MN Boiler License Questions Actual Exam

MN Boiler License Questions / Actual Exam Questions & Correct, Certified Solutions / 2025 / 2026.Terms in this set (258) a questionan answer what are the conditions necessary for good combustion?

• low sulfur content

b) Thermal,

thermocoupler, tubular

• turbulence,

temperature, time 3T's

• turbulence, temperature, time 3T's

why is secondary air necessary in hand fired boilers?

a) Necessary to burn the

combustible gases

• if primary air should fail
• used only if sulfur

content is high

a) Necessary to burn the combustible gases

when pressure increases on steam from a given amount of water what happens to its volume and latent heat?

• increases
• decreases
• remains the same
• decreases 1 / 4

when pressure increases on steam from a given amount of water what happens to its temperature? a) increases b)decreases c)remains the same

• increases

when carbon monoxide (co) is formed and carbon dioxide (co2) is very high what does it generally signify?a)More "under the fire air"is needed b)less "under the fire air"is required c)more "over the fire" air is needed d)less "over the fire" is needed less

• more "over the fire" air is needed

excess air is an expression

that refers to:

a)overabundance of air b)theoretical amount ofair c)air supplied above thattheoretically required

• air supplied above that theoretically required

a good percentage of carbon dioxide when

burning oil is: a) 12%

b)8 % c)10%

• 12% 2 / 4

what is draft on a boiler in operation?a)Flow of gases throughboiler b)difference in pressurebetween atmosphere and furnace or firebox c)difference betweenatmospheric pressure and breeching

• difference in pressure between atmosphere and furnace or

firebox which has greater heating value per pound?a)oil b)coal

• oil (18000 - 19500 BTU) (coal

has (6900 - 12910 BTU)) heavy oil must be heated before entering the burner

to:

a)increase carboncontent b)decreased sulfurcontent c)get proper atomization

• get proper atomization

why should a daily log be kept of flue gas temperature?a)Valuable information incase of explosion b)superintendent filesthem c)change an operation,causing heat loss, can be detected

• change an operation, causing heat loss, can be detected 3 / 4

• / 4