NEIEP 405 & 410 exam with correct solutions

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NEIEP 405 & 410 exam with correct solutions

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2024/2025

Institution NEIEP 405 & 410

Module NEIEP 405 & 410

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NEIEP 405 & 410 exam with correct solutions

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NEIEP 405 & 410 exam with |! |! |! |! |! |!

correct solutions |!

what is the standard transformer efficiency - Correct answer ✔97.7% or
|! |! |! |! |! |! |! |! |! |! |!

greater

copper losses are - Correct answer ✔resistance of windings
|! |! |! |! |! |! |! |!

hysteresis losses - Correct answer ✔effort to change the domains in the iron
|! |! |! |! |! |! |! |! |! |! |! |! |!

core

hysteresis increases with - Correct answer ✔increase of frequency
|! |! |! |! |! |! |! |!

what type of transformer eliminates eddy currents and hysteresis - Correct
|! |! |! |! |! |! |! |! |! |! |!

answer ✔air core transformers
|! |! |!

how do you calculate efficiency in a transformer - Correct answer ✔power
|! |! |! |! |! |! |! |! |! |! |! |!

out /power in
|! |!

eddy currents are - Correct answer ✔waste currents induced in the core
|! |! |! |! |! |! |! |! |! |! |! |!

material creates heat |! |!

what does CEMF stand for? - Correct answer ✔Counter Electromotive force
|! |! |! |! |! |! |! |! |! |!

, what is CEMF? - Correct answer ✔the voltage that opposes the flow of supply
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current. "invisible resistance"
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how are eddy currents reduced? - Correct answer ✔by making core
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laminations as thin as possible |! |! |! |!

eddy currents and hysteresis are both examples of - Correct answer ✔iron
|! |! |! |! |! |! |! |! |! |! |! |!

losses

iron losses are affected by - Correct answer ✔frequency
|! |! |! |! |! |! |! |!

H represents - Correct answer ✔input
|! |! |! |! |!

X represents - Correct answer ✔output
|! |! |! |! |!

the single winding in an auto-transformer serves - Correct answer ✔as both
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the primary and secondary windings
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Open Delta is - Correct answer ✔a 3-Phase Transformer with 2 windings
|! |! |! |! |! |! |! |! |! |! |!

what is a capacitor? - Correct answer ✔a device made of 2 metal plates,
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capable of holding a charge even after the charging voltage is disconnected
|! |! |! |! |! |! |! |! |! |! |!

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Uploaded on: June 15, 2025
Number of pages: 5
Written in: 2024/2025
Type: Exam (elaborations)
Contains: Questions & answers

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