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upStationary Grade 3 Engineering License Exam questions & Solutions
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upStationary Grade 3 Engineering License Exam questions & Solutions
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upStationary Grade 3 EngineeringLicense Exam questions & Solutions
how can you loose your license? - -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? - -notify city hall if you change jobs,
address or retire
-why should you do rounds? - -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? - -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? - -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 - -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? - -the area of the boiler where COMPLETE
burning of the fuel occurs
-what is an internally fired boiler?
-----
,name 4 types - -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 - -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? - -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? - -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? - -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? - -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? - -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? - -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? - -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 - -it is an internally fired self contained horizontal return
firetube boiler.
-----
it is a cylindrical shell containing the combustion chamber and tubes that are
surrounded by water.
-how is a Stirling Boiler suspended? - -lugs on the ends of the upper drums
rest on the beams of its structure. the lower (MUD) drum is suspended from
the tubes and is free to move by expansion.
-describe the circulation of water within the Stirling Boiler - -feed water
enters the top rear drum, passes down the rear tubes to the mud drum.
steam and boiler water go up the front and center tubes to the front and
center drums. CIRCULATING TUBES allow boiler water to pass between the
drums. what does not go out as steam, goes back down the rear tubes.
-what provisions are made for tube removal on water boilers? - -1) some
tubes are left out
2) the tubes are staggered
3) sometimes, every other row is omitted
-What is a water tube boiler?
-----
list 5 advantages
-----
, list 5 disadvantages
-----
name 4 types - -in a water tube boiler, products of combustion pass around
tubes containing boiler water
-----
ADVANTAGES:
1) rapid steamers
2) use less water
3) less chance of explosion
4) no flat surfaces
5) smaller tube sizes
-----
DISADVANTAGES:
1) elaborate settings
2) field assembled
3) initial cost per pound of steam is higher
4) greater number of openings thus more air infiltration
5) require more floor space
-----
TYPES:
1) B.&W.
2) Stirling
3) Heine
4) "D" type
-what is a fire tube boiler?
-----
list 5 advantages
-----
list 5 disadvantages
-----
name 4 types - -in a fire tube boiler, products of combustion pass through
tubes or flues surrounded by water.
-----
ADVANTAGES:
1) very little setting required
2) factory assembled for fast installation
3) low initial cost
4) can be made portable
5) compact
-----
DISADVANTAGES:
1) slow steamers
2) limited in pressure and capacity
3) liable to disastrous explosions because drums and joints are set over the
fire
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