Update Questions | Verified Answers |
Already A+Grade!!!
AnZXACZXcircuitZXconsistsZXonlyZXofZXaZXpureZXinductanceZXandZXaZXpowerZXsource.ZXTheZXrelatio
nshipZXbetweenZXtheZXvoltageZXandZXtheZXcurrentZXinZXthisZXcircuitZXisZXthatZXtheZX-
ZXcurrentZXlagsZXtheZXvoltage
TheZXpowerZXfactorZXofZXaZXloadZXisZXequalZXtoZXthe powerZXdividedZXbyZXthe
power.ZX-ZXTrueZX;ZXapparent
AZX10-ohmsZXandZX20-
ohmsZXresistorZXareZXconnectedZXinZXparallel.ZXTheZXtotalZXlineZXcurrentZXdrawnZXbyZXthisZXparall
elZXcombinationZXisZX30ZXamps.ZXUnderZXtheseZXconditions,ZXtheZXlineZXvoltageZXwillZXbe
volts.ZX-ZX200
AZX20-
ohmZXresistorZXisZXconnectedZXinZXseriesZXwithZXaZXparallelZXcombinationZXofZXtwoZXresistors,Z X
oneZXofZXwhichZXisZX10-ohms,ZXtheZXotherZX40-
ohms.ZXIfZXtheZXvoltageZXacrossZXtheZXparallelZXcombinationZXisZX40ZXvolts,ZXtheZXvoltageZXacro
ssZXtheZX20-ohmZXseriesZXresistorZXis volts.
-ZX100
AZXcertainZX120-voltsZXsingle-
phaseZXACZXcircuitZXhasZXaZXpowerZXfactorZXofZX80ZXpercentZXandZXaZXwatt-
ZXmeterZXreadingZXofZX1150ZXwatts.ZXTheZXcurrentZXdrawnZXbyZXtheZXcircuitZXis amperes.ZX-
ZX12
IfZXtheZXvoltageZXbetweenZXlinesZXofZXaZX3-phase,ZX3-
wireZXdeltaZXconnectedZXsystemZXisZX2400ZXvolts,ZXthenZXtheZXphaseZXvoltageZXis voltsZX-
ZX2400
AZXcircuitZXconsistsZXofZXanZXinductiveZXreactanceZXofZX15ZXohmsZXandZXaZXresistorZXofZX20ZXo
hmsZXinZXseriesZXacrossZXaZX100-
volts,ZX60ZXcyclesZXACZXsupply.ZXTheZXcurrentZXinZXthisZXcircuitZXis
amperes.ZX-ZX4
AZX3ZXphase,ZX3ZXwire,ZX208ZXvolt,ZX60ZXcyclesZXACZXserviceZXsuppliesZXaZXbalancedZXloadZXcons
istingZXofZXthreeZX30ZXohmsZXresistorsZXconnectedZXwye.ZXTheZXlineZXcurrentZXunderZXtheseZXc
onditionsZXosZXMOSTZXNEARLY amperes.ZX-ZX6.9
IfZXtheZXlevelZXofZXtheZXelectrolyteZXinZXaZXleadZXacidZXstorageZXbatteryZXfallsZXbelowZXtheZXtopZXo
fZXtheZXplatesZXbecauseZXofZXevaporationsZXunderZXnormalZXoperatingZXconditions,ZXitZXisZXBES
TZXtoZXaddZX-ZXWater
,AZX600ZXvoltZXcartridgeZXfuseZXmustZXhaveZXknifeZXbladeZXcontactsZXifZXitsZXcurrentZXratingZXexcee
ds
amperes.ZX-ZX60
WhenZXtheZXmagnitudeZXofZXtheZXshortZXcircuitZXcurrentsZXinZXaZXfeederZXcircuitZXmustZXbeZXlimit
ed,ZXthisZXisZXUSUALLYZXaccomplishedZXbyZXmeansZXofZX-ZXreactors
,TheZXcrossZXsectionalZXareaZXinZXcircularZXmilsZXofZXaZXstandardZXcableZXhavingZX37ZXstrands,ZXe
achZXofZXwhichZXhaZXaZXdiameterZXofZX90ZXnils,ZXisZXMOSTZXNEARLYZX-ZX300,000
AZXcoilZXhavingZXanZXaverageZXdiameterZXofZX4ZXinchesZXisZXtoZXbeZXmadeZXupZXfromZXaZX1,26
0ZXftZXlongZXlengthZXofZXwire.ZXTheZXnumbersZXofZXturnsZXinZXthisZXcoilZXwillZXbeZXMOSTZXNEA
RLYZX-ZX1,200
TheZXdeviceZXcommonlyZXknownZXasZXaZXgrowlerZXisZXFREQUENTLYZXusedZXtoZX-
ZXtestZXDCZXarmatureZXwindingsZXforZXshorts
WhenZXaZXmeggerZXisZXappliedZXalternatelyZXtoZXtheZXtwoZXleadsZXofZXaZXdirectZXcurrentZXelect
rolyticZXcapacitor,ZXtheZXreadingZXwillZX-
ZXstartZXatZXzeroZXbutZXincreaseZXgraduallyZXforZXoneZXofZXtheZXconnections
TheZXdeviceZXusedZXtoZXconvertZXdirectZXcurrentZXtoZXalternatingZXcurrentZXisZXcalledZX-ZXinverters
OfZXtheZXfollowingZXconditions,ZXtheZXoneZXwhichZXisZXMOSTZXlikelyZXtoZXcauseZXflashingZXorZXex
cessiveZXarcingZXfromZXbrushZXtoZXbrushZXinZXaZXmotorZXisZX-
ZXExcessivelyZXhighZXvoltageZXonZXtheZXline
TheZXcurrentsZXinZXtheZXarmatureZXequalizerZXconnectionsZXinZXaZXDCZXgeneratorZXareZX-
ZXalternatingZXcurrents
AZXgeneratingZXstationZXhasZXoneZX1000ZXKwZXandZXtwoZX2000ZXKwZXgenerators.ZXToZXsupplyZX2
000ZXKwZXMOSTZXeconomically,ZXtheZXoperatingZXconditionsZXshouldZXbeZX-
ZXoneZX2000ZXKwZXgeneratorZXatZXfullZXload
TheZXterminalZXvoltageZXofZXaZXDCZXshuntZXgeneratorZXhavingZXanZXarmatureZXcurrentZXofZX1
00ZXamperes,ZXanZXarmatureZXresistanceZXofZX0.02ZXohms,ZXandZXaZXgeneratedZXE.M.FZXofZX2
22ZXvoltsZXisZXMOSTZXNEARLY volts.ZX-ZX220
TheZXnumberZXofZXpolesZXinZXtheZXfieldZXofZXanZXalternatorZXgeneratingZXvoltageZXatZXaZXfrequenc
yZXofZX60ZXcyclesZXperZXsecondZXwhileZXrotatingZXatZX1200ZXrpmZXisZX-ZX6
IfZXtheZXfieldZXofZXaZXshuntZXmotorZXopensZXwhileZXrunning,ZXtheZXmotorZXwillZX-ZXrunZXaway
ToZXreverseZXtheZXdirectionZXofZXrotationZXofZXaZXcumulativeZXcompoundZXmotor,ZXandZXnotZXhav
eZXitZXrunZXasZXaZXdifferentialZXcompoundZXmotor,ZXreverseZXtheZXconnectionsZXtoZXthe field.ZX-
ZXshuntZXfieldZXandZXtoZXtheZXseries
AZXmainZXcontributingZXfactorZXtoZXmotorZXstatorZXfailureZXusuallyZXisZX-ZXdirt
TheZXinputZXofZXaZXmotorZXisZX40,000ZXwattsZXandZXefficiencyZXisZX80ZXpercent.ZXTheZXTOTAL
ZXenergyZXlossZXis watts.ZX-ZX8,000
, TheZXfullZXloadZXcurrentZXofZXaZXthree-
phaseZX5ZXhpZXmotorZXoperatingZXatZX200ZXvolts,ZX60ZXcycles,ZXandZXhavingZXanZXefficiencyZXofZX
80ZXpercentZXandZXaZXpowerZXfactorZXofZX85ZXpercentZXisZXMOSTZXNEARLY
amperes.ZX-ZX14.4
OfZXtheZXfollowingZXmotors,ZXtheZXoneZXthatZXhasZXtheZXbestZXspeedZXregulationZXisZXtheZXmotor.ZX-
ZXshunt
TheZXfullZXloadZXspeedZXofZXaZX60-
cycleZX208ZXvolt,ZX3ZXphaseZXinductionZXmotorZXhavingZX6ZXpolesZXandZXoperatingZXwithZXaZXsli
pZXofZX10%ZXisZXMOSTZXNEARLY r.p.mZX-ZX1080
OfZXtheZXfollowing,ZXaZXMAJORZXadvantageZXofZXanZXACZXsynchronousZXmotorZXisZXthatZXit(s)ZX-
ZXcanZXbeZXusedZXforZXpowerZXfactorZXcorrection
IfZXtheZXfieldZXcurrentZXofZXaZXsynchronousZXmotorZXisZXincreasedZXtoZXaZXpointZXwhichZXmake
sZXtheZXsynchronousZXmotorZXoverexcited,ZXtheZX-ZXmotorZXwillZXtakeZXaZXleadingZXcurrent
WhenZXtransformersZXareZXtoZXbeZXoperatedZXinZXparallel,ZXitZXisZXNOTZXnecessaryZXthatZXthe
ZXtransformerZXhaveZXtheZXsameZX-ZXKVAZXrating
AZXtransformerZXratesZXatZX200ZXKVAZXisZXFULLYZXloadedZXwithZXaZXlaggingZXpowerZXfactorZX
ofZX80%ZXwhenZXitZXisZXsupplyingZX-ZX160ZXKW
IfZXtheZXcurrentZXinZXtheZXprimaryZXofZXaZXcurrentZXtransformerZXisZX500ZXamperesZXandZXtheZXtra
nsformerZXhasZXaZXratioZXofZX100ZXtoZX5,ZXanZXammeterZXconnectedZXtoZXtheZXsecondaryZXwillZXr
eadZXMOSTZXNEARLY amperes.ZX-ZX25
AssumeZXthatZXaZXswitchboardZXammeterZXwhichZXisZXconnectedZXtoZXaZXcurrentZXtransformerZ
XisZXdamagedZXandZXmustZXbeZXremovedZXwithoutZXinterruptingZXtheZXservice.ZXOfZXtheZXfollowi
ng,ZXanZXESSENTIALZXprecautionZXtoZXbeZXtakenZXbeforeZXdisconnectingZXtheZXammeterZXisZXto
ZX-ZXshortZXtheZXsecondaryZXofZXtheZXtransformer
AZXDCZXrelayZXisZXratedZXatZX6ZXvoltsZXandZX120ZXohms.ZXThisZXrelayZXcanZXbeZXoperatedZXfromZXaZX
120ZXvolt
lineZXbyZXconnectingZXaZX ohmZXresistanceZXinZX withZXrelayZX-
series
SomeZXrelaysZXareZXprovidedZXwithZXdash-pots.ZXTheZXFUNCTIONZXofZXtheseZXdash-
potsZXisZXtoZXprovideZX-ZXdelayedZXtimeZXaction
AnZXammeterZXhasZXaZXfullZXscaleZXdeflectionZXforZXaZXcurrentZXofZX0.01ZXamperesZXandZXanZXint
ernalZXresistanceZXofZX20ZXohms.ZXInZXorderZXtoZXhaveZXtheZXammeterZXreadZXfull-
scaleZXforZXaZXcurrentZXofZX10ZXamperesZXandZXnotZXdamageZXitsZXmovement,ZXaZXshuntZXshould
ZXbeZXusedZXhavingZXaZXvalue
of ohms.ZX-ZX0.02
AnZXairZXcircuitZXbreakerZXhasZXcontactsZXthatZXflash.ZXTheZXMOSTZXprobableZXcauseZXofZXthisZ
XtroubleZXisZXthatZXtheZX-ZXbarriersZXareZXbroken