NEIEP 405 & 410 Exam Questions &
Answers4
what is the standard transformer efficiency - ANSWERS-97.7% or greater
copper losses are - ANSWERS-resistance of windings
hysteresis losses - ANSWERS-effort to change the domains in the iron core
hysteresis increases with - ANSWERS-increase of frequency
what type of transformer eliminates eddy currents and hysteresis - ANSWERS-air core
transformers
how do you calculate efficiency in a transformer - ANSWERS-power out /power in
eddy currents are - ANSWERS-waste currents induced in the core material creates heat
what does CEMF stand for? - ANSWERS-Counter Electromotive force
what is CEMF? - ANSWERS-the voltage that opposes the flow of supply current. "invisible
resistance"
how are eddy currents reduced? - ANSWERS-by making core laminations as thin as possible
Answers4
what is the standard transformer efficiency - ANSWERS-97.7% or greater
copper losses are - ANSWERS-resistance of windings
hysteresis losses - ANSWERS-effort to change the domains in the iron core
hysteresis increases with - ANSWERS-increase of frequency
what type of transformer eliminates eddy currents and hysteresis - ANSWERS-air core
transformers
how do you calculate efficiency in a transformer - ANSWERS-power out /power in
eddy currents are - ANSWERS-waste currents induced in the core material creates heat
what does CEMF stand for? - ANSWERS-Counter Electromotive force
what is CEMF? - ANSWERS-the voltage that opposes the flow of supply current. "invisible
resistance"
how are eddy currents reduced? - ANSWERS-by making core laminations as thin as possible
