EWRB THEORY PREP – MCBS
QUESTIONS WITH ALL ANSWERS
types bof bMCB btrips b- bcorrect banswer-thermal
magnetic
thermal btripping b- bcorrect banswer-bi-metal bstrip, bused bfor boverload bcurrents bprotection
magnetic btripping b- bcorrect banswer-magnetic binductor, bused bfor bshort bcircuit bprotection
reset bprocedure b- bcorrect banswer-reset bto bOFF
reset bto bON
arc bcontainment bincludes b- bcorrect banswer-horns bcarry bcurrent bto bchute, ballow barc bto
bjump bout
arc bchute blengthens bdistance bfor barc bto btravel
oil bsuppresses barc
splitter bplates bsplit bthe barc
arc bcontrol bfactors b- bcorrect banswer-reduced bhorns bwidth bminimize barc bx bsection
more bplates bsplit barc binto bmultiple bsmaller bvoltages
maximize barc bchute bincreases btravel bdistance bfor barc
Four bkey bparts bof bMCBs b- bcorrect banswer-A. btrip boperating bunit
B. bcontrol bcontacts bunit
C. barcing bext. bunit
D. bframe bunit
describe b(A. btrip boperating bunit b) bcomponent bfunction b- bcorrect banswer-bi-metal/mag.
bprovides bmechanism bfor bdetection bof bfault bcurrent band bopens bcontacts
describe b(B. bcontrol bcontacts bunit b) bcomponent bfunction b- bcorrect banswer-contacts
ballows bthe bsupply bcurrent bto bflow bduring bnormal brunning bwhen bMCB bis bclosed
QUESTIONS WITH ALL ANSWERS
types bof bMCB btrips b- bcorrect banswer-thermal
magnetic
thermal btripping b- bcorrect banswer-bi-metal bstrip, bused bfor boverload bcurrents bprotection
magnetic btripping b- bcorrect banswer-magnetic binductor, bused bfor bshort bcircuit bprotection
reset bprocedure b- bcorrect banswer-reset bto bOFF
reset bto bON
arc bcontainment bincludes b- bcorrect banswer-horns bcarry bcurrent bto bchute, ballow barc bto
bjump bout
arc bchute blengthens bdistance bfor barc bto btravel
oil bsuppresses barc
splitter bplates bsplit bthe barc
arc bcontrol bfactors b- bcorrect banswer-reduced bhorns bwidth bminimize barc bx bsection
more bplates bsplit barc binto bmultiple bsmaller bvoltages
maximize barc bchute bincreases btravel bdistance bfor barc
Four bkey bparts bof bMCBs b- bcorrect banswer-A. btrip boperating bunit
B. bcontrol bcontacts bunit
C. barcing bext. bunit
D. bframe bunit
describe b(A. btrip boperating bunit b) bcomponent bfunction b- bcorrect banswer-bi-metal/mag.
bprovides bmechanism bfor bdetection bof bfault bcurrent band bopens bcontacts
describe b(B. bcontrol bcontacts bunit b) bcomponent bfunction b- bcorrect banswer-contacts
ballows bthe bsupply bcurrent bto bflow bduring bnormal brunning bwhen bMCB bis bclosed
