NFI Core - (final) questions with complete answers
already passed
1. Thee things needed for combustion: Air , fuel , and heat
2. Complete combustion produces these water vapor ( H2O ) carbon
four things: dioxide ( CO2 ) , heat ,
Nitrogen (N)
3. Incomplete combustion produces five things: carbon monoxide ,
hydrocarbons , and
other gasses , water , and
noncom- bustible ashes
4. Wood ignites between and F. 450 F and 550 F ,
5. BTU measurement of energy content. pound, cubic foot
Avail- able chemical energy per of
wood or of gas of fuel.
6. Natural gas ignites at F 1,150
7. Propane ignites to F 920-1,120
8. Heat Source Temperatures : Electric Spark ig- 1,700 F ,
nites at F
9. Hot Surface Igniter ignites at F 2,400 F ,
10. Butane Lighter ignites at F 3,200 F
11. A match ignites at F 3,000 F ,
12. Cigarettes ignites between 600 to F 600-800 F.
13. Oxygen is percent oxygen unaffect- ed by
and combustion
% nitrogen - nitrogen is
,NFI Core - (final) questions with complete answers
already passed
20 percent 80 % nitrogen
14. 200 parts
,NFI Core - (final) questions with complete answers
already passed
Nitrogen at parts of
carbon monoxide (CO) causes
headaches , fatigue dizziness
threatening strong pungent
organ, brain
15. Low level exposure over time are
cumulative and can include and
damage generalized depression
16. Symptoms of CO poisoning : flu-like
symp- toms , nausea , chronic
fatigue , and, ppm
.
17. ppm is an acceptable
level of carbon monoxide per ASHRAE
( CO )
18._______________PPM is the max continuous ex- 50
posure over 8 hours
19. PPM headaches 1-2 hours 400PPM, 3 hours (page 9)
Life threatening in hours
20. Efficiency = heat divided by output
heat input
21. What is infuenced by one or more of the three Eflciency
T's = temperature , turbulence , and
time ( page 11 )
22. Aldehydes = chemical compound strong pun- incomplete combustion
gent odor produced from
,NFI Core - (final) questions with complete answers
already passed
23. Residence time refers to the amount fuel gasses, combustion; high
of time remain in
the
temperature combustion zone
.
already passed
1. Thee things needed for combustion: Air , fuel , and heat
2. Complete combustion produces these water vapor ( H2O ) carbon
four things: dioxide ( CO2 ) , heat ,
Nitrogen (N)
3. Incomplete combustion produces five things: carbon monoxide ,
hydrocarbons , and
other gasses , water , and
noncom- bustible ashes
4. Wood ignites between and F. 450 F and 550 F ,
5. BTU measurement of energy content. pound, cubic foot
Avail- able chemical energy per of
wood or of gas of fuel.
6. Natural gas ignites at F 1,150
7. Propane ignites to F 920-1,120
8. Heat Source Temperatures : Electric Spark ig- 1,700 F ,
nites at F
9. Hot Surface Igniter ignites at F 2,400 F ,
10. Butane Lighter ignites at F 3,200 F
11. A match ignites at F 3,000 F ,
12. Cigarettes ignites between 600 to F 600-800 F.
13. Oxygen is percent oxygen unaffect- ed by
and combustion
% nitrogen - nitrogen is
,NFI Core - (final) questions with complete answers
already passed
20 percent 80 % nitrogen
14. 200 parts
,NFI Core - (final) questions with complete answers
already passed
Nitrogen at parts of
carbon monoxide (CO) causes
headaches , fatigue dizziness
threatening strong pungent
organ, brain
15. Low level exposure over time are
cumulative and can include and
damage generalized depression
16. Symptoms of CO poisoning : flu-like
symp- toms , nausea , chronic
fatigue , and, ppm
.
17. ppm is an acceptable
level of carbon monoxide per ASHRAE
( CO )
18._______________PPM is the max continuous ex- 50
posure over 8 hours
19. PPM headaches 1-2 hours 400PPM, 3 hours (page 9)
Life threatening in hours
20. Efficiency = heat divided by output
heat input
21. What is infuenced by one or more of the three Eflciency
T's = temperature , turbulence , and
time ( page 11 )
22. Aldehydes = chemical compound strong pun- incomplete combustion
gent odor produced from
,NFI Core - (final) questions with complete answers
already passed
23. Residence time refers to the amount fuel gasses, combustion; high
of time remain in
the
temperature combustion zone
.
