4B POWER ENGINEERING - FINAL - NAIT KNOWLEDGE CHECKS QUESTIONS
AND VERIFIED ANSWERS
A chot cwater cboiler coperating ccontrol c(Aquastat) cmay cbe ca cpressure cswitch:
*A* cthat cis cnormally copen
*B* cthat cresponds cto cthe cexpansion cand ccontraction cof cboiler cwater
*C* coperated cby ca cfilled csystem cthermometer
*D* cthat cis csensitive cto csteam cpressure c- cCORRECT cANS✔✔C
A clight cfuel coil cflame cshould
*A* cimpinge con cthe crefractory, cto cstabilize cignition.
*B* cbe cbright cyellow, cwith corange cat cthe ctips cof cthe cflame.
*C* cbe cpredominantly cblue, cwith corange cat cthe ctips cof cthe cflame.
*D* cbe cbright cyellow, cwith csmoke cat cthe ctips cof cthe cflame. c- cCORRECT cANS✔✔B
The cpurpose cof cthe cpipe csiphon cinstalled cbetween cthe cboiler cand cthe cpressure cgauge cis cto cprevent:
*A* cAir cfrom centering cthe cgauge
*B* cWater cfrom centering cthe cgauge
*C* cHot csteam cfrom centering cthe cgauge
*D* cAir cfrom centering cthe cboiler c- cCORRECT cANS✔✔C
Boilers cshould cbe cwarmed cup
*A* cwith cmaximum ccombustion cair, cto cprevent csmoking
*B* crapidly, cso cthe cmetal cheats cup cfaster
*C* cslowly, cto cminimize cdifferential cexpansion cand cthermal cshock
*D* cusing conly cthe cpilot cburner. c- cCORRECT cANS✔✔C
The cdischarge cpipe cfrom ca cboiler csafety cvalve cis csupported cindependently cof cthe csafety cvalve: c
*A* cBecause cthe csteam cdrum ccannot csupport cthe cextra cmass cof cthe cdischarge cpipe
*B* cSo cthe cdischarge cpipe ccan cdrain cmore ceasily
*C* cSo cthe cdischarge cpipe ccan cexpand cwithout cputting cforce con cthe csafety cvalve
*D* cTo cprevent cleakage cat cthe cpipe cjoint c- cCORRECT cANS✔✔C
A cmodulating ccontrol csteam cheating cboiler:
*A* cIs calways cfully cautomatic
*B* cWill chave ca cnarrow coperating cpressure crange
*C* cMaintains ca csteadier cboiler cpressure cthan cmulti-position ccontrol
*D* cWill chave ca cconstant ccombustion cair cflow crate c- cCORRECT cANS✔✔C
Which cof cthe cfollowing cis ca cdesiccant cused cfor cdry clayup?
*A* cSilicone cGel
*B* cLime csoda
*C* cQuick clime
*D* cSoda cash c- cCORRECT cANS✔✔C
The cprime cimportance cof cboiler cfittings cis:
*A* cEconomics
*B* cTo csatisfy cregulations
,*C* cSafety c& cefficiency
*D* cConvenience c- cCORRECT cANS✔✔C
If ca cnew cboiler cis cnot cboiled cout ccorrectly, cthe cresult cmay cbe:
*A* cRefractory cdamage
*B* cExcessive cwaterside ccorrosion
*C* cExcessively chigh cwater ccirculation crates
*D* cFoaming c- cCORRECT cANS✔✔D
Because cnatural cgas cis ccolourless cand codourless, c___________ cis cadded cto cthe cgas cso cthat cit cis ceasier cto cdetect ca cleak.
*A* cfluorescent cdye
*B* cpropane
*C* can cirritant
*D* cmercaptan c- cCORRECT cANS✔✔D
One cpurpose cof cthe csmall cvalve con ctop cof cthe cshell cof cmost cboilers, cwhich cis cnot crequired cby ccode, cis cto:
*A* callow cwater cinto cthe cboiler cwhen cthe cboiler cis cbeing cdrained cor ccooled cpreventing cthe cformation cof ca cvacuum.
*B* callow cwater cto cescape cbefore cthe csteam cstop cvalve cis copened cduring cthe cwarm-up cperiod.
*C* callow cair cto cescape cfrom cthe cboiler cwhen cthe cboiler cis cbeing cfilled cwith cwater.
*D* callow cair cinto cthe cboiler cwhen cthe cboiler cis cbeing cfilled cwith cwater. c- cCORRECT cANS✔✔C
Mechanical cchart crecorders
*A* crequire cregular creplacement cof cpaper cand cink.
*B* cneed ctheir ccharts creplaced ceach cmonth.
*C* crequire cconstant cwinding cof ctheir cclock cmechanisms.
*D* care cused cso cregular creadings cdo cnot cneed cto cbe ctaken. c- cCORRECT cANS✔✔C
Tubular cgauge cglasses:
*A* cAre csuitable cfor cpressures cup cto cabout c3000 ckPa
*B* cAre cmade cof cglass, cin corder cto cresistant cboiler calkalinity
*C* cIndicate cthe clevel cmore caccurately cthan cother cforms cof cwater clevel cindication
*D* cCan conly cbe cinstalled con clow-pressure cboilers c- cCORRECT cANS✔✔A
What cis cthe crecommended ctest cfrequency cfor cflame csafeguard cdevices?
*A* cevery cshift
*B* cdaily
*C* cweekly
*D* cannually c- cCORRECT cANS✔✔C
All cflame csafeguard cdevices chave cthe cfollowing cin ccommon:
*A* cClose cthe csafety cshut-off cvalves cin ccase cof cpilot cflame cfailure cor cmain cburner cfailure.
*B* cAre climited cto ctemperatures ccomfortable cto cthe chand.
*C* cMonitor cthe cpilot cflame cand cmain cburner csimultaneously.
*D* cActivate can calarm csystem cif cflame cfailure cis cdetected c- cCORRECT cANS✔✔A
What cis cthe crecommended cboiler cwater cpH cfor cwet clayup?
*A* c7
*B* c7.5
*C* c12
*D* c10 c- cCORRECT cANS✔✔D
The cwater clevel cindicated cin ca cboiler cgauge cglass cis:
*A* cSlightly cless cthan cthe cactual cdrum clevel.
*B* cThe cactual cdrum clevel, cregardless cof coperating cconditions
*C* cSlightly chigher cthan cthe cactual cdrum clevel cwhen cthe cpressure cis chigh.
*D* cSlightly chigher cthan cthe cactual cdrum clevel cwhen cthe cboiler cis con clow cfire. c- cCORRECT cANS✔✔A
A clow cfire cstart cswitch:
*A* cIs ca ctype cof cmanual cover cride
*B* cEnsures cthe cpurge ctakes cplace cwith cthe cdamper cin cthe clow-fire cposition
*C* cActs cas ca cpre-ignition cinterlock cto censure cminimum cdamper csetting cduring cignition
*D* cIs cclosed cwhen cthe cdamper cis cat chigh cfire. c- cCORRECT cANS✔✔C
In cthe cevent cof ca cpower cfailure, cwhich cof cthe cfollowing cwill clikely crequire ca cmanual crestart cwhen cpower cis crestored?
,*A* csmall ccondensate creturn cpumps
*B* clarge cair ccompressors
*C* cunit cheater cfans
*D* cair cdryers c- cCORRECT cANS✔✔B
At cthe cend cof cthe cpre-purge cperiod, cthe cprogramming ccontrol:
*A* cOpens cthe cmain cfuel cvalve
*B* cCloses cthe cpilot cvalve
*C* cEnds cthe cignition ctrial
*D* cEnergizes cthe cignition ctransformer c- cCORRECT cANS✔✔D
Which cof cthe cfollowing cmay ccause cwater chammer cin csteam clines?
*A* copening csteam cvalves cslowly.
*B* copening cthe csteam ctrap cbypass cvalves.
*C* cmissing cor cdamaged cpipe cinsulation.
*D* chaving ctoo cmany ccondensate cdrains copen. c- cCORRECT cANS✔✔C
What cshould cPower cEngineers ccarry cat call ctimes?
*A* ca csmall cwrench
*B* ca ccell cphone
*C* ca cflashlight
*D* cspare cfuses c- cCORRECT cANS✔✔C
During cthe cstart-up cof ca cfully cautomatic cboiler, cthe cmain cburner csafety cshut-off cvalve c(SSOV):
*A* cMust cbe copened cbefore cthe cignition ctransformer cenergizes
*B* cCan cbe copened cany ctime cduring cthe cstart-up csequence
*C* cShould cbe copened cas csoon cas cthe cpilot cvalve copens
*D* cMust cbe cclosed cbefore cpilot cignition c- cCORRECT cANS✔✔D
When ca cboiler csteam coutlet cstop cvalve cis crequired cby ccode, cthe cpreferred cstyle cof cvalve cis:
*A* ca cnon-rising cstem cglobe cvalve
*B* can coutside cscrew cand cyoke, crising cstem cvalve
*C* ca cnon-rising cstem cgate cvalve
*D* ca cball cvalve c- cCORRECT cANS✔✔B
When cwarming cup ca csteam cboiler, copen cthe cboiler cdrum cvent cto
*A* cprevent cover-pressurization cof cthe cboiler cduring cstart-up.
*B* cpermit cthe crelease cof ccorrosive cdissolved cgases, csuch cas coxygen cand ccarbon cdioxide, cfrom cthe cboiler cwater.
*C* censure ca cflow cof csteam cthrough cthe csuperheater cbanks.
*D* ckeep ca cvacuum cfrom cforming cin cthe cdrum, cif cthe cburner ctrips coff. c- cCORRECT cANS✔✔B
A cflame crod:
*A* cIs cused cin ccombination cwith ca cphotocell
*B* cIs cused conly cfor coil cfired cburners
*C* cForms can celectric ccircuit cwith cthe crod, cflame cand cburner
*D* cDevelops ca chigh cresistance cin cthe cpresence cof ca cflame. c- cCORRECT cANS✔✔C
When clocking cout ca ccooled cdown csteam cboiler
*A* cclose cthe cwater ccolumn cand cgauge cglassvalves, cand clock cthem.
*B* cclose cthe cnon-return cvalve cdrain, cand clock cit.
*C* copen cthe cdrum cvent, cand clock cor ctag cit.
*D* copen cthe ccontinuous cblowdown cvalve cand ctag cit. c- cCORRECT cANS✔✔C
A cboiler cwith ca csingle csafety cvalve chas ca cmaximum callowable cworking cpressure cof c1000 ckPa. cWhat cis cthe cmaximum cboiler
cpressure cpermissible cwhen cthe csafety cvalve cis cblowing?
*A* c1060 ckPa
*B* c1000 ckPa
*C* c1030 ckPa
*D* c1100 ckPa c- cCORRECT cANS✔✔A
A cfloat coperated clow cwater cfuel ccutoff chas cits cswitch cseparated cfrom cboiler cpressure cby:
*A* cA cfloat ccage
*B* cA cseal ccage
*C* cA cbellows
*D* cPacking c- cCORRECT cANS✔✔C
, The cmost cimportant crule cin csafe coperation cof csteam cboilers cis cto:
*A* ckeep cthe cheat ctransfer csurfaces cclean.
*B* cmaintain cthe cboiler croom clog
*C* ctry cto ckeep cmake-up cwater cto ca cminimum.
*D* ckeep cwater cin cthe cboiler cat cthe cproper clevel. c- cCORRECT cANS✔✔D
As cpart cof ca cpreventative cmaintenance cschedule, cduty cswaps:
*A* cdistribute cwear cbetween cregular cand cstandby cequipment.
*B* care cseldom cperformed conboiler cfeed cpumps.
*C* cinvolve cstarting ca cpiece cof cequipment cto crecord cperformance cdata, cand cthen cshutting cit cdown cagain.
*D* care cperformed cwhen canother cpiece cof cequipment cbreaks cdown. c- cCORRECT cANS✔✔A
The csafety cvalves con ca cboiler care cset cto copen cat c1380 ckPa. cThe cboiler cMAWP cis c1380 ckPa. cHow cmuch chigher ccan cthe
cboiler cpressure crise cabove c1380 ckPa, cif cit cis cfired cat cfull ccapacity cwith cthe csteam coutlet cvalve cclosed?
*A* c37.5 ckPa
*B* c41.4 ckPa
*C* c0 ckPa
*D* c82.8 ckPa c- cCORRECT cANS✔✔D
A chigh cwater clevel cin ca cboiler:
*A* cWill ccause cthe chigh cwater ccut-off cto cshut cdown cthe cboiler
*B* cIs cusually ccaused cby ca cboiler cfeed cpump cmalfunction
*C* cWill cnecessitate can cimmediate cshutdown cand ccool cdown
*D* cMay ccause cwater ccarryover cinto cthe cheader c- cCORRECT cANS✔✔D
When cthe cenergy coutput cand cthe cenergy cdemand care cequal, cthe cboiler cpressure
*A* crises
*B* cremains cconstant
*C* cfalls
*D* cbecomes cunstable c- cCORRECT cANS✔✔B
When ca cpower cfailure coccurs, ccontrol cvalves
*A* cgo cto ca cfail-safe cposition.
*B* cfail copen.
*C* cfail cshut.
*D* cfail clast. c- cCORRECT cANS✔✔A
A ctest cconnection cfor ca cboiler cpressure cgauge:
*A* cShould cbe clocated cupstream cof ca csiphon
*B* cShould cbe cof c12.7 cmm cNPT csize
*C* cIs crequired con call cboilers
*D* cIs cusually cinstalled cbetween cthe csiphon cand cthe cpressure cgauge c- cCORRECT cANS✔✔D
Thermal cshock cto chot cwater cboilers ccan cbe creduced cby:
*A* cInstalling crefractory cblanket cin cthe cfurnace cto cprotect cthe ctubes.
*B* cRemoving csoot cand cash cfrom cthe cfireside.
*C* cPreventing cthe cfull cflow cof ccool creturn cwater cinto cthe cboiler cduring cthe cwarm-up cperiod
*D* cOperating cwith cmaximum cairflow, cso cthat cexcess cheat cis ccarried caway cin cthe cchimney. c- cCORRECT cANS✔✔C
According cto cASME cIV, cthe cscale cof ca cpressure cgauge cfor ca csteam cboiler cshall cbe cgraduated cto cnot cless cthan
*A* c100 cto c300 ckPa
*B* c200 cto c414 ckPa
*C* c2500 cto c3000 ckPa
*D* c125 cto c325 ckPa c- cCORRECT cANS✔✔B
When cdifferential cpressure cis cused cto cmeasure cwater clevel cin ca cboiler csteam cdrum, cthe cdifferential cpressure cis:
*A* cLeast cwhen cdrum clevel cis clow
*B* cGreatest cwhen csteam cpressure cis clow
*C* cGreatest cwhen cdrum clevel cis clow
*D* cGreatest cwhen cdrum clevel cis chigh c- cCORRECT cANS✔✔C
When ca ccombustion cair copening cis cequipped cwith cdampers, cthe cdampers cmust cbe
*A* cinterlocked cwith cthe cburner, cand cfully copen cbefore cstarting cthe cboiler.
AND VERIFIED ANSWERS
A chot cwater cboiler coperating ccontrol c(Aquastat) cmay cbe ca cpressure cswitch:
*A* cthat cis cnormally copen
*B* cthat cresponds cto cthe cexpansion cand ccontraction cof cboiler cwater
*C* coperated cby ca cfilled csystem cthermometer
*D* cthat cis csensitive cto csteam cpressure c- cCORRECT cANS✔✔C
A clight cfuel coil cflame cshould
*A* cimpinge con cthe crefractory, cto cstabilize cignition.
*B* cbe cbright cyellow, cwith corange cat cthe ctips cof cthe cflame.
*C* cbe cpredominantly cblue, cwith corange cat cthe ctips cof cthe cflame.
*D* cbe cbright cyellow, cwith csmoke cat cthe ctips cof cthe cflame. c- cCORRECT cANS✔✔B
The cpurpose cof cthe cpipe csiphon cinstalled cbetween cthe cboiler cand cthe cpressure cgauge cis cto cprevent:
*A* cAir cfrom centering cthe cgauge
*B* cWater cfrom centering cthe cgauge
*C* cHot csteam cfrom centering cthe cgauge
*D* cAir cfrom centering cthe cboiler c- cCORRECT cANS✔✔C
Boilers cshould cbe cwarmed cup
*A* cwith cmaximum ccombustion cair, cto cprevent csmoking
*B* crapidly, cso cthe cmetal cheats cup cfaster
*C* cslowly, cto cminimize cdifferential cexpansion cand cthermal cshock
*D* cusing conly cthe cpilot cburner. c- cCORRECT cANS✔✔C
The cdischarge cpipe cfrom ca cboiler csafety cvalve cis csupported cindependently cof cthe csafety cvalve: c
*A* cBecause cthe csteam cdrum ccannot csupport cthe cextra cmass cof cthe cdischarge cpipe
*B* cSo cthe cdischarge cpipe ccan cdrain cmore ceasily
*C* cSo cthe cdischarge cpipe ccan cexpand cwithout cputting cforce con cthe csafety cvalve
*D* cTo cprevent cleakage cat cthe cpipe cjoint c- cCORRECT cANS✔✔C
A cmodulating ccontrol csteam cheating cboiler:
*A* cIs calways cfully cautomatic
*B* cWill chave ca cnarrow coperating cpressure crange
*C* cMaintains ca csteadier cboiler cpressure cthan cmulti-position ccontrol
*D* cWill chave ca cconstant ccombustion cair cflow crate c- cCORRECT cANS✔✔C
Which cof cthe cfollowing cis ca cdesiccant cused cfor cdry clayup?
*A* cSilicone cGel
*B* cLime csoda
*C* cQuick clime
*D* cSoda cash c- cCORRECT cANS✔✔C
The cprime cimportance cof cboiler cfittings cis:
*A* cEconomics
*B* cTo csatisfy cregulations
,*C* cSafety c& cefficiency
*D* cConvenience c- cCORRECT cANS✔✔C
If ca cnew cboiler cis cnot cboiled cout ccorrectly, cthe cresult cmay cbe:
*A* cRefractory cdamage
*B* cExcessive cwaterside ccorrosion
*C* cExcessively chigh cwater ccirculation crates
*D* cFoaming c- cCORRECT cANS✔✔D
Because cnatural cgas cis ccolourless cand codourless, c___________ cis cadded cto cthe cgas cso cthat cit cis ceasier cto cdetect ca cleak.
*A* cfluorescent cdye
*B* cpropane
*C* can cirritant
*D* cmercaptan c- cCORRECT cANS✔✔D
One cpurpose cof cthe csmall cvalve con ctop cof cthe cshell cof cmost cboilers, cwhich cis cnot crequired cby ccode, cis cto:
*A* callow cwater cinto cthe cboiler cwhen cthe cboiler cis cbeing cdrained cor ccooled cpreventing cthe cformation cof ca cvacuum.
*B* callow cwater cto cescape cbefore cthe csteam cstop cvalve cis copened cduring cthe cwarm-up cperiod.
*C* callow cair cto cescape cfrom cthe cboiler cwhen cthe cboiler cis cbeing cfilled cwith cwater.
*D* callow cair cinto cthe cboiler cwhen cthe cboiler cis cbeing cfilled cwith cwater. c- cCORRECT cANS✔✔C
Mechanical cchart crecorders
*A* crequire cregular creplacement cof cpaper cand cink.
*B* cneed ctheir ccharts creplaced ceach cmonth.
*C* crequire cconstant cwinding cof ctheir cclock cmechanisms.
*D* care cused cso cregular creadings cdo cnot cneed cto cbe ctaken. c- cCORRECT cANS✔✔C
Tubular cgauge cglasses:
*A* cAre csuitable cfor cpressures cup cto cabout c3000 ckPa
*B* cAre cmade cof cglass, cin corder cto cresistant cboiler calkalinity
*C* cIndicate cthe clevel cmore caccurately cthan cother cforms cof cwater clevel cindication
*D* cCan conly cbe cinstalled con clow-pressure cboilers c- cCORRECT cANS✔✔A
What cis cthe crecommended ctest cfrequency cfor cflame csafeguard cdevices?
*A* cevery cshift
*B* cdaily
*C* cweekly
*D* cannually c- cCORRECT cANS✔✔C
All cflame csafeguard cdevices chave cthe cfollowing cin ccommon:
*A* cClose cthe csafety cshut-off cvalves cin ccase cof cpilot cflame cfailure cor cmain cburner cfailure.
*B* cAre climited cto ctemperatures ccomfortable cto cthe chand.
*C* cMonitor cthe cpilot cflame cand cmain cburner csimultaneously.
*D* cActivate can calarm csystem cif cflame cfailure cis cdetected c- cCORRECT cANS✔✔A
What cis cthe crecommended cboiler cwater cpH cfor cwet clayup?
*A* c7
*B* c7.5
*C* c12
*D* c10 c- cCORRECT cANS✔✔D
The cwater clevel cindicated cin ca cboiler cgauge cglass cis:
*A* cSlightly cless cthan cthe cactual cdrum clevel.
*B* cThe cactual cdrum clevel, cregardless cof coperating cconditions
*C* cSlightly chigher cthan cthe cactual cdrum clevel cwhen cthe cpressure cis chigh.
*D* cSlightly chigher cthan cthe cactual cdrum clevel cwhen cthe cboiler cis con clow cfire. c- cCORRECT cANS✔✔A
A clow cfire cstart cswitch:
*A* cIs ca ctype cof cmanual cover cride
*B* cEnsures cthe cpurge ctakes cplace cwith cthe cdamper cin cthe clow-fire cposition
*C* cActs cas ca cpre-ignition cinterlock cto censure cminimum cdamper csetting cduring cignition
*D* cIs cclosed cwhen cthe cdamper cis cat chigh cfire. c- cCORRECT cANS✔✔C
In cthe cevent cof ca cpower cfailure, cwhich cof cthe cfollowing cwill clikely crequire ca cmanual crestart cwhen cpower cis crestored?
,*A* csmall ccondensate creturn cpumps
*B* clarge cair ccompressors
*C* cunit cheater cfans
*D* cair cdryers c- cCORRECT cANS✔✔B
At cthe cend cof cthe cpre-purge cperiod, cthe cprogramming ccontrol:
*A* cOpens cthe cmain cfuel cvalve
*B* cCloses cthe cpilot cvalve
*C* cEnds cthe cignition ctrial
*D* cEnergizes cthe cignition ctransformer c- cCORRECT cANS✔✔D
Which cof cthe cfollowing cmay ccause cwater chammer cin csteam clines?
*A* copening csteam cvalves cslowly.
*B* copening cthe csteam ctrap cbypass cvalves.
*C* cmissing cor cdamaged cpipe cinsulation.
*D* chaving ctoo cmany ccondensate cdrains copen. c- cCORRECT cANS✔✔C
What cshould cPower cEngineers ccarry cat call ctimes?
*A* ca csmall cwrench
*B* ca ccell cphone
*C* ca cflashlight
*D* cspare cfuses c- cCORRECT cANS✔✔C
During cthe cstart-up cof ca cfully cautomatic cboiler, cthe cmain cburner csafety cshut-off cvalve c(SSOV):
*A* cMust cbe copened cbefore cthe cignition ctransformer cenergizes
*B* cCan cbe copened cany ctime cduring cthe cstart-up csequence
*C* cShould cbe copened cas csoon cas cthe cpilot cvalve copens
*D* cMust cbe cclosed cbefore cpilot cignition c- cCORRECT cANS✔✔D
When ca cboiler csteam coutlet cstop cvalve cis crequired cby ccode, cthe cpreferred cstyle cof cvalve cis:
*A* ca cnon-rising cstem cglobe cvalve
*B* can coutside cscrew cand cyoke, crising cstem cvalve
*C* ca cnon-rising cstem cgate cvalve
*D* ca cball cvalve c- cCORRECT cANS✔✔B
When cwarming cup ca csteam cboiler, copen cthe cboiler cdrum cvent cto
*A* cprevent cover-pressurization cof cthe cboiler cduring cstart-up.
*B* cpermit cthe crelease cof ccorrosive cdissolved cgases, csuch cas coxygen cand ccarbon cdioxide, cfrom cthe cboiler cwater.
*C* censure ca cflow cof csteam cthrough cthe csuperheater cbanks.
*D* ckeep ca cvacuum cfrom cforming cin cthe cdrum, cif cthe cburner ctrips coff. c- cCORRECT cANS✔✔B
A cflame crod:
*A* cIs cused cin ccombination cwith ca cphotocell
*B* cIs cused conly cfor coil cfired cburners
*C* cForms can celectric ccircuit cwith cthe crod, cflame cand cburner
*D* cDevelops ca chigh cresistance cin cthe cpresence cof ca cflame. c- cCORRECT cANS✔✔C
When clocking cout ca ccooled cdown csteam cboiler
*A* cclose cthe cwater ccolumn cand cgauge cglassvalves, cand clock cthem.
*B* cclose cthe cnon-return cvalve cdrain, cand clock cit.
*C* copen cthe cdrum cvent, cand clock cor ctag cit.
*D* copen cthe ccontinuous cblowdown cvalve cand ctag cit. c- cCORRECT cANS✔✔C
A cboiler cwith ca csingle csafety cvalve chas ca cmaximum callowable cworking cpressure cof c1000 ckPa. cWhat cis cthe cmaximum cboiler
cpressure cpermissible cwhen cthe csafety cvalve cis cblowing?
*A* c1060 ckPa
*B* c1000 ckPa
*C* c1030 ckPa
*D* c1100 ckPa c- cCORRECT cANS✔✔A
A cfloat coperated clow cwater cfuel ccutoff chas cits cswitch cseparated cfrom cboiler cpressure cby:
*A* cA cfloat ccage
*B* cA cseal ccage
*C* cA cbellows
*D* cPacking c- cCORRECT cANS✔✔C
, The cmost cimportant crule cin csafe coperation cof csteam cboilers cis cto:
*A* ckeep cthe cheat ctransfer csurfaces cclean.
*B* cmaintain cthe cboiler croom clog
*C* ctry cto ckeep cmake-up cwater cto ca cminimum.
*D* ckeep cwater cin cthe cboiler cat cthe cproper clevel. c- cCORRECT cANS✔✔D
As cpart cof ca cpreventative cmaintenance cschedule, cduty cswaps:
*A* cdistribute cwear cbetween cregular cand cstandby cequipment.
*B* care cseldom cperformed conboiler cfeed cpumps.
*C* cinvolve cstarting ca cpiece cof cequipment cto crecord cperformance cdata, cand cthen cshutting cit cdown cagain.
*D* care cperformed cwhen canother cpiece cof cequipment cbreaks cdown. c- cCORRECT cANS✔✔A
The csafety cvalves con ca cboiler care cset cto copen cat c1380 ckPa. cThe cboiler cMAWP cis c1380 ckPa. cHow cmuch chigher ccan cthe
cboiler cpressure crise cabove c1380 ckPa, cif cit cis cfired cat cfull ccapacity cwith cthe csteam coutlet cvalve cclosed?
*A* c37.5 ckPa
*B* c41.4 ckPa
*C* c0 ckPa
*D* c82.8 ckPa c- cCORRECT cANS✔✔D
A chigh cwater clevel cin ca cboiler:
*A* cWill ccause cthe chigh cwater ccut-off cto cshut cdown cthe cboiler
*B* cIs cusually ccaused cby ca cboiler cfeed cpump cmalfunction
*C* cWill cnecessitate can cimmediate cshutdown cand ccool cdown
*D* cMay ccause cwater ccarryover cinto cthe cheader c- cCORRECT cANS✔✔D
When cthe cenergy coutput cand cthe cenergy cdemand care cequal, cthe cboiler cpressure
*A* crises
*B* cremains cconstant
*C* cfalls
*D* cbecomes cunstable c- cCORRECT cANS✔✔B
When ca cpower cfailure coccurs, ccontrol cvalves
*A* cgo cto ca cfail-safe cposition.
*B* cfail copen.
*C* cfail cshut.
*D* cfail clast. c- cCORRECT cANS✔✔A
A ctest cconnection cfor ca cboiler cpressure cgauge:
*A* cShould cbe clocated cupstream cof ca csiphon
*B* cShould cbe cof c12.7 cmm cNPT csize
*C* cIs crequired con call cboilers
*D* cIs cusually cinstalled cbetween cthe csiphon cand cthe cpressure cgauge c- cCORRECT cANS✔✔D
Thermal cshock cto chot cwater cboilers ccan cbe creduced cby:
*A* cInstalling crefractory cblanket cin cthe cfurnace cto cprotect cthe ctubes.
*B* cRemoving csoot cand cash cfrom cthe cfireside.
*C* cPreventing cthe cfull cflow cof ccool creturn cwater cinto cthe cboiler cduring cthe cwarm-up cperiod
*D* cOperating cwith cmaximum cairflow, cso cthat cexcess cheat cis ccarried caway cin cthe cchimney. c- cCORRECT cANS✔✔C
According cto cASME cIV, cthe cscale cof ca cpressure cgauge cfor ca csteam cboiler cshall cbe cgraduated cto cnot cless cthan
*A* c100 cto c300 ckPa
*B* c200 cto c414 ckPa
*C* c2500 cto c3000 ckPa
*D* c125 cto c325 ckPa c- cCORRECT cANS✔✔B
When cdifferential cpressure cis cused cto cmeasure cwater clevel cin ca cboiler csteam cdrum, cthe cdifferential cpressure cis:
*A* cLeast cwhen cdrum clevel cis clow
*B* cGreatest cwhen csteam cpressure cis clow
*C* cGreatest cwhen cdrum clevel cis clow
*D* cGreatest cwhen cdrum clevel cis chigh c- cCORRECT cANS✔✔C
When ca ccombustion cair copening cis cequipped cwith cdampers, cthe cdampers cmust cbe
*A* cinterlocked cwith cthe cburner, cand cfully copen cbefore cstarting cthe cboiler.
