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NEIEP 400 Final Exam Version 1 ( 2026/2027 Update) Questions and Answers
NEIEP 400 Final Exam Version 1 ( 2026/
2026 Update) Questions and Answers
Q: What is the power available from a 68 kVA transformer connected in open delta configuration ?
Answer:
39.44 kVA
Q: The secondary winding of an 11,000 volt to 220 volt transformer has 50 windings on the
secondary How many turns are on the primary winding
?
Answer:
2500 turns
Q: A transformer has 728 turns on the primary winding and 56 turns on the secondaryWith 120
volts applied on the primary , what is the output voltage on the secondary ?
Answer:
9.23 volts
Q: A transformer has a primary voltage of 440 V with 100 turns and a 15:1 voltage ratio of
transformation .With a primary current of 25 amps , what is the current in the secondary ?
Answer:
375 amps
Q: Which statement best describes eddy currents ?
Answer:
They are circulating cur- rents set up by magnetic induction .
Q: With the following values : Ep = 208VAC ; Es = 35 VAC ;Ip = 3.8 amps ; Is
= 21.42 amps , what is the efficiency of this transformer ?
Answer:
95 %
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 1 amp ?
Answer:
Step - down transformer
Q: Which statement is correct regarding transformers?
Answer:
The primary winding terminals are identified with the letter H
Q: Refer to the figure .What type of transformer is represented?
Answer:
Core type
with a wye primary and delta secondary
Q: Which would you do to check for an open primary winding ?
Answer:
Measure the resistance across the primary
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