Brain Boosters: Comprehensive 63 Question Collection With Answers for The Guidebook for Lineman and Cableman Chapter 7
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Course
Lineman and Cableman
Institution
Lineman And Cableman
Above what amperage is usually fatal? - ️️100 mAmps
At what amperage can a person's heart go into fibrillation? - ️️50mA (0.05A)
Can current and resistance change in a branch of a parallel circuit and not affect the other branches? - ️️Yes
Can induced current occur from an RF/MF tran...
Above what amperage is usually fatal? - ✔ ✔ 100 mAmps
At what amperage can a person's heart go into fibrillation? - ✔ ✔ 50mA (0.05A)
Can current and resistance change in a branch of a parallel circuit and not affect the other branches? -
✔ ✔ Yes
Can induced current occur from an RF/MF transmitter? - ✔ ✔ Yes and it has the same effects as
induction from a powerline.
How can Static Electricity be generated? - ✔ ✔ By rubbing two nonconductive substances together.
How high is the risk from Cancer being exposed to EMF compared to smoking, diet, or sunlight? - ✔ ✔
Extremely low
In an electrical circuit all the current must return to the source. On a single-phase wye circuit, how does
the current return? - ✔ ✔ All the current returns by the way of the neutral and the ground. 2/3rds
through the neutral. 1/3 through the earth.
In what situations are minimum approach distances used: - ✔ ✔ All situations, qualified or
unqualified.
Is a circuit dead when it has been isolated and grounded? - ✔ ✔ No it is not.
Is a magnetic field inductor only a hazard in high voltage situations? - ✔ ✔ No because the magnetic
field is dependent on current it is also a hazard at lower-distribution voltages.
Is induction an AC charge or a DC charge? - ✔ ✔ AC
Is static Electricity an AC charge or a DC charge? - ✔ ✔ DC
(Side note: Lighting is a form of Static Electricity)
Live line tools, rubber gloves, and insulated booms are all subject to __________________. - ✔ ✔
Some current leakage
Most current takes the path of least resistance but each path will have ______ current flow through it. -
✔ ✔ Some
, On a three-phase wye circuit, how does the current return? - ✔ ✔ Also through the neutral and the
ground.
The branch in a parallel circuit with the _______ resistance gets the most current. - ✔ ✔ least
The current in each path is _________ on the resistance or load in each path. - ✔ ✔ Dependent
The magnitude of the current through each path is __________________ ___________________ to the
resistance. - ✔ ✔ Inversely Proportional
To be considered a qualified electrical worker (work closer than 10 feet) to a distribution circuit you
must be able to recognize what? - ✔ ✔ Recognize these hazards and know the types of barriers to
set in place to control them
True or False: When a vehicle become energized, there are ground gradients in the vicinity of the
vehicles, outriggers, tires, attached trailers, and anything else in contact with the vehicle? - ✔ ✔ True
What are a couple of effective ways to discharge induced voltage effectively? - ✔ ✔ Installing a set of
grounds on the conductors. Also bonds such as between the vehicles, ground probes, and conductors
eliminates exposure to potential differences between them.
What are some hazards to working around sources of Radio Frequency (RF) ? - ✔ ✔ Heating, damage
to organs, burned tissue, raising body temperature
What are some precautions for working with a neutral? - ✔ ✔ 1) properly Identify which conductor
is the neutral.
2) always use a bypass jumper if a neutral is to be cut.
What are the three ways that a person can be electrically affected without contact? - ✔ ✔ Static
Eletricity, Electric Field (capacitive) Induction, Magnetic Field Induction
What are the two types of electrical contact a person can make with an energized circuit? - ✔ ✔
Connected in Series or connected in parallel
What are three typical ground electrodes listed in order or priority? - ✔ ✔ 1) Permanant ground
network such as a station ground, a neutral, or a steel tower.
2) a ground rod or anchor rod in the earth.
3) Temporarily driven ground rod
What are three ways that a vehicle can become an electrical hazard to people on the ground? - ✔ ✔
1) A person on the ground is in contact with a utility vehicle while the uninsulated portion of a boom
accidentally contacts an energized circuit.
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