Job Information Level 1: Lesson 8 Understanding The Function and Design of Ground-Fault Interrupters

Question 1

What are two recognized means of preventing injury during electrical equipment operations?

I. Grounding
II. Insulation
III. Testing with an ohmmeter
IV. Wearing gloves

Select one:

a.
I. and II.

b.
I. and III.

c.
II. and III.

d.
II. and IV.

Answer 1

I. and II.

Question 2

The metal housing of a drill-motor is a(n) ? (conductor/insulator).
Select one:

a.
conductor

b.
insulator

Answer 2

conductor

Question 3

Double insulation on a drill will guarantee protection and safe usage of the drill.
Select one:
True
False

Answer 3

False

Question 4

If a “hot” wire contacts a grounded enclosure, a(n) ? results.
Select one:

a.
ground-fault

b.
leakage current

c.
nuisance tripping

d.
overload

Answer 4

ground-fault

Question 5

The ? is a fast-acting circuit breaker that senses small imbalances in the circuit caused by current leakage to ground and in a fraction of a second shuts off the electricity.
Select one:

a.
AFCI

b.
Fuse

c.
GFCI

d.
OCPD

Answer 5

GFCI

Question 6

The GFCI ? protect the employee from line-to-line contact hazards.
Select one:

a.
will

b.
will not

Answer 6

will not

Question 7

Which of the following is not a potential problem that can occur with portable electric tools which might expose a worker to electrical shock?
Select one:

a.
Damage to insulation from hard usage

b.
Deterioration of insulation from aging

c.
Heavy moisture conditions

d.
Double insulated portable electric tools

Answer 7

Double insulated portable electric tools

Question 8

Generally, flexible cords are ? vulnerable to damage than fixed wiring.
Select one:

a.
more

b.
less

Answer 8

more

Question 9

Which of the following can cause tripping of GFCIs on a jobsite?
Select one:

a.
Cumulative leakage from several tools

b.
Exposure of connectors and tools to excessive moisture

c.
Leakages from extremely long circuits

d.
Any of the above

Answer 9

Any of the above

Question 10

The assured equipment grounding conductor program covers ? .
Select one:

a.
all cord sets

b.
equipment connected by cord and plug that is available for use

c.
receptacle not part of the permanent wiring of the building

d.
all of the above

Answer 10

all of the above

Question 11

While on a construction site, an extension cord is plugged into an outlet that is a permanent part of the building wiring; the receptacle on the end of the extension cord is not, and therefore must be GFCI protected.
Select one:
True
False

Answer 11

True

Question 12

When leakage current exceeds ? , a GFCI will trip.
Select one:

a.
1 mA +/− 1 mA

b.
3 mA +/− 1 mA

c.
5 mA +/− 1 mA

d.
10 mA +/− 1 mA

Answer 12

5 mA +/− 1 mA

Question 13

GFCIs can be used as a substitute for the grounding requirements of the OSHA safety and health rules and regulations specified in 29 CFR 1926.
Select one:
True
False

Answer 13

False

Question 14

A written description of the employer’s assured equipment grounding conductor program, including the specific procedures adopted, must be ? .
Select one:

a.
carried by each employee

b.
carried by the foreman

c.
filed with the property owner

d.
kept at the jobsite

e.
all of the above

Answer 14

kept at the jobsite

Question 15

How often must equipment be inspected under the equipment grounding conductor program?
Select one:

a.
Before each day’s use

b.
Each time a portable power tool is used

c.
Once a week

d.
Once a month

Answer 15

Before each day’s use

Question 16

What tests are required by OSHA under the assured equipment grounding conductor program?

I. A continuity test to ensure that equipment grounding conductors are electrically continuous
II. A strain test on all cord caps, plugs, and receptacles to ensure conductor continuity is maintained
III. A test of receptacles and plugs to ensure that the equipment grounding conductor is connected to its proper terminal
IV. All of the above
Select one:

a.
I. and II.

b.
I. and III.

c.
II. and III.

d.
IV.

Answer 16

I. and III.

Question 17

When do the tests required by OSHA under the assured equipment grounding conductor program take place?
Select one:

a.
After any repairs

b.
After damage has been suspected to have occurred

c.
At three-month intervals

d.
Before first use

e.
Cord sets and receptacles essentially fixed and not exposed to damage at regular intervals not to exceed six months

f.
All of the above

Answer 17

All of the above