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NEIEP 400 Final Exam Version 2 ( 2026/2027 Update) Questions and Answers
NEIEP 400 Final Exam Version 2 (
2026/2027 Update) Questions and
Answers
Q: What is the result of connecting an ammeter to the terminals of a power supply or other
voltage source?
Answer:
The meter will be damaged.
Q: What is correct regarding the transformer?
Answer:
applied voltage on the primary leads current by 90 degrees
Q: What does two solid lines between two coils represent in a transformer?-
Answer:
Iron core transformer
Q: What statement best describes CEMF?
Answer:
it opposes the applied voltage
Q: In figure 2 what will be the phase relationship between the primary and secondary voltages?
(figure two is a picture of an iron core transformer with one dot to the top left of the iron core
symbol and another dot to the bottom right of the core symbol)
Answer:
The secondary voltage will be 180 degrees out of phase.
Q: Which type of transformer would be used to prevent noise from being fed back to the line
without changing the voltage levels?
Answer:
Isolation transformer.
Q: What is the power available from a 68Kva transformer connected in open delta
configuration?
Answer:
39.44 Kva
Q: the secondary winding of a 11,000 volt to 220 volt transformer has 50 wind- ings on the
secondary. How many turns are on the primary winding?
Answer:
2,500 turns
Q: A transformer has 728 turns on the primary winding and 56 turns on the secondary. with 120
volts applied on the primary, what is the output voltage on the secondary?
Answer:
9.23 volts
Q: what is correct regarding current in transformers?
Answer:
the current ratio of trans- formation is the opposite of the voltage ratio transformation.
Q: A transformer has a primary voltage of 440 voltage with 100 turns and a
15:1 voltage ratio of transformation. with a primary current of 25 amps, what will be the current
in the secondary?
Answer:
44 amps
Q: What statement best describes eddy currents?
Answer:
eddy currents effect solid cores less than laminated cores.
Q: with the following values Ep=208 vac, Es=35 vac, Ip= 3.8 amps, Is= 21.42 amps, what is
the efficiency of this transformer?
Answer:
96%
Q: which of the following would describe a transformer with a fixed voltage transformation
ratio of 1:12?
Answer:
Step-up transformer
Q: Which of the following would describe a transformer with a primary current of 27 amps and
a secondary current of one amp?
Answer:
step down transformer
Q: how are primary windings on a transformer identified?
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