NEIEP 400 Final Exam Version 2 (Latest 2023/ 2024 Update) Questions and Verified Answers| 100% Correct| Grade A

NEIEP 400 Final Exam Version 2 (Latest

2023/ 2024 Update) Questions and Verified

Answers| 100% Correct| Grade A

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?