NCCCO CORE Questions with correct
Answers
A crane is at the point of instability when the crane's leverage on the load equals: --
correct ans--100% of the load's leverage on the crane
A mobile crane's jib is offset 15º versus its original 0º offset, but the boom angle remains
unchanged. In this situation, the load radius: -- correct ans--increases
Arysuddenrystartryorrystopryofrytheryhoistingryfunctionrywhileryoperatingryarymobilerycranerycanrypro
ducerya:ry--rycorrectryans--dynamicryload
Abruptlyrystoppingryaryrapidryswingryonryarylong-
boomrymobilerycranerywillryproducerywhatrymajorryeffect?ry--rycorrectryans--
Collapsingrytheryboom.
AccordingrytoryASMErywhichryofrytheryfollowingrylistedrybelowryshallryNOTryberyusedryforrytherysus
pensionrysystemryonrysuspendedrypersonnelryplatforms?ry--rycorrectryans--
Syntheticrywebrybridle
AccordingrytoryOSHAry1926ry1408,ryforrypowerrylinesryratedry100kVrytheryminimumryclearanceryb
etweenrytherycraneryandryanyrylinesryshallrybe?ry--rycorrectryans--
15ryfeetryw/encroachmentryprecautions
AccordingrytoryOSHAry1926ry1408,rywhenryoperatingrynearryhighryvoltagerypowerrylines,rywhatrycl
earanceryshallryberyrequiredrywhenrytheryratingryofrytherylinesryisry275kV?ry--rycorrectryans--
20ryfeetryw/encroachmentryprecautions
AccordingrytoryOSHAry1926,ry1431,ryatrywindryspeedrymustryaryqualifiedrypersonryberyconsulted?r
y--rycorrectryans--20rymph
AccordingrytoryOSHAry1926.ry1408,rytheryminimumryclearancerybetweenryanyrypartryofrytherycran
eryandrypowerrylinesryratedry50kVryorrybelowryshallrybe:ry--rycorrectryans--
10ryfeetryw/encroachmentryprecautions
AccordingrytoryOSHAry1926.ry1411,rywhenryyouryencounterrypowerrylinesrywithryaryvoltageryofry44
kVryandrytherycraneryisryTRAVELING,ryaccordingrytoryTableryT,rywhatryisrytheryminimumryrequiredr
yclearance?ry--rycorrectryans--6ft
AccordingrytoryOSHAry1926.ry1431,ryduringrypersonnelryplatformryhoistingryoperationsryaccessry
gatesryNOTryswingryinrywhichrydirection?ry--rycorrectryans--Outward
, AccordingrytoryOSHAry1926.ry1431,rywhileryhoistingryarypersonnelryplatform,rywhatryweatherryco
nditionrylistedrybelowrywillrypromptlyrydiscontinuerytheryoperation?ry--rycorrectryans--Dangerous
AccordingrytoryOSHAry1926.1431,rywhichrydevicerylistedrybelowrymustryberyattachedrytorytherycra
ne?ry--rycorrectryans--Anti-two-block
AccordingrytoryOSHAry1926.1431,rywhichryofrytheseryhoistryoptionsryisryprohibited?ry--
rycorrectryans--Hoistryfreeryfall
AccordingrytoryOSHArytableryT,rywhatryisrytheryminimumryclearanceryforry133kVrypowerrylines?ry--
rycorrectryans--10ft
AccordingrytoryOSHArywhenryisryitrysaferytoryhoistryloadsrywithryarymobilerycranerybelowryenergized
rypowerrylines?ry--rycorrectryans--
Whenrytheryfullyryextendedryboomrycan'tryreachrytheryprohibitedryzone.
AccordingrytoryOSHA,ryeachryseriesryofryvoicerysignalsrycontainryhowrymanyryelements?ry--
rycorrectryans--Three
AccordingrytoryOSHA,rymobilerycraneryloadryblockryhooksrymustrynotryhaveryarytwistryinryexcessryof
:ry--rycorrectryans--0
AccordingrytoryOSHA,rymobilerycraneryloadryblocksryhooksrymustrynotryhaveryarythroatryopeningryi
nryexcessryof:ry--rycorrectryans--5%
AccordingrytoryOSHA,ryquadrupleryslingrybridleryratingsryarerytherysameryasry--rycorrectryans--
tripleryslingrybridleryratings
AccordingrytoryOSHA,rywhatryisrytheryminimumrynumberryofryfullrywrapsryofrywireryroperythatrymustry
remainryonryhoistrydrumsryinryallryserviceryconditions?ry--rycorrectryans--2
AccordingrytoryOSHA,rywhenryworkingrynearrypowerrylinesrywhenryisryarydedicatedryspotterryrequi
red?ry--rycorrectryans--Whenrycraneryoperatorryisryunablerytoryseerytherywarningrylineryofrysigns
AccordingrytoryOSHA'srytableryT,rywhatryclearanceryshouldryarymobilerycraneryINryTRANSITrykee
prywhilerygoingryunderry445kVrylines?ry--rycorrectryans--16ft
Backwardrystabilityryofryarymobilerycraneryisrytestedryinrywhichryconfigurationrylistedrybelow?ry--
rycorrectryans--Basicryboomryatryminimumryanglerywithrynoryload
Beforerylevelingryarymobilerycraneryonryoutriggers,ryanryoperatorryshouldryensure:ry--
rycorrectryans--thereryisrynoryweightryofrytherycranerybearingryonryanyrytires
Beforeryliftingryanryoccupiedrypersonnelryplatformryonryaryjobrysiterytherycrewrymustryensurerytheyry
performrywhichryofrytheryfollowing?ry--rycorrectryans--Mustryattendryarypre-ryliftrymeeting
Mustryfullyrydeployryallryoutriggers
Answers
A crane is at the point of instability when the crane's leverage on the load equals: --
correct ans--100% of the load's leverage on the crane
A mobile crane's jib is offset 15º versus its original 0º offset, but the boom angle remains
unchanged. In this situation, the load radius: -- correct ans--increases
Arysuddenrystartryorrystopryofrytheryhoistingryfunctionrywhileryoperatingryarymobilerycranerycanrypro
ducerya:ry--rycorrectryans--dynamicryload
Abruptlyrystoppingryaryrapidryswingryonryarylong-
boomrymobilerycranerywillryproducerywhatrymajorryeffect?ry--rycorrectryans--
Collapsingrytheryboom.
AccordingrytoryASMErywhichryofrytheryfollowingrylistedrybelowryshallryNOTryberyusedryforrytherysus
pensionrysystemryonrysuspendedrypersonnelryplatforms?ry--rycorrectryans--
Syntheticrywebrybridle
AccordingrytoryOSHAry1926ry1408,ryforrypowerrylinesryratedry100kVrytheryminimumryclearanceryb
etweenrytherycraneryandryanyrylinesryshallrybe?ry--rycorrectryans--
15ryfeetryw/encroachmentryprecautions
AccordingrytoryOSHAry1926ry1408,rywhenryoperatingrynearryhighryvoltagerypowerrylines,rywhatrycl
earanceryshallryberyrequiredrywhenrytheryratingryofrytherylinesryisry275kV?ry--rycorrectryans--
20ryfeetryw/encroachmentryprecautions
AccordingrytoryOSHAry1926,ry1431,ryatrywindryspeedrymustryaryqualifiedrypersonryberyconsulted?r
y--rycorrectryans--20rymph
AccordingrytoryOSHAry1926.ry1408,rytheryminimumryclearancerybetweenryanyrypartryofrytherycran
eryandrypowerrylinesryratedry50kVryorrybelowryshallrybe:ry--rycorrectryans--
10ryfeetryw/encroachmentryprecautions
AccordingrytoryOSHAry1926.ry1411,rywhenryyouryencounterrypowerrylinesrywithryaryvoltageryofry44
kVryandrytherycraneryisryTRAVELING,ryaccordingrytoryTableryT,rywhatryisrytheryminimumryrequiredr
yclearance?ry--rycorrectryans--6ft
AccordingrytoryOSHAry1926.ry1431,ryduringrypersonnelryplatformryhoistingryoperationsryaccessry
gatesryNOTryswingryinrywhichrydirection?ry--rycorrectryans--Outward
, AccordingrytoryOSHAry1926.ry1431,rywhileryhoistingryarypersonnelryplatform,rywhatryweatherryco
nditionrylistedrybelowrywillrypromptlyrydiscontinuerytheryoperation?ry--rycorrectryans--Dangerous
AccordingrytoryOSHAry1926.1431,rywhichrydevicerylistedrybelowrymustryberyattachedrytorytherycra
ne?ry--rycorrectryans--Anti-two-block
AccordingrytoryOSHAry1926.1431,rywhichryofrytheseryhoistryoptionsryisryprohibited?ry--
rycorrectryans--Hoistryfreeryfall
AccordingrytoryOSHArytableryT,rywhatryisrytheryminimumryclearanceryforry133kVrypowerrylines?ry--
rycorrectryans--10ft
AccordingrytoryOSHArywhenryisryitrysaferytoryhoistryloadsrywithryarymobilerycranerybelowryenergized
rypowerrylines?ry--rycorrectryans--
Whenrytheryfullyryextendedryboomrycan'tryreachrytheryprohibitedryzone.
AccordingrytoryOSHA,ryeachryseriesryofryvoicerysignalsrycontainryhowrymanyryelements?ry--
rycorrectryans--Three
AccordingrytoryOSHA,rymobilerycraneryloadryblockryhooksrymustrynotryhaveryarytwistryinryexcessryof
:ry--rycorrectryans--0
AccordingrytoryOSHA,rymobilerycraneryloadryblocksryhooksrymustrynotryhaveryarythroatryopeningryi
nryexcessryof:ry--rycorrectryans--5%
AccordingrytoryOSHA,ryquadrupleryslingrybridleryratingsryarerytherysameryasry--rycorrectryans--
tripleryslingrybridleryratings
AccordingrytoryOSHA,rywhatryisrytheryminimumrynumberryofryfullrywrapsryofrywireryroperythatrymustry
remainryonryhoistrydrumsryinryallryserviceryconditions?ry--rycorrectryans--2
AccordingrytoryOSHA,rywhenryworkingrynearrypowerrylinesrywhenryisryarydedicatedryspotterryrequi
red?ry--rycorrectryans--Whenrycraneryoperatorryisryunablerytoryseerytherywarningrylineryofrysigns
AccordingrytoryOSHA'srytableryT,rywhatryclearanceryshouldryarymobilerycraneryINryTRANSITrykee
prywhilerygoingryunderry445kVrylines?ry--rycorrectryans--16ft
Backwardrystabilityryofryarymobilerycraneryisrytestedryinrywhichryconfigurationrylistedrybelow?ry--
rycorrectryans--Basicryboomryatryminimumryanglerywithrynoryload
Beforerylevelingryarymobilerycraneryonryoutriggers,ryanryoperatorryshouldryensure:ry--
rycorrectryans--thereryisrynoryweightryofrytherycranerybearingryonryanyrytires
Beforeryliftingryanryoccupiedrypersonnelryplatformryonryaryjobrysiterytherycrewrymustryensurerytheyry
performrywhichryofrytheryfollowing?ry--rycorrectryans--Mustryattendryarypre-ryliftrymeeting
Mustryfullyrydeployryallryoutriggers
