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

Dual-element

Switched

Nonrenewable

Coordination

Question 1 of 15

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

10,000A

30,000A

5,000A

65,000A

Question 2 of 15

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

They have a high speed of response to overcurrents.

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

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

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

Question 3 of 15

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

White

Black

Blue

Red

Question 4 of 15

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

interrupting rating

dimensions

date manufactured

expiration

Question 5 of 15

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

circuit breakers and fuses

Edison-base fuses and time-delay devices

safety switches and load centers

heaters and blowers

Question 6 of 15

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

OSHA and NEMA

IEEE

CSA and UL

UL and NEMA

Question 7 of 15

8. NEC Article 240 covers which of the following?

Plug fuses

Overcurrent protection

Ampere rating

Nontime-delay fuses

Question 8 of 15

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

Building elevation drawing

Large-scale detail

Floor plan

Single-line schematic

Question 9 of 15

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

700A

800A

600A

1,000A

Question 10 of 15

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

15,000A

10,000A

5,000A

65,000A

Question 11 of 15

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

on the handle

on the side

on the bottom

in the panelbox

Question 12 of 15

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

given current ranges

normal ambient temperatures

line and load terminals

solid-state circuitry

Question 13 of 15

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

Nonfeed-through

Unlisted

Solid-state

Feed-through

Question 14 of 15

15. 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 H

Class R

Class A

Question 15 of 15

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