Practice test

Electrician Practice Exam 2

Test your electrician knowledge with 25 free foundation questions on grounding, Ohm's law load math, and NEC code. Get your score and detailed explanations.

These questions are for study practice only and are not official exam questions.

Question 1

1

Which of the following is recognized as a grounding electrode by the NEC?

Question 2

2

A concrete-encased electrode (Ufer ground) typically consists of at least 20 ft of:

Question 3

3

When more than one grounding electrode is present at a building, they must be:

Question 4

4

The equipment grounding conductor for a 20-ampere branch circuit using copper is sized per Table 250.122 at a minimum of:

Question 5

5

Two driven ground rods used to satisfy the supplemental-electrode rule must be spaced at least:

Question 6

6

Why must the metal frame of a household clothes dryer be connected to an equipment grounding conductor?

Question 7

7

A driven ground rod must generally be at least how long?

Question 8

8

The main bonding jumper connects which two items in service equipment?

Question 9

9

Ohm's law expresses the relationship between voltage, current, and resistance as:

Question 10

10

A circuit has 24 volts across a 6-ohm resistor. The current is:

Question 11

11

After the first 3,000 VA, the next portion of dwelling general lighting load (3,001 to 120,000 VA) is taken at what demand factor?

Question 12

12

A 240-volt single-phase load draws 30 amperes. Its apparent power is:

Question 13

13

What minimum service or feeder size is required for a one-family dwelling by the NEC?

Question 14

14

How many volt-amperes does a single 20-ampere, 120-volt branch circuit provide?

Question 15

15

In a series circuit, the total resistance is found by:

Question 16

16

A 12 AWG copper conductor has a typical 60 deg C ampacity from Table 310.16 of:

Question 17

17

Tamper-resistant receptacles are required in which of the following locations?

Question 18

18

AFCI protection is primarily intended to protect against:

Question 19

19

How does the NEC handle the number of 15-ampere general-use receptacle outlets on one dwelling circuit?

Question 20

20

A 'multiwire branch circuit' shares which conductor among two or more ungrounded conductors?

Question 21

21

Working space in front of electrical equipment operating at 0-150 V to ground (Condition 1) must be at least:

Question 22

22

The disconnecting means for an air conditioner must be located:

Question 23

23

Outdoor receptacle outlets are required at a one-family dwelling at:

Question 24

24

Conductors entering a panelboard or box must be protected from abrasion by:

Question 25

25

A 'home run' refers to the cable or raceway that runs:

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