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upStationary Grade 3 Engineering License fully solved & verified actual exam(download to pass).
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upStationary Grade 3 Engineering License fully solved & verified actual exam(download to pass).
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upStationary Grade 3 EngineeringLicense fully solved & verified
actual exam(download to pass)
how can you loose your license? - answer 1) drinking on the job
2) sleeping on the job
3) negligence
4) unsafe work
5) signing a falsified license application for someone
6) failing to renew your license annually
what must you do if you change jobs? - answer notify city hall if
you change jobs, address or retire
why should you do rounds? - answer Find and correct problems to
prevent breakdowns. keeping permanent records will make it easy
to forecast most breakdowns because you will get to know
equipment
what is a steam boiler? - answer closed vessel, PARTIALLY FILLED
WITH WATER, under pressure that transforms water to steam with
the application of heat.
what are the requirements of a good boiler? - answer 1) simple
2) designed to accommodate expansion and contraction
3) adequate steam and water space
4) efficient
5) responsive to demands
6) accessible for cleaning and repairs
,7) safe
Name and describe 3 types of heat transfer used in boiler operation
- answer 1) RADIANT HEAT - transmitted from hot body to a cold
body by means of direct radiation (heat from sun reaches us by
radiation)
2) CONDUCTION - physical contact (coffee cup is heated by
conduction when hot coffee touches the cup)
3) CONVECTION - carried along by a moving part such as air or water
(your living room is heated by warm air from your furnace in
another location
what is a combustion chamber? - answer the area of the boiler
where COMPLETE burning of the fuel occurs
what is an internally fired boiler?
-----
name 4 types - answer those in which the grate and combustion
chamber are enclosed within the boiler shell.
-----
1) Scotch marine
2) Vertical firetube
3) Locomotive
4) Cast iron package boiler
what is an externally fired boiler
-----
name 4 types - answer the setting, including the furnace and
grates is separate and distinct from the boiler shell.
,-----
1) horizontal return tubular (HRT) set in brick
2) some watertube
3) cast iron set in brick
4) Stirling boiler
5) Heine boiler
what is a crown sheet and its purpose?
-----
what is a tube sheet and its purpose? - answer in a vertical
firetube boiler holds the tubes and is thicker because it is exposed
to the fire.
-----
holds the tubes and does not see the fire
what is a waterleg on a boiler? - answer space between the outer
shell and the furnace containing boiler water. it absorbs heat that
would be wasted and increases the capacity of the boiler. the
surfaces are flat and must be stayed.
is an HRT Boiler set level or inclined and why?
-----
are HRT Boiler tubes set level or inclined and why? - answer
INCLINED 1-3" front to rear to permit drainage and removal of water
impurities
-----
INCLINED with the boiler
Name 2 way to support and take care of expansion of an HRT Boiler
-----
, Which way is best? - answer 1) Suspended from hangars and
supported by overhead beams
2) Set on saddles equipped with rollers to permit movement of the
boiler as it expands and contracts
-----
Suspended from hangars and supported by overhead beams is best
because it works no hardship on the furnace walls
what is a longitudinal joint?
-----
what is a circumferential joint? - answer LONGITUDINAL JOINT =
seam running the length of the shell and is butt strap construction
or fusion welded. it is above the fireline to avoid overheating.
-----
CIRCUMFERENTIAL JOINT = lap joint running the circumference of
the drum
what is the difference between a flue and a tube? - answer 1) Flue -
4" or more in diameter measured internally
2) Tube - 4" or less in diameter measured externally
what is a drypipe and where is it located? - answer a steam
separator located within the boiler shell and connected to the steam
outlet. its upper surface is perforated. steam enters the
perforations rapidly changing its direction of flow causing droplets
and impurities to separate from the steam before entering the
steam outlet.
describe a Scotch Marine Boiler?
-----
how it is fired - answer it is an internally fired self contained
horizontal return firetube boiler.
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