Exam (elaborations)
POWER ENGINEERING TECHNOLOGY (PET YR 1): 4B POWER BOILERS EXAM
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POWER ENGINEERING TECHNOLOGY (PET YR 1): 4B POWER BOILERS EXAM
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POWER ENGINEERING TECHNOLOGY(PET YR 1): 4A HIGH PRESSURE
BOILERS EXAM
A6characteristic6that6made6early6boilers6very6inefficient6was:
a.6small6heating6surface
b.6an6excess6of6flat6surfaces
c.6the6internal6furnace
d.6lack6of6good6quality6fuels6-6ans--a
A6hot6water6boiler6is6considered6a6high6temperature6water6boiler6when:
a.6it's6design6pressure6is6less6than61100kPa
b.6it's6operating6temperature6is6greater6than61206degrees6celsius6
c.6it's6operating6temperature6is6less6than61206degrees6celsius6
d.6it's6energy6input6exceeds658.7kW6-6ans--b
The6Haycock6boiler6was:
a.6a6watertube6design
b.6a6return6tubular6design
c.6used6around61720
d.6of6welded6construction6-6ans--c
The6steam6space6of6a6boiler6must6be6large6enough6to:
a.6keep6the6steam6pressure6down
b.6reduce6the6cooling6effect6of6water
c.6allow6the6steam6to6rise6from6the6surface6of6the6water
d.6accommodate6all6the6steam6riser6tubes6-6ans--c
The6boiler6term6"drum"6commonly6refers6to6the6pressure6container6of6a6watertube6boiler,6
whereas6the6term6"_______"6commonly6refers6to6the6pressure6vessel6of6a6firetube.
a.6vessel
b.6shell
c.6tank
d.6cylinder6-6ans--b
An6internally6fired6boiler:
a.6is6less6efficient6than6an6externally6fired6unit
b.6utilized6a6high6amount6of6refractory6and/or6firebrick
,c.6has6the6furnace6surrounded6by6water
d.6requires6a6setting6-6ans--c
Packaged6boilers:
a.6are6shipped6in6a6packing6case6with6the6components6disassembled
b.6are6completely6factory-built
c.6must6not6be6used6over6100kPa6working6pressure
d.6have6risers6and6downcomers6-6ans--b
In6a6bottom-supported6boilers,6the6steam6drum6is6usually:
a.6supported6by6an6overhead6girder6arrangement6
b.6supported6by6the6water6tubes
c.6supported6by6the6piers
d.6placed6between6the6centre6line6of6the6unit6-6ans--b
When6part6of6firetube6boilers,6heads6are6commonly6called6what?
a.6heads
b.6tube6sheets
c.6plates
d.6end6plates6-6ans--b
Boiler6manholes6are6openings6through6which6a6person6can:
a.6enter6the6boiler6furnace
b.6inspect6the6boiler6uptake
c.6inspect,6maintain6or6repair6internal6parts6of6a6boiler
d.6enter6and6inspect6the6steam6header6-6ans--c
Handhold6and6manhole6openings:
a.6permit6inspection,6cleaning6and6repairs
b.6require6a6cast6iron6reinforcing6ring
c.6are6not6required6on6low6pressure6hot6water6boilers
d.6are6required6on6high6pressure6boilers6only6-6ans--a
A6force6that6holds6the6manway6doors6of6the6boiler6drums6in6place6during6operation6is6the:
a.6bolting6force
b.6force6on6the6yoke
c.6boiler6pressure
d.6strength6of6the6welds6-6ans--c
Beading6the6tube6ends6in6a6firetube6boiler:
a.6stops6tube6leakage
b.6eliminates6the6need6to6expand6the6tubes6into6the6tube6sheet
c.6helps6prevent6overheating6of6the6tube6ends
d.6must6be6followed6by6seal6welding6-6ans--c
Firetube6boilers6have6their6tubes6fixed6into6flat6steel6plates6known6as:
,a.6shells
b.6drums
c.6headers
d.6tube6sheets6-6ans--d
Manholes6are:
a.6installed6on6all6boilers
b.6provides6for6inspection6purposes
c.6always6circular6in6shape
d.6installed6on6fossil6fired6boilers6only6-6ans--b
A6_______6is6a6water6filled6section,6which6surrounds6the6firebox6in6a6locomotive6boiler.
a.6Crown6sheet
b.6boiler6drum
c.6steam6done
d.6water6leg6-6ans--d
A6firetube6boiler6is6one6that6has:
a.6water6on6the6inside6of6the6tubes6and6hot6gas6on6the6outside
b.6the6furnace6as6the6first6pass6of6the6burner6flame
c.6water6on6the6outside6of6the6tubes6and6hot6water6on6the6inside6of6the6tubes6
d.6water6on6the6outside6of6the6tubes6and6hot6gas6on6the6inside6of6the6tubes6-6ans--d
A6water6leg6is6found6on6a/an6_______6boiler.
a.6scotch
b.6watertube
c.6locomotive
d.6HRT6-6ans--c
When6the6hot6combustion6gases6travel6through6boiler6tubes6which6are6surrounded6by6bo
iler6water6in6the6boiler6is6called6a:
a.6watertube6boiler
b.6tubular6boiler
c.6coil6type6boiler6
d.6firetube6boiler6-6ans--d
With6regard6to6a6steam6boiler,6the6lettering6"HRT"6means:6
a.6highly6regulated6temperature
b.6hot6return6tubes
c.6horizontal6return6tubular
d.6horizontal6receiver6tubes6-6ans--c
An6advantage6of6a6vertical6tubeless6firetube6boiler6is6that6it6requires:
a.6relatively6small6floor6space
b.6no6fuel6handling6equipment
c.6less6fuel6for6combustion
, d.6very6little6water6treatment6-6ans--a
The6passage6of6combustion6gases6along6the6length6of6the6boiler6is6referred6to6as6a:
a.6stack6pass
b.6combustion6gas6pass
c.6combustion6air6pass
d.6chimney6pass6-6ans--b
A6corrugated6furnace6will6give6required6strength6with6thinner6metal,6increases6heating6su
rface,6and:
a.6increase6the6boiler6mass
b.6add6to6the6overall6material6cost6of6the6unit
c.6decrease6combustion6turbulence
d.6allow6for6differential6expansion6and6contraction6-6ans--d
Corrugated6furnaces:
a.6permit6expansion6and6contraction6with6reduced6stress
b.6are6cheaper6than6plain6furnaces
c.6are6made6from6rolled6copper
d.6require6fewer6stays6than6plain6furnaces6-6ans--a
Boiler6stays:
a.6are6used6to6support6flat6surfaces6in6a6boiler
b.6are6mostly6used6in6watertube6boilers
c.6have6to6be6replaced6every626years
d.6secure6a6boiler6to6its6foundation6-6ans--a
A6watertube6boiler6is6a6boiler6in6which:
a.6water6passes6through6the6tubes
b.6air6passes6through6the6tubes
c.6water6passes6around6the6tubes
d.6combustion6gases6pass6through6the6tubes6-6ans--a
Bent6tube6watertube6boilers:
a.6cannot6have6the6furnace6water-lined
b.6furnaces6are6lined6with6water6tubes6to6absorb6more6radiant6head6from6the6fire
c.6are6externally6fired
d.6cannot6be6fitted6with6heat6recovery6components6-6ans--b
A6cyclone6separator6in6a6boiler6steam6drum:
a.6removes6moisture6from6steam,6using6centrifugal6force
b.6causes6impurities6to6be6thrown6from6the6boiler6water
c.6is6located6at6the6superheater6outlet
d.6discharged6water6into6the6scrubbers6-6ans--a
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