STATIONARY ENGINEER EXAM QUESTIONS AND ANSWERS

STATIONARY ENGINEER EXAM
QUESTIONS AND ANSWERS
Howf4muchf4clearancef4fromf4thef4topf4off4thef4boilerf4isf4neededf4forf4af4HPf4boilerf4thatf4pr
oducesf470000f4lbsf4off4steam?f4-f4ANSWERS--7f4feet

Onf4af4gasf4firedf4boilerf4whatf4isf4thef4properf4gasf4tof4airf4mixturef4-f4ANSWERS--30%-
70%f4and

inf4specialf4arrangementsf4itf4canf4bef4asf4highf4asf4100%f4.f4ANSWERf4CHAPTERf411f4re
f4

member%

Whatf4isf4thef4totalf4hardnessf4inf4af4systemf4thatf4wasf4foundf4tof4havef4calciumf4hardnessf
4off460ppmf4andf4magnesiumf4hardnessf4off418ppmf4andf4carbonf4hardnessf4off412f4ppm?

f4-f4ANSWERS--TH=(Caf4xf42.5)f4+f4(Mgf4xf44.1)\nTH=(60f4xf42.5)f4+f4(18f4xf44.1)\

nTH=f4150+73.8f4=(f4223.8f4PPM)

Howf4oftenf4shouldf4af4completef4externalf4inspectionf4off4thef4boilerf4bef4done?f4-
f4ANSWERS--Oncef4af4Shift



Withf424f4hrf4operationf4howf4oftenf4dof4youf4checkf4thef4waterf4level?f4-f4ANSWERS--
Oncef4perf4shift

Howf4oftenf4dof4youf4checkf4thef4LWCO?f4-f4ANSWERS--Oncef4perf4shift

Howf4oftenf4dof4youf4checkf4thef4Highf4Limitf4Switch?f4-f4ANSWERS--Annually

Af42"f4pipef4wasf4foundf4tof4bef4deliveringf4waterf4atf4100f4psiaf4atf41040ftf4perf4second.f4Ho
wf4manyf4gallonsf4perf4hourf4willf4itf4deliver?f4-f4ANSWERS--
GPM=f4Vf4(diameterf4squared)f4dividedf4byf4.4085f4ANSWERf4pgf4469f4BOG

Whatf4controlsf4thef4amountf4off4blowbackf4onf4af4safetyf4valve?f4-f4ANSWERS--
Blowbackf4ringf4orf4adjustingf4ring

Onf4af4openf4airf4expansionf4tankf4hotf4waterf4boilerf4system;f4howf4highf4shouldf4itf4bef4mo
unted?f4-f4ANSWERS--(4f4Feetf4)f4abovef4thef4highestf4heatingf4element.

Whatf4isf4thef4minimumf4topf4clearancef4off4boilersf4withf4manholes?f4-f4ANSWERS--
5f4feet

Packagef4boilers;f4steamf4heatingf4boilersf4andf4hotf4waterf4heatingf4boilersf4shallf4havef4a
f4minimumf4clearancef4of?f4-f4ANSWERS--

2f4feetf4fromf4ceiling.f4Codef4chapterf410f4page76

Mostf4importantf4safetyf4devicef4onf4af4boiler?f4-f4ANSWERS--Safetyf4relieff4valve

,Whatf4doesf4af4Blackf4Liquorf4Boilerf4do?f4-f4ANSWERS--
Blackf4Liquorf4isf4thef4byf4productf4off4woodf4pulpf4processingf4inf4thef4paperf4makingf4indu
stry.

Whatf4doesf4Blackf4liquorf4boilerf4knownf4for?f4-f4ANSWERS--
Steamf4generationf4andf4recoveryf4off4sodaf4ash

Maximumf4linef4voltagef4forf4controlf4onf4af4boiler?f4-f4ANSWERS--150f4volts

Underf4whatf4codef4aref4boilersf4designedf4andf4constructed?f4-f4ANSWERS--ASME-
f4CSDf41



Howf4manyf4lowf4waterf4cutf4offsf4aref4neededf4perf4codef4forf4af4hotf4waterf4systemf4whenf4
af4boilerf4hasf4inputsf4greaterf4thanf4400,000f4btuf4perf4hrf4-f4ANSWERS--
1f4LWCOf4isf4needed.

Whatf4isf4thef4minimumf4andf4maximumf4sizef4forf4af4safetyf4valvef4perf4codef4forf4boilers?
f4-f4ANSWERS--Minimumf43/4"f4andf4Maximumf44f41/2"



Whatf4stampf4isf4putf4onf4af4boilerf4afterf4repairs?f4-f4ANSWERS--"R"

Whatf4isf4thef4equalizingf4systemf4usedf4for?f4-f4ANSWERS--
Thef4equalizingf4systemf4isf4forf4warmingf4upf4thef4steamf4lead.

Af4blowdownf4valvef4isf4locatedf4atf4thef4lowestf4waterf4spacef4off4af4boilerf4forf4threef4purp
osesf4-f4ANSWERS--1.f4tof4removef4precipitatedf4sludgef4orf4loosef4scalef4\
n2.f4Tof4permitf4rapidf4loweringf4off4thef4boilerf4waterf4iff4itf4hasf4becomef4toof4highf4acciden
tallyf4\
n3.f4Asf4af4meansf4off4removingf4waterf4fromf4thef4boilerf4sof4thatf4freshf4waterf4mayf4bef4ad
dedf4tof4keepf4thef4concentrationf4off4solidsf4belowf4thef4pointf4wheref4difficultiesf4mayf4bef4
experienced.

Inf4thef4oldf4powerf4boilerf4whichf4typef4off4feed-waterf4regulatorsf4weref4notf4used?f4-
f4ANSWERS--Electronic



Afterf4openingf4af4boilerf4forf4repairsf4howf4muchf4oxygenf4isf4needed?f4-f4ANSWERS--
19%

Whatf4isf4thef4firstf4thingf4youf4dof4whenf4shuttingf4downf4af4boiler?f4-f4ANSWERS--
Turnf4offf4(extinguishf4fire)

Whatf4isf4thef4legalf4limitf4off4acceptablef4asbestosf4particlesf4?f4-f4ANSWERS--
0.1f4fibersf4perf4cubicf4centimeter

Whatf4isf4CREEP?f4-f4ANSWERS--
Creepf4isf4definedf4asf4thef4slowf4deformationf4off4materialf4withf4time;f4withf4thef4deformati
onf4takingf4placef4atf4elevatedf4temperaturesf4withf4nof4increasef4inf4stress.

Whatf4isf4thef4BTUf4contentf4off4Anthracitef4coal?f4-f4ANSWERS--14000f4btu/lb

,Whatf4substancef4transfersf4electricalf4currentf4inf4af4photocell?f4-f4ANSWERS--
Electricityf4willf4flowf4whenf4thef4CADMIUMf4isf4exposedf4tof4sufficientf4light.

Whatf4devicef4actsf4asf4af4checkf4valvef4inf4bothf4directionsf4andf4keepsf4pumpsf4primed?
f4-f4ANSWERS--

FOOTf4VALVESf4aref4usedf4forf4pumpsf4underf4suctionf4pressuref4tof4preventf4backflowf4
primed?f4onf4thef4suctionf4line.

Whatf4protectsf4boilersf4fromf4explosionf4inf4thef4furnace?f4-f4ANSWERS--
Af4flamef4guardf4systemf4isf4anf4arrangementf4off4flamef4detectionf4system;f4interlocks;f4a
ndf4relaysf4whichf4willf4sensef4thef4presencef4off4af4properf4flamef4inf4af4furnacef4andf4caus
ef4fuelf4tof4bef4shutf4offf4tof4thef4furnacef4iff4af4hazardousf4conditionf4developsf4(improperf4fl
amef4orf4combustion).

Whatf4sizef4pipef4isf4usedf4asf4af4headerf4inf4af4boilerf4operatingf4atf4100psi?f4-
f4ANSWERS--6f4inches



Whatf4devicef4isf4usedf4tof4measuref4fluef4gassesf4-f4ANSWERS--Thef4Orsatf4Analyzer

Whichf4lowf4waterf4cutf4offf4doesf4notf4havef4af4mercuryf4switch?f4-f4ANSWERS--
Thef4Submergedf4electrodef4type

Whatf4isf4thef4btuf4outputf4perf4lbf4off4#4f4fuelf4oil?f4-f4ANSWERS--18

Whatf4substancef4isf4usedf4forf4thef4electricf4transmissionf4inf4anf4RTD?f4-f4ANSWERS--
Platinumf4isf4usedf4becausef4off4itsf4stabilityf4atf4highf4temperatures

Howf4muchf4airf4isf4neededf4forf4thef4combustionf4off4pulverizedf4coal;f4gas;f4oil?f4-
f4ANSWERS--50%f4forf4coalf4andf410-30%f4forf4gasf4&f4oil



Inf4oldf4powerf4boilersf4whichf4typef4off4feedwaterf4regulatorsf4weref4notf4used?f4\
n(A)f4hydraulicf4\n(B)f4floatf4\n(C)f4thermostaticf4expansionf4\n(D)f4electronicf4-
f4ANSWERS--ANSWERf4Df4electronic/electro-magnetic



Whatf4isf4hardf4formingf4scale?f4-f4ANSWERS--Silica

Withf4hydroxidef4presentf4andf4normalf4oxygenf4levelsf4whichf4chemicalf4willf4causef4probl
ems?f4-f4ANSWERS--Chlorine

Thef4resultf4fromf4steelf4manufacturingf4andf4underf4pressuref4inf4boilersf4tendsf4tof4causef
4buldging?f4Af4buldgef4isf4causedf4byf4?f4-f4ANSWERS--

Af4buldgef4isf4causedf4byf4overheatingf4off4thef4shellf4platesf4andf4itf4affectsf4thef4entiref4thi
cknessf4off4thef4plate.

Af4blisterf4isf4causedf4byf4whatf4?f4-f4ANSWERS--
Slagf4inclusionf4formingf4af4laminationf4atf4thef4timef4thef4platef4wasf4rolledf4atf4thef4steelf4
mill.f4Af4blisterf4isf4af4separationf4off4thef4metalf4fromf4thef4shellf4platef4causedf4byf4impuriti
esf4rolledf4intof4thef4shellf4platef4whenf4formed.

, Withf4normalf4oxygenf4andf4lowf4alkalinity.f4whatf4isf4addedf4tof4thef4boilerf4water?f4-
f4ANSWERS--Neutralizingf4Amines



Whichf4chemicalf4isf4usedf4tof4combatf4scale?f4-f4ANSWERS--
Combinedf4phosphatef4treatment-f4sodiumf4phosphate

Otherf4thanf4sulfitef4whatf4chemicalf4isf4usedf4tof4combatf4corrosionf4inf4boilers?f4-
f4ANSWERS--Hydrazine



Whatf4willf4neutralizef4acid?f4-f4ANSWERS--Alkalif4andf4Limef4Soda

Whatf4mechanicalf4devicef4isf4usedf4tof4removef4scalef4fromf4firetubes?f4-f4ANSWERS--
Af4tubef4rattlerf4orf4vibrator

Whatf4percentagef4off4thef4pressuref4shouldf4af4boilerf4havef4beforef4youf4testf4thef4leverf4o
ff4af4safetyf4valve?f4-f4ANSWERS--75%

Wheref4isf4internalf4corrosionf4mostf4likelyf4tof4occurf4onf4af4verticalf4tubef4boiler?f4-
f4ANSWERS--Waterf4leg-Mudf4leg



Whatf4aref4thef4minimumf4andf4maximumf4sizesf4permittedf4forf4blowf4downf4valvesf4orf4co
nnections?f4-f4ANSWERS--3/4"minimumf42f4½f4"f4maximum

Af4boilerf4operatingf4atf4af4pressuref4off465lbs.f4Whatf4isf4thef4smallestf4sizef4feedf4andf4blo
wf4offf4connectionsf4iff4thef4safetyf4valvef4isf4setf4atf490f4psi?f4-f4ANSWERS--
½f4"f4feedf4¾f4"f4blowf4off

Howf4oftenf4shouldf4waterf4columnsf4andf4waterf4glassf4levelsf4bef4checkedf4onf4af4highf4pr
essuref4boiler?f4-f4ANSWERS--(Oncef4Af4Shift)\nAtf4thef4beginningf4off4eachf4shiftf4-
f4beginningf4off4thef4workf4effort



Whatf4takesf4nof4actualf4actionf4chemicalf4partf4inf4combustion?f4-f4ANSWERS--Nitrogen

Howf4manyf4ppmf4off4EDTAf4aref4neededf4tof4tief4upf41ppmf4off4hardness?f4-f4ANSWERS--
EDTAf4requiresf410ppmf4off4EDTAf4andf45f4NTAf4tof4tief4upf4eachf41ppmf4hardness.

Onf4af4packagef4boiler;f4howf4manyf4waysf4couldf4causef4firef4puffsf4whenf4itf4isf4startedf4u
p?f4-f4ANSWERS--6f4waysf41-poorf4startingf4draftf42-incorrectf4fireboxf43-
wrongf4burnerf4nozzlef44-leanf4firef45-f4insufficientf4gasf4pilotf4orf4excessivef4gasf4pilotf46-
waterf4inf4thef4oil

Whatf4isf4thef4gradef4off4lightf4domesticf4fuelf4oilf4?f4-f4ANSWERS--
Gradef41f4(f4Numberf41f4)

Howf4oftenf4shouldf4youf4testf4thef4operatingf4control?f4-f4ANSWERS--Annually

Howf4oftenf4shouldf4thef4testingf4andf4inspectingf4off4thef4burnerf4component?f4-
f4ANSWERS--Annually