An arc flash can occur where differences of potential _____ exists.
Voltage
Amperage
Incidence
Ohms
answer
Voltages
question
Of the burns caused by electricity, which type is the result of an explosion near the body that can generate heat up to four times hotter than the sun?
Electrical
Caustic
Arc
Thermal
answer
Arc or flash burns result from high temperatures caused by an electric arc or explosion near the body which creates intense heat and may even cause an explosion. The heat generated can be up to six times the amount of heat produced from other thermal sources, such as flash fires. This type of injury requires attention immediately.
question
According to statistics, what is the most common electricity-related direct injury?
Death
Burns
Falls
Electrocution
answer
The most common electricity-related injury is a burn. They occur when a person touches electrical wiring or equipment that is improperly used or maintained.
question
The need for electrical safety awareness is demonstrated by the fact that out of every 100 young workers who die on the job, _____ are killed by electricity.
5
12
100
33
answer
5
question
In which of the following situations can a flexible or extension cord be used?
To cross an open area
Inside a wall, using conduit
If hanged from nails or staples
To pass through a hole in the wall
answer
Flexible wiring should not be used where inspection would be difficult or where damage would be likely. Flexible cords must not be run through holes in walls, ceilings, or floors, run through doorways, windows, or similar openings (unless physically protected), or hidden in walls, ceilings, floors, conduit, or other raceways.
question
In order to minimize the risk of accidents around power lines
answer
Do not use metal ladders
Assume that power lines are energized
Stay at least 10 feet away from power lines
Use wood or fiberglass ladders
do not stay at least 20 feet away from power lines
do not test the power line to check if it is energized
do not insert a grounding electrode before digging in case buried wires exist
question
Which one of the following circuit interrupts is most effective at preventing major shocks?
Ring ground
Circuit breaker
GFCI
Fuse
answer
GFCI is the right answer because others cannot shut down electricity immediately.
question
Rita's employer uses an AEGCP at each construction site. It is April 26, and as Rita gathers her power tool flexible cords to begin the day, she notices the inspector's tape is white. By the tape's color, Rita knows the cord was inspected at the beginning of _____.
July
October
April
January
answer
When an assured equipment grounding conductor program is used to protect employees on construction sites, daily visual inspection for damage of equipment connected by cords and plugs before use must be conducted by a competent person. The color code divides the inspection system into subsequent quarters designated by white, green, red, and orange
January
question
A worker comes in contact with live electrical parts and is shocked but receives no major injuries. What would be the MOST LIKELY reason he suffered no electricity-related injuries?
His coworker performed CPR.
He was wearing nonconductive safety shoes.
He was on a dry surface.
He was very thin.
answer
He was wearing nonconductive safety shoes.
question
Effective training of employees includes all of this information EXCEPT:
How to keep cords, cables, and electric tools in good repair
How to operate power tools in wet conditions
How to drain electric equipment before inspection or repair
How to follow lockout/tag out procedures
answer
Employers should train all employees to de-energize or drain electrical equipment before inspection or repair, keep all electrical equipment in good repair, follow lockout/tagout procedures, and never operate power tools in wet conditions.
question
If ground fault is detected, a GFCI shuts off electricity in _____ of a second.
1/20th
1/10th
1/40th
1/12th
answer
If a ground fault is detected, a GFCI shuts off electricity in 1/40th of a second.
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