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1. What name is given to the time-current relationship among a number of overcurrent devices connected in series?

Nonrenewable

Coordination

Switched

Dual-element

Question 1 of 15

2. Which of the following is defined by UL as a device that trips when a fault current to ground is 6mA or more?

Class B

Class A

Class H

Class R

Question 2 of 15

3. Why are single-element fuses particularly suited for the protection of circuit breakers with low interrupting ratings?

They can be used in circuits other than motor branch circuits and feeders, such as lighting circuits.

They have a low speed of response to short circuit currents.

They can be applied in circuits subject to temporary motor overload.

They have a high speed of response to overcurrents.

Question 3 of 15

4. Which of the following types of drawings helps when sizing fuses for a given application?

Floor plan

Single-line schematic

Large-scale detail

Building elevation drawing

Question 4 of 15

5. Which type of GFCI receptacle offers protection only at the point of installation?

Unlisted

Feed-through

Nonfeed-through

Solid-state

Question 5 of 15

6. NEC Article 240 covers which of the following?

Ampere rating

Overcurrent protection

Nontime-delay fuses

Plug fuses

Question 6 of 15

7. The normal current rating of a circuit breaker is located ________.

on the bottom

on the handle

on the side

in the panelbox

Question 7 of 15

8. In residential applications, the available ground fault circuit current is seldom higher than ________.

65,000A

15,000A

10,000A

5,000A

Question 8 of 15

9. What color is printed on the labels of standard interrupting capacity circuit breakers?

Red

White

Black

Blue

Question 9 of 15

10. Cartridge fuses used for branch circuit protection must be marked with the ampere rating, voltage rating, and the ________.

dimensions

expiration

date manufactured

interrupting rating

Question 10 of 15

11. The interrupting rating of an FH-type circuit breaker is ________.

10,000A

65,000A

30,000A

5,000A

Question 11 of 15

12. Circuit breakers are grouped for identification according to ________.

given current ranges

line and load terminals

solid-state circuitry

normal ambient temperatures

Question 12 of 15

13. A current-limiting circuit breaker performs in a manner similar to conventional thermomagnetic circuit breakers at currents below a threshold of about ________.

600A

1,000A

800A

700A

Question 13 of 15

14. The organization(s) that test and list circuit breakers is/are ________.

CSA and UL

IEEE

OSHA and NEMA

UL and NEMA

Question 14 of 15

15. The two most common types of overcurrent protective devices are ________.

circuit breakers and fuses

heaters and blowers

safety switches and load centers

Edison-base fuses and time-delay devices

Question 15 of 15

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