Job Information Level 1: Lesson 7 Electrical Safety

Question 1

Which of the following is not a hazard that can be created by electrical power?
Select one:

a.
Arc blasts and arc burns

b.
Electrocutions

c.
Heat materials to a point that creates combustion

d.
Ignite combustible vapors

e.
Spontaneous combustion

Answer 1

Spontaneous combustion

Question 2

How often do electrocutions occur in the United States?
Select one:

a.
1 per day

b.
1 per week

c.
1 per month

d.
3 per week

Answer 2

1 per day

Question 3

What are the two outcomes to an electric shock?

I. The victim dies from the shock.
II. The victim has a greater likelihood of getting radiation poisoning.
III. The victim may experience heart issues for up to one month.
IV. The victim survives and has some discomfort for a short duration.
Select one:

a.
I. and II.

b.
II. and III.

c.
I. and IV.

d.
III. and IV.

Answer 3

I. and IV.

Question 4

Occupational Safety & Health Administration (OSHA) places the threshold voltage of electric shock at ? .
Select one:

a.
25 V

b.
50 V

c.
75 V

d.
100 V

Answer 4

50 V

Question 5

What is the limited approach boundary distance for an exposed fixed circuit part on a 480Y/277-volt distribution panel?
Select one:

a.
2’6”

b.
3’0”

c.
3’6”

d.
4’0”

Answer 5

3’6”

Question 6

One of the main directives of OSHA and NFPA 70E is to work ? circuits whenever possible.
Select one:

a.
deenergized

b.
energized

Answer 6

deenergized

Question 7

The apprentice and the ? are both responsible for being up to date on the regulations as they apply to current safety practices.
Select one:

a.
employer

b.
JATC

c.
local union

d.
training director

Answer 7

employer

Question 8

To ensure adequate protection, a(n) ? must be calculated on the basis of the amount of current present if a short circuit occurs, the time the arc is allowed to burn, and the distance the worker is from the arc.
Select one:

a.
distribution equipment evaluation

b.
electrical shock boundary

c.
flash hazard analysis

d.
selective coordination study

Answer 8

flash hazard analysis

Question 9

Which National Fire Protection Association (NFPA) document covers safe working practices for electrical work?
Select one:

a.
NFPA 70E

b.
NFPA 72

c.
NFPA 99

d.
NFPA 101

Answer 9

NFPA 70E

Question 10

LOTO is short for “lockout/tag-on.”
Select one:
True
False

Answer 10

False

Question 11

Which of the following are categories for shock protection approach boundaries to energized conductors or circuit parts?
I. Approved approach
II. Limited approach
III. Nominal approach
IV. Restricted approach
Select one:

a.
I., II., and III

b.
I., II., and IV.

c.
II. and III.

d.
II. and IV.

Answer 11

II. and IV.

Question 12

Arc blast is a hazard of working on live parts.
Select one:
True
False

Answer 12

True

Question 13

Temperatures as high as ? Fahrenheit can occur during an arc flash or arc blast.
Select one:

a.
10,000°

b.
25,000°

c.
35,000°

d.
50,000°

Answer 13

35,000°

Question 14

The extreme heat and light which can occur while working on live parts is known as the ? .
Select one:

a.
arc flash

b.
radiant temperature

c.
shock blast

d.
none of the above

Answer 14

arc flash

Question 15

Flame-resistant clothing is designed for the amount of heat that could be present. This heat is expressed in calories per square centimeter of “incident energy.”
Select one:
True
False

Answer 15

True

Question 16

The flash protection boundary is the distance rating that refers to how far you must be away from the flash to sustain a burn that is “just curable,” according to OSHA.
Select one:
True
False

Answer 16

True

Question 17

The purpose of a fuse or circuit breaker is to protect the premise from fire caused by overheating wiring or from ignition due to a(n) ? circuit.
Select one:

a.
closed

b.
open

c.
short

d.
unrated

Answer 17

short

Question 18

An Arc Fault Circuit Interrupter (AFCI) is a device that monitors both the amount of current leaving the source and the amount of current returning to the source.
Select one:
True
False

Answer 18

False

Question 19

A(n) ? GFCI requires the amount of current leaving the source and returning to the source to be within 5 mA of each other.
Select one:

a.
Class A

b.
Class B

c.
Class C

d.
Class D

Answer 19

Class A

Question 20

An AFCI is designed to determine if there is an arc that could start a fire in the protected circuitry.
Select one:
True
False

Answer 20

True