DC BOILER EXAM 2024-2025 ACTUAL EXAM
COMPLETE 240 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) |
ALREADY GRADED A+||ALREADY GRADED A+
Movingxbladingxinxwhichxspacexbetweenxbladesxisxthexsamexsizexatxthexbladingxinlet,xandxthexbladingx
outlet.x-xANSWERxImpulsexBlading
Toxblowdownxaxboilerxequippedxwithxaxquickxopeningxandxslowxopeningxvalvexonxthexbottomxblowdo
wnxline,xthe_________.x-xANSWERxquickxopeningxvalvexisxopenedxfirstxandxclosedxlast.
Hardnessxofxwaterxisxthexmeasurementxinxppmxofx________xandx________xinxthexwater.x-
xANSWERxcalciumxandxmagnesium
Axpumpxdeliversx175xgallonsxperxminutexagainstxaxpressurexofx55xpsi;xthexsuctionxpressurexisx15xpsi.xIf
xaxpumpxisx80%xefficient,xwhatxisxthexhorsepowerxneeded?x-
xANSWERxHP=5.1xHP=x(HeadxinxFeet)xxx(WeightxinxLbs.)/x33,000xxxEfficiency
axduplexxdouble-actingxreciprocatingxfeedxwaterxpumpxhas____x-
xANSWERxtwoxsteamxPistonsx2xtox2x2/2xtimesxlargerxinxareaxthanxthexwaterxpiston
Namexaxtechniquextoxcontrolxthexnitrousxoxidexemissions.x-xANSWERxSelectivexCatalyticxReduction
Spallingxinxaxboilerxoccursxinxthex____?x-xANSWERxCombustionxchamber
Axtechnologyxinxwhichxsolidxwastexisxheatedxinxanxoxygenxstarvedxatmospherextoxbreakxdownxthexsoli
dsxintoxaxgasxisxcalledx______?x-xANSWERxPyrolysis
, Whatxisxthexprimaryxpurposexofxusingxwetxscrubbers?x-xANSWERxToxremovexsulfurxdioxides
Thexthermalxefficiencyxofxaxboilerxwithxaxstackxtemperaturexofx750°Fxandxandxaxfurnacextemperaturex
ofx3200°Fxis_______?x-xANSWERx75%x((3200-750)/3200)xxx100
________isxaxwater-
purificationxprocessxinxwhichxthexwaterxtoxbextreatedxisxpressurizedxandxappliedxagainstxthexsurfacexof
xaxsemipermeablexmembrane.x-xANSWERxReversexosmosis
Thexairflowxswitchxatxthexburnerxfanxhousing______.x-
xANSWERxEnsuresxthexprimaryxairxfanxisxfunctioning
Howxmanyxinchesxofxsteamxspacexinxaxcylinderxofxanxenginex12"x28"xandxthexstrokexisx5/8xofxitsxfullxtr
avel?x-xANSWERx1978.xV=AxLxV=3.14(6x6)x28x.625=x1978
Whatxisxthexhorsepowerxrequirementxofxaxpumpxthatxmovesx2500xgpmxofxwaterxagainstxaxheadxofx47
5'xifxthexpumpxisxoperatingxatx58%xefficiency?x-xANSWERx516.8xHP=HeadxxxWeight/
33000xxxefficiency.x(Headx=475,xWeightx=x2500gpmxxx8.33)x(475xx20825)/19140
Ax______xisxthexconditionxthatxisxbeingxcontrolledx-xANSWERxprocessxvariable
Althoughxboilerxtubesxandxboilerxdrumsxwithstandxthexsamexpressure,xthexwallsxofxthexboilerxtubesxar
exmuchxthinnerxbecausex______.x-xANSWERxThextubesxarexmuchxsmallerxinxdiameter
Axleadxsulfidexcellxdetects_____.x-xANSWERxBurnerxpilotxandxmainxflame
WhichxofxthexfollowingxindicatesxaxmalfunctionxinxthexDCxheater?
x1.xThexboilerxrequiresxexcessivexamountsxofxoxygenxabsorbingxchemicals.
2.WaterxandxsteamxarexenteringxthexDCxheaterxatxthexsamextemperature.x-xANSWERxBothx1x&x2
COMPLETE 240 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) |
ALREADY GRADED A+||ALREADY GRADED A+
Movingxbladingxinxwhichxspacexbetweenxbladesxisxthexsamexsizexatxthexbladingxinlet,xandxthexbladingx
outlet.x-xANSWERxImpulsexBlading
Toxblowdownxaxboilerxequippedxwithxaxquickxopeningxandxslowxopeningxvalvexonxthexbottomxblowdo
wnxline,xthe_________.x-xANSWERxquickxopeningxvalvexisxopenedxfirstxandxclosedxlast.
Hardnessxofxwaterxisxthexmeasurementxinxppmxofx________xandx________xinxthexwater.x-
xANSWERxcalciumxandxmagnesium
Axpumpxdeliversx175xgallonsxperxminutexagainstxaxpressurexofx55xpsi;xthexsuctionxpressurexisx15xpsi.xIf
xaxpumpxisx80%xefficient,xwhatxisxthexhorsepowerxneeded?x-
xANSWERxHP=5.1xHP=x(HeadxinxFeet)xxx(WeightxinxLbs.)/x33,000xxxEfficiency
axduplexxdouble-actingxreciprocatingxfeedxwaterxpumpxhas____x-
xANSWERxtwoxsteamxPistonsx2xtox2x2/2xtimesxlargerxinxareaxthanxthexwaterxpiston
Namexaxtechniquextoxcontrolxthexnitrousxoxidexemissions.x-xANSWERxSelectivexCatalyticxReduction
Spallingxinxaxboilerxoccursxinxthex____?x-xANSWERxCombustionxchamber
Axtechnologyxinxwhichxsolidxwastexisxheatedxinxanxoxygenxstarvedxatmospherextoxbreakxdownxthexsoli
dsxintoxaxgasxisxcalledx______?x-xANSWERxPyrolysis
, Whatxisxthexprimaryxpurposexofxusingxwetxscrubbers?x-xANSWERxToxremovexsulfurxdioxides
Thexthermalxefficiencyxofxaxboilerxwithxaxstackxtemperaturexofx750°Fxandxandxaxfurnacextemperaturex
ofx3200°Fxis_______?x-xANSWERx75%x((3200-750)/3200)xxx100
________isxaxwater-
purificationxprocessxinxwhichxthexwaterxtoxbextreatedxisxpressurizedxandxappliedxagainstxthexsurfacexof
xaxsemipermeablexmembrane.x-xANSWERxReversexosmosis
Thexairflowxswitchxatxthexburnerxfanxhousing______.x-
xANSWERxEnsuresxthexprimaryxairxfanxisxfunctioning
Howxmanyxinchesxofxsteamxspacexinxaxcylinderxofxanxenginex12"x28"xandxthexstrokexisx5/8xofxitsxfullxtr
avel?x-xANSWERx1978.xV=AxLxV=3.14(6x6)x28x.625=x1978
Whatxisxthexhorsepowerxrequirementxofxaxpumpxthatxmovesx2500xgpmxofxwaterxagainstxaxheadxofx47
5'xifxthexpumpxisxoperatingxatx58%xefficiency?x-xANSWERx516.8xHP=HeadxxxWeight/
33000xxxefficiency.x(Headx=475,xWeightx=x2500gpmxxx8.33)x(475xx20825)/19140
Ax______xisxthexconditionxthatxisxbeingxcontrolledx-xANSWERxprocessxvariable
Althoughxboilerxtubesxandxboilerxdrumsxwithstandxthexsamexpressure,xthexwallsxofxthexboilerxtubesxar
exmuchxthinnerxbecausex______.x-xANSWERxThextubesxarexmuchxsmallerxinxdiameter
Axleadxsulfidexcellxdetects_____.x-xANSWERxBurnerxpilotxandxmainxflame
WhichxofxthexfollowingxindicatesxaxmalfunctionxinxthexDCxheater?
x1.xThexboilerxrequiresxexcessivexamountsxofxoxygenxabsorbingxchemicals.
2.WaterxandxsteamxarexenteringxthexDCxheaterxatxthexsamextemperature.x-xANSWERxBothx1x&x2
