Lesson 9 Flashcards
Electricity, as a hazard, exposes workers to electric shock, electrocution, and ? .
Select one:
a. explosions
b. exposure incidents
c. oxygen-deficient atmosphere
d. suffocation
a. explosions
In 2014, what ratio of construction worker injuries resulted in death?
Select one:
a. 1 out of 5
b. 1 out of 50
c. 1 out of 100
d. 1 out of 1,000
a. 1 out of 5
A common and sometimes overlooked conductor is the surface or subsurface of ? .
Select one:
a. anchor plates
b. poles
c. substation bus work
d. the earth
d. the earth
Dry skin has a fairly high ? to electric current. But when the skin is moist or wet, it acts as a conductor.
Select one:
a. connection
b. inductance
c. reactance
d. resistance
d. resistance
Four factors that determine the severity of an electric shock through the body are current amount, path, frequency, and ? .
Select one:
a. ambient temperature/humidity
b. amount of voltage
c. length of time it flows
d. quality of contact to ground
c. length of time it flows
Slight shock felt; not painful but disturbing. Average individual can let go.
These reactions best describe a current flow of ? . Select one: a. 5 mA b. 15 mA c. 20 mA d. 30 mA
a. 5 mA
Extreme pain, respiratory arrest, severe muscular contractions. Death is possible.
These reactions best describe a current flow of ? to 150 milliamperes. Select one: a. 6.3 b. 12.6 c. 25 d. 50
d. 50
An electrical accident can result in ? , such as electrical, arc, or thermal.
Select one:
a. burns
b. explosions
c. HAZMAT conditions
d. mechanical failure
a. burns
During an electrical shock, the ? often causes the muscles to contract.
Select one:
a. electrical stimulation
b. environmental condition
c. location of the exit wound
d. moisture content of the skin
a. electrical stimulation
Electrical shocks can cause involuntary muscle reactions. These reactions can result in a wide range of injuries from collisions or ? .
Select one:
a. blindness
b. falls
c. lockjaw
d. nerve spasticity
b. falls
A victim of a severe shock may suffer internal hemorrhages and destruction of tissues, nerves, and muscles that are not ? .
Select one:
a. life threatening
b. readily visible
c. treatable
d. very serious
b. readily visible
Most electrical accidents result from unsafe equipment, unsafe environment, and unsafe work practices.
Select one:
True
False
True
Grounding is normally a secondary protective measure to protect against electrical shock. Grounding does not guarantee you will not get a shock from electrical current.
Select one:
True
False
True
Components designed to protect conductors and equipment from overheating by opening the circuit when there is a risk of a ground fault are ? .
Select one:
a. fuses and circuit breakers
b. fuses and tap changers
c. sectionalizers
d. transformers and voltage regulators
a. fuses and circuit breakers
Devices designed to interrupt the flow of electricity within 1/40th of a second are called ? .
Select one:
a. air-blast circuit breakers
b. ground fault circuit interrupters
c. oil-filled circuit breakers
d. oil-filled circuit reclosers
b. ground fault circuit interrupters
A properly installed grounding conductor has a low resistance to ground and greatly reduces the amount of ? .
Select one:
a. current passing through the body
b. current that passes to ground
c. current the circuit can carry
d. resistance to electrical
a. current passing through the body
Conductors and parts of electric equipment not deenergized using procedures defined in OSHA 1910.269(d) “Hazardous Energy Control” or OSHA 1910.269(m) “Deenergizing Lines and Equipment for Employee Protection” must be treated as ? .
Select one:
a. a hazard
b. conductive
c. energized
d. isolated
c. energized
If you work in an area where there are potential electrical hazards, your employer must provide you with protective equipment.
Select one:
True
False
True
All employees who work with electrical power generation, transmission, and distribution must be properly trained in the safety-related work practices involved.
Select one:
True
False
True
When a “system operator” is in charge of a circuit, and a crew needs the circuit de-energized, the person responsible for the clearance is the ? .
Select one:
a. designated employee who requested the clearance
b. division manager
c. general foreman who is with the crew
d. working foreman
a. designated employee who requested the clearance
Grounding jumpers used on a transmission or distribution circuit must be ? .
Select one:
a. insulated to the values of the line on which they are being applied
b. made up of a four-conductor set of tinned copper leads with alligator clipends
c. no larger than 4 AWG copper four-conductor
d. of a size capable of conducting the maximum fault current for the time necessary to clear the fault
d. of a size capable of conducting the maximum fault current for the time necessary to clear the fault
Breakers used in wet locations, construction sites, and other high risk areas as a means of circuit protection must be of the ? type.
Select one:
a. AFCI
b. GFCI
c. GFI
d. GFPP
b. GFCI
A breaker required to be used in wet locations automatically shuts off the electric power with as little as ? .
Select one:
a. 5 mA
b. 10 mA
c. 15 mA
d. 20 mA
a. 5 mA
Using listed and labeled portable tools protected by a system of single insulation is a form of incorporated protection designed to protect personnel against electrical shock.
Select one:
True
False
False
