Lineman Electrical Theory and Principles

Question 1

According to Ohm's Law, if a circuit has a voltage of 120V and a resistance of 30 ohms, what is the current?

Accepted Answer

4 amps

Answer

2 amps

Answer

6 amps

Answer

8 amps

Question 2

What is the standard frequency of AC power in the United States?

Accepted Answer

60 Hz

Answer

25 Hz

Answer

50 Hz

Answer

120 Hz

Question 3

Which of the following best describes power factor in an AC circuit?

Accepted Answer

The ratio of true power to apparent power

Answer

The ratio of voltage to current

Answer

The resistance of the load in ohms

Answer

The phase angle in radians

Question 4

In a series circuit, if one component fails (opens), what happens to the rest of the circuit?

Accepted Answer

The entire circuit stops conducting

Answer

Current increases in remaining components

Answer

Voltage drops to zero across all components

Answer

Remaining components share the missing load

Question 5

What is the relationship between frequency and period of an AC waveform?

Accepted Answer

Period = 1 / Frequency

Answer

Period = Frequency × 2π

Answer

Frequency = Period × 60

Answer

Period = Frequency²

Question 6

Which unit is used to measure electrical resistance?

Accepted Answer

Ohm

Answer

Farad

Answer

Henry

Answer

Siemens

Question 7

In a parallel circuit, the total resistance is always:

Accepted Answer

Less than the smallest individual resistance

Answer

Greater than the largest individual resistance

Answer

Equal to the sum of all resistances

Answer

Equal to the average of all resistances