Electrical Level 3 Transformers Questions with Correct Answers | Rated A+

Electrical Level 3 Transformers Questions
with Correct Answers | Rated A+
A three phase four wire system that has the advantage of providing three phase power and
allowing lighting to be connected between any of the secondary phases and the neutral would
have a __________? - CORRECT ANSWER -D.Wye secondary



What forces are always present in an AC circuit? - CORRECT ANSWER -Inductance and true
power



When voltage is stepped down in a transformer what happens to the current in the same
current? - CORRECT ANSWER -It is stepped up



What type of circuit uses the alternating magnetic field of one coil to generate voltage in a
second coil? - CORRECT ANSWER -...



Secondary voltage in a transformer can be increased or decreased by connecting various _____
- CORRECT ANSWER -Taps



Which winding of a transformer is connected to the load? - CORRECT ANSWER -Secondary



How can the need for additional KVAR's be reduced in large inductive loads with low power
factors? - CORRECT ANSWER -Installing capacitors



Which of the following best describes a transformer that increases the voltage on the primary
from 120v to 1200v on the secondary? - CORRECT ANSWER -A step up transformer



The installation of resistors and reactors is covered in______? - CORRECT ANSWER -NEC article
470

, What components are installed to increase the power factor and decrease the cost of electricity
caused by large inductive loads? - CORRECT ANSWER -Capacitors



Whatwtypewofwtransformerwprovidesw120vwbetweenwthewcenterwtappedwterminalwandweachwungro
undedwterminalwonweitherwsidewandw240vwacrosswthewfullwwindingwofweachwphase?w-
wCORRECTwANSWERw-Delta-Delta




Transformerwcoreswsupportw______w-wCORRECTwANSWERw-Twowwindings



Capacitorswarewcoveredwinw_______w-wCORRECTwANSWERw-NECwArticlew460



Whatwtypewofwtransformerwhaswprimarywcircuitswthatwhavewpartwofwawwindingwinwcommon?w-
wCORRECTwANSWERw-...




Awlaggingwcurrentwforwawmotorworwinductivewdevicewiswrepresentedwbywawpowerwfactorwofw_______
__?w-wCORRECTwANSWERw-Lesswthanwone



Whichwtransformerwiswalmostwalwayswrequiredwtowbewinstalledwinwawvault?w-wCORRECTwANSWERw-
Oil-insulated



Whatwtypewofwtransformerswhaswmorewturnswinwthewprimarywthanwthewsecondary?w-
wCORRECTwANSWERw-Stepwdown




WhichwsectionwofwthewNECwcontainswtransformerwnameplatewrequirements?w-
wCORRECTwANSWERw-NECwArticlew450.11




Towensurewmaximumwsafetywinwawcontrolwtransformerwthewsecondarywcontrolwcircuitwisw_____?w-
wCORRECTwANSWERw-Isolatedwfromwthewprimarywcircuit