Journeyman Electrician’s Exam Journeyman Electrician's Basic Formula 4

Question 1

A motor nameplate reads 5 HP and operates at 240V single-phase with 90% efficiency. Approximately how many amps does it draw?

Accepted Answer

17.2 A

Answer

15.5 A

Answer

20.9 A

Answer

23.2 A

Question 2

Voltage drop in a conductor is calculated using which formula?

Accepted Answer

VD = I × R

Answer

VD = I / R

Answer

VD = V / I

Answer

VD = R / I

Question 3

The NEC maximum allowable voltage drop for a branch circuit is:

Accepted Answer

3%

Answer

5%

Answer

10%

Answer

1%

Question 4

What is the cross-sectional area formula used when calculating minimum wire size for a given load?

Accepted Answer

A = ρ × L / R

Answer

A = ρL / R

Answer

A = R × L / ρ

Answer

A = V × L / I

Question 5

A 120V, 20A circuit feeds a continuous load. What is the maximum continuous load allowed by the NEC?

Accepted Answer

1,920 W

Answer

2,400 W

Answer

1,800 W

Answer

2,000 W

Question 6

What is the total impedance of a series AC circuit with 6Ω resistance and 8Ω inductive reactance?

Accepted Answer

10 Ω

Answer

14 Ω

Answer

48 Ω

Answer

2 Ω

Question 7

Power factor is defined as the ratio of:

Accepted Answer

True power to apparent power

Answer

Apparent power to reactive power

Answer

Reactive power to true power

Answer

Voltage to current

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