MM ADVANCEMENT STUDY GUIDE 2
EXAM QUESTIONS WITH RIGHT
ANSWERS |LATEST UPDATE .
what portion of the steam drum contains a manhole for access to the drum for cleaning, inspecting,
and repair? - Correct Answer -drumhead
which tubes at high - Correct Answer -downcomers
what boiler component preheats the feed water prior to its entering the steam drum? - Correct
Answer -economizer
what function do the metal projections on the economizer tubes serve? - Correct Answer -to extend
the heat transfer surface of the tubes
what is the heating source of the economizer? - Correct Answer -Combustion gases
what is the standard size of firebrick? - Correct Answer -2 1/2x4 1/2 x 9
insulating block is capable of withstanding surface temps of? - Correct Answer -1500 F
What joins the boiler to the smoke pipe? - Correct Answer -uptakes
Refractory expansion joints are normally what size? - Correct Answer -1/4"
what is preferred material for expansion joint construction? - Correct Answer -styrofoam
A boiler must always be purged in accordance with what? - Correct Answer -purge table
During a furnace inspection prior to light off the boiler inspection device (bid) fogs up, what is the
probable cause? - Correct Answer -presence of fuel oil in the furnace
1
,Can raw fuel be removed from the furnace by purging the boiler? - Correct Answer -no, the fuel must
be wiped up
Once a boiler purge is complete, fires must be lighted within what time frame? - Correct Answer -5
mins
If ignition fails to occur within 2 to 3 seconds what action must be taken? - Correct Answer -shut the
burner fuel oil manifold valve, safety shut off device and investigate the cause
During a heavy black smoke condition the burner flame will be what color? - Correct Answer -dark
orange
an incandescent dazzling white burner flame is an indication of what? - Correct Answer -excessive air
Fuel oil temperature at the burner front shall not exceed what temperature? - Correct Answer -125 F
what is the function of the boiler sliding feet? - Correct Answer -to allow for expansion and
contraction of the boiler during light off and cool down
the steam separators separate the steam and water mixture by what action? - Correct Answer -
centrifugal action
The majority of the steam that leaves the superheater goes where? - Correct Answer -main engines
a short term decrease in drum water level which results from a change in firing rate or steam flow
without any corresponding change In the feeding rate is termed what? - Correct Answer -shrink
the amount of heat applied to steam to raise its temp above the saturation temp, while maintaining
constant pressure is defined as? - Correct Answer -superheat
what is the basic cause of all boiler explosions? - Correct Answer -The accumulation of unburned fuel
or combustion vapors at some point in the system
2
,Steam soot blower elements are rotated at a rate of? - Correct Answer -10 to 15 secs per 90 degrees
rotation
Minimum steam atomization temp at the burner front is what? - Correct Answer -370 F
the desired range of steam atomization temp is? - Correct Answer -400 +/- 10
what prevents windmilling of an idle force draft blower, while the other force draft blower is online?
- Correct Answer -automatic shutters
The chock facing of the sliding feet is constructed of what material? - Correct Answer -phosphorus
bronze
what term is usually attributable to deficiency of air and excessive vibration of the boiler? - Correct
Answer -panting
heavy and prolonged seawater contamination of the fuel oil will form what type of corrosive
products on the brick work? - Correct Answer -slag formation
what function does nichrome wire serve in the refractory? - Correct Answer -as an anchoring device
A boiler that provides some means of controlling the degree of superheat independently of the rate
of steam generation is said to have? - Correct Answer -controlled superheat
most modem naval boilers are designed for what type of circulation? - Correct Answer -accelerated
natural circulation
what is the function of refractory material? - Correct Answer -to confine the heat to the firebox and
protect the casing and structural members from overheating
what are the three endpoints a steaming boiler has? - Correct Answer -circulation, moisture
carryover, and combustion
how are individual economizer tubes connected? - Correct Answer -By U-Bends at the tube ends
3
, what type of refractory is preferred for small repairs or where standard size brick or tile cannot be
used? - Correct Answer -castable fireclay
Castable refractory must be air cured for how long prior to baking out? - Correct Answer -two days
What type of tile is made of silicon carbide ? - Correct Answer -Baffle tile
who determines the combination of boilers and burners to be used, that gives the greatest plant
efficiency with due regard to providing for safety and military requisites? - Correct Answer -
engineering officer
When warming up steam assisted atomizers, how long do you allow for warmup with steam prior to
light off? - Correct Answer -3 to 5 mins
when using compressed air for light off, what is the required pressure of the compressed air? -
Correct Answer -85 to 150 psig
where can guidance and general info on all naval boilers be found? - Correct Answer -NSTM 221
what component reduces the steam temp of saturated stream in the 150 psig steam system? -
Correct Answer -in-line desuperheater
Is it allowable to use shore steam for steam atomization ? - Correct Answer -no, due to its poor
quality
the torch man shall wear what PPE, during boiler light off? - Correct Answer -coveralls, eye shield,
and bumerman gloves
During boiler light off what rule must always be followed ? - Correct Answer -two man rule
on a D-type boiler with an integtral superheater, what protects the superheater from overheating
during the initial steam formation? - Correct Answer -superheater protection steam (shps)
4
EXAM QUESTIONS WITH RIGHT
ANSWERS |LATEST UPDATE .
what portion of the steam drum contains a manhole for access to the drum for cleaning, inspecting,
and repair? - Correct Answer -drumhead
which tubes at high - Correct Answer -downcomers
what boiler component preheats the feed water prior to its entering the steam drum? - Correct
Answer -economizer
what function do the metal projections on the economizer tubes serve? - Correct Answer -to extend
the heat transfer surface of the tubes
what is the heating source of the economizer? - Correct Answer -Combustion gases
what is the standard size of firebrick? - Correct Answer -2 1/2x4 1/2 x 9
insulating block is capable of withstanding surface temps of? - Correct Answer -1500 F
What joins the boiler to the smoke pipe? - Correct Answer -uptakes
Refractory expansion joints are normally what size? - Correct Answer -1/4"
what is preferred material for expansion joint construction? - Correct Answer -styrofoam
A boiler must always be purged in accordance with what? - Correct Answer -purge table
During a furnace inspection prior to light off the boiler inspection device (bid) fogs up, what is the
probable cause? - Correct Answer -presence of fuel oil in the furnace
1
,Can raw fuel be removed from the furnace by purging the boiler? - Correct Answer -no, the fuel must
be wiped up
Once a boiler purge is complete, fires must be lighted within what time frame? - Correct Answer -5
mins
If ignition fails to occur within 2 to 3 seconds what action must be taken? - Correct Answer -shut the
burner fuel oil manifold valve, safety shut off device and investigate the cause
During a heavy black smoke condition the burner flame will be what color? - Correct Answer -dark
orange
an incandescent dazzling white burner flame is an indication of what? - Correct Answer -excessive air
Fuel oil temperature at the burner front shall not exceed what temperature? - Correct Answer -125 F
what is the function of the boiler sliding feet? - Correct Answer -to allow for expansion and
contraction of the boiler during light off and cool down
the steam separators separate the steam and water mixture by what action? - Correct Answer -
centrifugal action
The majority of the steam that leaves the superheater goes where? - Correct Answer -main engines
a short term decrease in drum water level which results from a change in firing rate or steam flow
without any corresponding change In the feeding rate is termed what? - Correct Answer -shrink
the amount of heat applied to steam to raise its temp above the saturation temp, while maintaining
constant pressure is defined as? - Correct Answer -superheat
what is the basic cause of all boiler explosions? - Correct Answer -The accumulation of unburned fuel
or combustion vapors at some point in the system
2
,Steam soot blower elements are rotated at a rate of? - Correct Answer -10 to 15 secs per 90 degrees
rotation
Minimum steam atomization temp at the burner front is what? - Correct Answer -370 F
the desired range of steam atomization temp is? - Correct Answer -400 +/- 10
what prevents windmilling of an idle force draft blower, while the other force draft blower is online?
- Correct Answer -automatic shutters
The chock facing of the sliding feet is constructed of what material? - Correct Answer -phosphorus
bronze
what term is usually attributable to deficiency of air and excessive vibration of the boiler? - Correct
Answer -panting
heavy and prolonged seawater contamination of the fuel oil will form what type of corrosive
products on the brick work? - Correct Answer -slag formation
what function does nichrome wire serve in the refractory? - Correct Answer -as an anchoring device
A boiler that provides some means of controlling the degree of superheat independently of the rate
of steam generation is said to have? - Correct Answer -controlled superheat
most modem naval boilers are designed for what type of circulation? - Correct Answer -accelerated
natural circulation
what is the function of refractory material? - Correct Answer -to confine the heat to the firebox and
protect the casing and structural members from overheating
what are the three endpoints a steaming boiler has? - Correct Answer -circulation, moisture
carryover, and combustion
how are individual economizer tubes connected? - Correct Answer -By U-Bends at the tube ends
3
, what type of refractory is preferred for small repairs or where standard size brick or tile cannot be
used? - Correct Answer -castable fireclay
Castable refractory must be air cured for how long prior to baking out? - Correct Answer -two days
What type of tile is made of silicon carbide ? - Correct Answer -Baffle tile
who determines the combination of boilers and burners to be used, that gives the greatest plant
efficiency with due regard to providing for safety and military requisites? - Correct Answer -
engineering officer
When warming up steam assisted atomizers, how long do you allow for warmup with steam prior to
light off? - Correct Answer -3 to 5 mins
when using compressed air for light off, what is the required pressure of the compressed air? -
Correct Answer -85 to 150 psig
where can guidance and general info on all naval boilers be found? - Correct Answer -NSTM 221
what component reduces the steam temp of saturated stream in the 150 psig steam system? -
Correct Answer -in-line desuperheater
Is it allowable to use shore steam for steam atomization ? - Correct Answer -no, due to its poor
quality
the torch man shall wear what PPE, during boiler light off? - Correct Answer -coveralls, eye shield,
and bumerman gloves
During boiler light off what rule must always be followed ? - Correct Answer -two man rule
on a D-type boiler with an integtral superheater, what protects the superheater from overheating
during the initial steam formation? - Correct Answer -superheater protection steam (shps)
4
