Minnesota Special Engineer Boiler License Exam 2025 New

Minnesota Special Engineer Boiler License Exam (2025 New Update) | Questions and Verified Answers| 100% Correct| Already Graded A what are the conditions necessary for good combustion?

• low sulfur content

b) Thermal, thermocoupler, tubular

• turbulence, temperature, time 3T's - ANSWER c) 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 - ANSWER 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 - ANSWER b) decreases 1 / 4

when pressure increases on steam from a given amount of water what happens to its temperature?

• increases
• decreases
• remains the same - ANSWER a) 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

• less "under the fire air" is required
• more "over the fire" air is needed
• less "over the fire" is needed less - ANSWER c) more "over the fire" air is

needed

excess air is an expression that refers to:

• overabundance of air
• theoretical amount of air
• air supplied above that theoretically required - ANSWER c) air supplied

above that theoretically required 2 / 4

a good percentage of carbon dioxide when burning oil is:

• 12%
• 8 %
• 10% - ANSWER a) 12%

what is draft on a boiler in operation?

a) Flow of gases through boiler

• difference in pressure between atmosphere and furnace or firebox
• difference between atmospheric pressure and breeching - ANSWER b)

difference in pressure between atmosphere and furnace or firebox which has greater heating value per pound?

• oil
• coal - ANSWER a) oil (18000 - 19500 BTU)

(coal has (6900 - 12910 BTU)) 3 / 4

heavy oil must be heated before entering the burner to:

• increase carbon content
• decreased sulfur content
• get proper atomization - ANSWER c) get proper atomization

why should a daily log be kept of flue gas temperature?

a) Valuable information in case of explosion

• superintendent files them
• change an operation, causing heat loss, can be detected - ANSWER c)

change an operation, causing heat loss, can be detected find SWP of a boiler 72 inches in diameter, thickness of one-half inch, tensile strength of 55,000 pounds, quadruple riveted butt and strap joint (.94) factor of

safety 5:

• 14.3
• 143.6
• 1436 - ANSWER b) 143.6

the total heat of steam is 1,188 BTUs, and feed water temperature is 182 degrees Fahrenheit. What is the factor of evaporation?

• / 4