NEIEP 400 Final Exam Version 2 (Latest 2024 / 2025 Update) Questions and Verified Answers | 100% Correct | Grade A
Question:
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.
Question:
What is correct regarding the transformer?
Answer:
applied voltage on the primary leads current by 90 degrees
Question:
What does two solid lines between two coils represent in a transformer?
Answer:
Iron core transformer 1 / 4
Question:
What statement best describes CEMF?
Answer:
it opposes the applied voltage
Question:
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.
Question:
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.
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Question:
What is the power available from a 68Kva transformer connected in open delta configuration?
Answer:
39.44 Kva
Question:
the secondary winding of a 11,000 volt to 220 volt transformer has 50 windings on the secondary. How many turns are on the primary winding?
Answer:
2,500 turns
Question:
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
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Question:
what is correct regarding current in transformers?
Answer:
the current ratio of transformation is the opposite of the voltage ratio transformation.
Question:
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
Question:
What statement best describes eddy currents?
Answer:
eddy currents effect solid cores less than laminated cores.
Question:
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%
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