EIAT and NEIEP Test FREE NEIEP Electrical Theory Questions and Answers 2 — Questions and Answers
Question 1: What is the standard frequency of AC power in the United States?
- 60 Hz (Correct answer)
- 50 Hz
- 120 Hz
- 400 Hz
Correct answer: 60 Hz
The US standard AC power frequency is 60 hertz (Hz), meaning the current alternates direction 60 times per second.
Question 2: What does a transformer do in an electrical system?
- Changes AC voltage from one level to another (Correct answer)
- Converts AC to DC
- Stores electrical energy
- Measures electrical current
Correct answer: Changes AC voltage from one level to another
A transformer uses electromagnetic induction to step up or step down AC voltage levels.
Question 3: Which wire color is used for the neutral conductor in standard US residential wiring?
- White (Correct answer)
- Black
- Green
- Red
Correct answer: White
In US residential wiring, the white wire is the neutral conductor, which carries current back to the source.
Question 4: What does a fuse do in an electrical circuit?
- Interrupts the circuit if current exceeds a safe level (Correct answer)
- Boosts the voltage in the circuit
- Reduces resistance in the circuit
- Converts electrical energy to light
Correct answer: Interrupts the circuit if current exceeds a safe level
A fuse contains a metal element that melts when excess current flows, breaking the circuit to prevent damage or fire.
Question 5: What is the difference between AC and DC current?
- AC periodically reverses direction; DC flows in one direction only (Correct answer)
- AC flows in one direction; DC reverses direction
- AC is used in batteries; DC is used in outlets
- AC has no voltage; DC has constant voltage
Correct answer: AC periodically reverses direction; DC flows in one direction only
Alternating current (AC) reverses its flow direction periodically, while direct current (DC) flows continuously in one direction.
Question 6: What is a ground fault?
- An unintended connection between an energized conductor and ground (Correct answer)
- A broken ground wire
- Excess voltage in a circuit
- A short circuit between two hot wires
Correct answer: An unintended connection between an energized conductor and ground
A ground fault occurs when electrical current flows along an unintended path to ground, posing a serious shock hazard.
EIAT and NEIEP Test FREE NEIEP Electrical Theory Questions and Answers 2
What is the standard frequency of AC power in the United States?