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MN Boiler License /258 Questions And Answers (A+)
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MN Boiler License /258 Questions And Answers (A+)
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MN Boiler License 2023-2024 /258Questions And Answers (A+)
Quiz :what are the conditions necessary for good combustion?
a) low sulfur content
b) Thermal, thermocoupler, tubular
c) turbulence, temperature, time 3T's - √Answer :c) turbulence,
temperature, time 3T's
Quiz :why is secondary air necessary in hand fired boilers?
a) Necessary to burn the combustible gases
b) if primary air should fail
c) used only if sulfur content is high - √Answer :a) Necessary
to burn the combustible gases
Quiz :when pressure increases on steam from a given amount
of water what happens to its volume and latent heat?
a) increases
b) decreases
c) remains the same - √Answer :b) decreases
Quiz :when pressure increases on steam from a given amount
of water what happens to its temperature?
a) increases
b) decreases
c) remains the same - √Answer :a) increases
Quiz :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 - √Answer :c) more "over
the fire" air is needed
Quiz :excess air is an expression that refers to:
,a) overabundance of air
b) theoretical amount of air
c) air supplied above that theoretically required - √Answer :c)
air supplied above that theoretically required
Quiz :a good percentage of carbon dioxide when burning oil is:
a) 12%
b) 8 %
c) 10% - √Answer :a) 12%
Quiz :what is draft on a boiler in operation?
a) Flow of gases through boiler
b) difference in pressure between atmosphere and furnace or
firebox
c) difference between atmospheric pressure and breeching -
√Answer :b) difference in pressure between atmosphere and
furnace or firebox
Quiz :which has greater heating value per pound?
a) oil
b) coal - √Answer :a) oil (18000 - 19500 BTU)
(coal has (6900 - 12910 BTU))
Quiz :heavy oil must be heated before entering the burner to:
a) increase carbon content
b) decreased sulfur content
c) get proper atomization - √Answer :c) get proper atomization
Quiz :why should a daily log be kept of flue gas temperature?
a) Valuable information in case of explosion
b) superintendent files them
c) change an operation, causing heat loss, can be detected -
√Answer :c) change an operation, causing heat loss, can be
detected
,Quiz :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:
a) 14.3
b) 143.6
c) 1436 - √Answer :b) 143.6
Quiz :the total heat of steam is 1,188 BTUs, and feed water
temperature is 182 degrees Fahrenheit. What is the factor of
evaporation?
a) 107
b) 10.7
c) 1.07 - √Answer :c) 1.07
Quiz :why would viscosity be important in fuel oil?
a) more heat is recovered in water
b) has more volatile hydrocarbons
c) affects ease with which it can be handled - √Answer :c)
effects ease with which it can be handled
Quiz :why is too much air objectionable?
a) Cost too high
b) loss of efficiency
c) corrosive effect - √Answer :b) loss of efficiency
Quiz :what is a fyrite used for?
a) flue gas analyzer
b) combustion programmer
c) water analysis - √Answer :a) flue gas analyzer
Quiz :absolute pressure is (ABS):
a) atmospheric pressure - gauge pressure
b) gauge pressure minus atmospheric pressure
c) atmospheric pressure + gauge pressure - √Answer :c)
atmospheric pressure + gauge pressure
, Quiz :when pressure of steam increases, what happens to the
temperature?
a) Goes up
b) goes down
c) remains the same - √Answer :a) Goes up
Quiz :find the square feet of heating surface of a flu 4" in
diameter and 20' in length:
a) 25'sq
b) 251.32'sq
c) 2513'sq
d) 20.93'sq - √Answer :d) 20.93'sq
Quiz :what is the minimum size of the pipes connecting the
boiler to the water column?
a) 3/4 inch
b) 1 inch
c) 1/2 inch - √Answer :a) 3/4 inch
Quiz :why are crosses used instead of ells on water column
connections?
a) Cost less
b) has more strength
c) line may be easily cleaned - √Answer :c) line may be easily
cleaned
Quiz :can you have valves between boiler and water column?
a) Yes, if they are locked or sealed open
b) no, they might be closed accidentally
c) only if the boiler is under 100 horsepower - √Answer :a)
Yes, if they are locked or sealed open
Quiz :can you have valves between boiler and water column?
a) Yes, if they are locked or sealed open
b) no, they might be closed accidentally
c) only if the boiler is under 100 horsepower - √Answer :a)
Yes, if they are locked or sealed open
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