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EWRB THEORY EXAM PREP MAIN GUIDE WITH COMPLETE SOLUTIONS.
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EWRB THEORY EXAM PREP MAIN GUIDE WITH COMPLETE SOLUTIONS.
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EWRB THEORY EXAMPREP MAIN GUIDE WITH
COMPLETE SOLUTIONS
What bis bthe bminimum bvalue bof bthe bpermitted btest bresult bfor bthe binsulation
bresistance btest bof ba bthree-phase, b400V, bmains bcable? b- bcorrect banswer-1MΩ
When bcarrying bout btesting bon ba blow bvoltage belectrical binstallation, bwhich
bdocument bdetails bthe btests band bchecks brequired bto bbe bcarried bout? b- bcorrect
banswer-AS/NZS b3000
What bis bthe bminimum bor bmaximum btest bresult bvalue byou bwould bconsider
bacceptable bfor ban bEarth bContinuity btest? b- bcorrect banswer-1Ω bor bless
State bTWO btypes bof belectrical bprotection bprovided bby ba bRCBO. b- bcorrect
banswer-ANY bTWO:
- bEarth bLeakage
- bOverload
- bShort bCircuit
If bthe bvoltage band bcurrent bare bknown, bwhat bTWO bother bfactors bare brequired bto
bcalculate bthe bpower bconsumed bby ba bthree-phase bmotor? b- bcorrect banswer-√3
b& bPower bFactor
, What btype bof bsingle-phase bmotor bcan bbe breversed bby breversing bthe
bconnections bto bthe brun bwinding? b- bcorrect banswer-ANY bONE:
- bSplit-Phase bMotor
- bCapacitor bStart bMotor
- bCap-Start, bCap-Run bMotor
What btype bof bsingle-phase bmotor bcan bbe breversed bby breversing bthe
bconnections bto bthe barmature bbrushes? b- bcorrect banswer-ANY bONE:
- bUniversal bMotor
- bSeries bMotor
State bONE breason bwhy bthe bmetal bframe bof ba bClass b1 belectrical bappliance bis
bearthed. b- bcorrect banswer-ANY bONE:
- bTo bensure bthe boperation bof ba bprotective bdevice bunder bfault bconditions. b
- bTo bkeep bthe bframe bof bthe bappliance bat bearth bpotential bunder bfault bconditions.
State bTWO bfactors bthat bdetermine bthe bseverity bof belectric bshock bupon bthe
bhuman bbody. b- bcorrect banswer-ANY bTWO:
- bVoltage bApplied
- bShock bCurrent bLevel
- bContact bDuration
- bSkin bDryness
- bCurrent bPath
You bhave bcarried bout ba btest bon ba blow bvoltage bfinal bsubcircuit bin ban belectrical
binstallation, bthe bresult bvalue bwas b20MΩ. bWhat btype bof btest bhas bbeen bcarried
bout? b- bcorrect banswer-Insulation bResistance bTest
State bthe bmain breason bwhy binterlocks bare bused bin ba bstar/delta bstarter. b-
bcorrect banswer-To bprevent bthe bstar band bdelta bcontractors bclosing
bsimultaneously b- band bcausing ba bshort bcircuit.
Calculate bthe bpower bfactor bof ba bsmall bthree-phase bprinting bfactory bwith bmainly
bmotor bloading. bMetering binstruments bhave brecorded bthe bfollowing:
Power b= b30000W
Voltage b= b406V
Current b= b57A bper bphase b- bcorrect banswer-0.748
pf b= bP/V×I×√3
Define bthe bterm bCUT bOFF bTIME bas bit brefers bto bHRC bfuses. b- bcorrect banswer-
ANY bONE:
- bPre-arcing bTime: bTime btaken bto bmelt bthe bfuse belements. b
- bArcing bTime: bThe btime btaken bbetween bthe binitiation bof bthe barc, band bthe barc
bextinguishing. b
- bCut bOff bCurrent: bThe bfault bcurrent bthat bwill bcause bthe bfuse bto bblow. b
- bTotal bClearing bTime: bThe btime bit btakes bto binterrupt bthe bflow bof bcurrent band
bextinguish bthe bflame.
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