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Electrical Theory Test With All Answers.
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Electrical Theory Test With All Answers.
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Electrical Theory Test With All AnswersState vthe vpermissible vtest vresult vfor van vinsulation vresistance vtest vfor vthe
velectrical vinstallation vwith vALL vthe vpermanently-connected velectrical vequipment
vDISCONNECTED v- vcorrect vanswer-1 vMega vOhm
State vthe vpermissible vtest vresult vfor van vinsulation vresistance vtest vfor vthe
velectrical vinstallation vwith vALL vthe vpermanently-connected velectrical vequipment
vCONNECTED v- vcorrect vanswer-0.01 vMega vOhms
A vthree-phase vinduction vmotor vnormally vruns von vfull-load. vState vONE vreason
vwhy vthis vmotor vshould vnot vbe vrun vLIGHTLY vLOADED vwhen vit vruns von vfull
vload. v- vcorrect vanswer-- vThe vpower vfactor vof vthe vmotor vwill vbe vpoor
- vThe vmotor vwill vbe vless vefficient v
- vrunning vcosts vrise
, A vthree-phase vinduction vmotor vhas vbeen vOPERATING vNORMALLY vON vFULL-
LOAD. vThe vmotor vstarts vto vover-heat veven vthough vit vis vdrawing vthe vnormal vfull
vload vcurrent.
State vONE vreason vwhy vthis vsituation vwould voccur v- vcorrect vanswer-- vThe vmotor
vventilation vis vrestricted vin vsome vmanner
- vThe vcooling vfan vhas vbecome vdetached vfrom vthe vmotor vshaft
A vclip-on vammeter vis vbeing vused vto vtest vthe vintegrity vof vthe vinsulation vof va
vrepaired vClass vI velectrical vappliance, vwhile vthe vappliance vis vlive. vWhere von vthe
vappliance vwould vthe vclip-on vammeter vbe vused? vAlso vstate vthe vmaximum vtest
vresult vthat vwould vallow vthe vappliance vto vreturn vto vservice. v- vcorrect vanswer-
Clamped varound vthe vprotective vearthing vconductor vand v5mA
Explain vwhat vis vmeant vby vthe vterm vINVERSE vTIME-CURRENT
vCHARACTERISTIC vin vrelation vto vprotective vdevices v- vcorrect vanswer-as vcurrent
vthrough vthe vprotective vdevice vincreases, vthe vtime vtaken vto voperate vdecreases
State vTWO vcomponents vthat vare vtypically vused vto vsmooth vthe vd.c voutput vof va
vrectifier v- vcorrect vanswer-- vCapacitors
- vInductors v
- vResistors
The voutput vcircuit vof van vautotransformer vMUST vBE vinsulated vfor vthe vhighest
vinput vor voutput vvoltage vof vthe vautotransformer. vState vONE vreason vfor vthis
vrequirement v- vcorrect vanswer-An vauto vtransformer vcan vfail vin vsuch va vway vso
vthe vprimary vvoltage vappears vacross vthe vsecondary
An visolator vfor v230V velectrical vequipment vhas vbeen vreplaced. vDuring vthe vwork
vthe vphase v(active) vand vneutral vwere vaccidentally vtransposed vat vthe vsupply vside
vof vthe visolating vswitch.
What vpotential vdanger vwould vthis vtransposition vcreate? v- vcorrect vanswer-The
vinternal vcircuitry vof vthe velectrical vequipment vwould vbe vlive vwhen vthe visolating
vswitch vis vin vthe vOFF vposition.
What vto vthe vinitials vBJT vmean vwhen vapplied vto vsemiconductors v- vcorrect
vanswer-A vbi-polar vjunction vtransistor
State vthe vfunction vof va vtransducer v- vcorrect vanswer-A vdevice vthat vchanges
venergy vfrom vone vform vto vanother
State vTWO vrequirements vfor vgood villumination v- vcorrect vanswer-Any vTWO vof:
● vProvides vclear vvision vwithout veye vstrain
● vSufficient vlight vintensity
● vMinimum vglare
● vUniform vlight vintensity vthroughout vthe villuminated varea
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