces (4) Water vapor, carbon dioxide, heat, and non combustible ashes
incomplete combustion produces carbon monoxide, hydrocarbons, and other gases
(3)
rate at which fuel burns is the amount of available air
controlled by
air to fuel ratio is a critical factor in obtaining optimum fuel combustion
British Thermal Unit, The amount of energy needed to heat
BTU
one pound of water one degree Fahrenheit
wood ignites at 450-550 F
natural gas ignites at 1,150 F
propane ignites at 920-1120 F
electric spark temp 1,700 F
hot surface igniter temp 2,400 F
butane lighter temp 3,200 F
stick match temp 3,000 F
cigarette temp 500-800 F
For complete combustion: air is 20 : 80
_______________________%
oxygen +__% nitrogen
for complete combustion, 2 oxygen : 1 fuel : heat
__(QTY)__
molecules of __(PART)___ need to
be mixed with ___(QTY)__
molecule of _____(PART)
_________________________
in
the presence of __(PART)__
When complete combustion heat, carbon dioxide (C02), water vapor (H20), and nitrogen (N)
happens __(4 things)___ are
released
Carbon monoxide is dangerous it mixes with blood and reduces oxygen carrying capacity
because (other than senseless)
Aldehydes chemical compounds that have a strong pungent odor
, Carbon monoxide is__when present
aldehydes
are present
Aldehydes result from flame impingement and through the presence of contaminated air
Efficiency formula Heat output divided by heat input (percentage of heat transferred to room)
3 Ts of efficiency Temperature, turbulence, time
Temperature (efficiency) minimum ignition temp
fuel must collide with oxygen molecules (refers to the degree
Turbulence (efficiency)
of fuel and air mixing that occurs in combustion zone)
amount of time fuel gases remain in the high temp zone. also
Time (efficiency)
known as "residence time"
refers to the percentage of heat generated by combustion
Heat Transfer Efficiency
actually transferred to room
