ETC ETC Electrical & Electronic Systems

Question 1

What is the standard US residential single-phase voltage supplied to most homes?

Accepted Answer

120/240 V

Answer

208/480 V

Answer

277/480 V

Answer

120/208 V

Question 2

Which electrical code governs the installation of electrical wiring and equipment in the United States?

Accepted Answer

NFPA 70 (NEC)

Answer

OSHA 29 CFR 1910

Answer

IEEE 519

Answer

ANSI C84.1

Question 3

In Ohm's Law, if a circuit has a voltage of 120 V and a resistance of 60 ohms, what is the current?

Accepted Answer

2 A

Answer

0.5 A

Answer

7200 A

Answer

60 A

Question 4

What does GFCI stand for in electrical safety?

Accepted Answer

Ground Fault Circuit Interrupter

Answer

General Fault Current Indicator

Answer

Grounded Fixture Circuit Isolator

Answer

Ground Frequency Current Inspector

Question 5

What is the purpose of a disconnect switch in an electrical panel?

Accepted Answer

To safely de-energize a circuit for maintenance

Answer

To boost voltage to connected equipment

Answer

To convert AC to DC power

Answer

To measure power factor

Question 6

Which wire color in standard US wiring indicates the neutral conductor?

Accepted Answer

White

Answer

Black

Answer

Green

Answer

Red