ISA Utility Specialist (Ch. 5: Electrical
Knowledge) Exam Questions and
Answers
What is a volt? - Correct Answers -a unit of electrical force
Electrical resistance determines how much __________ is required to move electricity
along a conductor and is measured in __________. - Correct Answers -energy;
ohms
A conductor carrying more than __________ volts would be considered a NERC line. -
Correct Answers -200,000
2 examples of protective equipment: - Correct Answers -circuit breakers
lightning receptors
An energized wire or conductor in a circuit is also known as a __________. - Correct
Answers -phase
True or False?
Guy wires are intended to help support poles but may become unintentionally
energized. - Correct Answers -true
A __________ is similar to a fuse or cutout, but it resets after a predetermined time
period. - Correct Answers -re-closer
Minimum working distances for qualified line-clearance arborists are specified in the
__________ safety standard. - Correct Answers -ANSI Z133
When installing underground conductors, __________ should be used in tree root
protection zones. - Correct Answers -tunneling
Distribution transformers typically __________ primary circuit voltage for the end user. -
Correct Answers -reduce
Amp: - Correct Answers -the measure of electrical current
Service lines and secondary distribution lines usually carry voltage between
__________-__________ volts. - Correct Answers -120-240
, Transmission lines terminate at __________. - Correct Answers -substations
Voltage use by North American utilities ranges from _____ V-_____ kV. - Correct
Answers -120 V-765 kV
__________ __________, the principal protective devices in distribution substations,
are designed to operate in as little as 10 Hz. - Correct Answers -circuit breakers
Electrical flow in an unintended direction: - Correct Answers -backfeed
A __________ is a blocked current or a bypass of an intended conducting path. -
Correct Answers -fault
When a tree contacts one electrical conductor, it may cause a __________-to-
__________ fault. - Correct Answers -phase-ground fault
The minimum approach distance for non-qualified line clearance personnel from
energized conductors 50 kV and less: - Correct Answers -10 feet
The condition that allows electricity to flow from one object to another is called: - Correct
Answers -potential
What is a Watt? - Correct Answers -a measure of electrical power
A phase-to-phase fault occurs when there is contact between: - Correct Answers -two or
more energized conductors
If the coating on a weatherproofed conductor falls off, the conductor will often
__________. - Correct Answers -deteriorate
Ohm's Law describes the relationship between: - Correct Answers -voltage, current, &
resistance
Formula for Ohm's Law: - Correct Answers -Volts = Amps x Resistance
(V = I x R)
Formula for power: - Correct Answers -Power = Volts x Current
(P = V x I)
A __________ is another name for a generating plant, and is the source of most power
in the U.S. The most common sources for this power are __________ __________,
__________ or __________ turbines, & __________ __________. - Correct Answers -
powerhouse;
fossil fuels, wind or water turbines, & nuclear reactors
Knowledge) Exam Questions and
Answers
What is a volt? - Correct Answers -a unit of electrical force
Electrical resistance determines how much __________ is required to move electricity
along a conductor and is measured in __________. - Correct Answers -energy;
ohms
A conductor carrying more than __________ volts would be considered a NERC line. -
Correct Answers -200,000
2 examples of protective equipment: - Correct Answers -circuit breakers
lightning receptors
An energized wire or conductor in a circuit is also known as a __________. - Correct
Answers -phase
True or False?
Guy wires are intended to help support poles but may become unintentionally
energized. - Correct Answers -true
A __________ is similar to a fuse or cutout, but it resets after a predetermined time
period. - Correct Answers -re-closer
Minimum working distances for qualified line-clearance arborists are specified in the
__________ safety standard. - Correct Answers -ANSI Z133
When installing underground conductors, __________ should be used in tree root
protection zones. - Correct Answers -tunneling
Distribution transformers typically __________ primary circuit voltage for the end user. -
Correct Answers -reduce
Amp: - Correct Answers -the measure of electrical current
Service lines and secondary distribution lines usually carry voltage between
__________-__________ volts. - Correct Answers -120-240
, Transmission lines terminate at __________. - Correct Answers -substations
Voltage use by North American utilities ranges from _____ V-_____ kV. - Correct
Answers -120 V-765 kV
__________ __________, the principal protective devices in distribution substations,
are designed to operate in as little as 10 Hz. - Correct Answers -circuit breakers
Electrical flow in an unintended direction: - Correct Answers -backfeed
A __________ is a blocked current or a bypass of an intended conducting path. -
Correct Answers -fault
When a tree contacts one electrical conductor, it may cause a __________-to-
__________ fault. - Correct Answers -phase-ground fault
The minimum approach distance for non-qualified line clearance personnel from
energized conductors 50 kV and less: - Correct Answers -10 feet
The condition that allows electricity to flow from one object to another is called: - Correct
Answers -potential
What is a Watt? - Correct Answers -a measure of electrical power
A phase-to-phase fault occurs when there is contact between: - Correct Answers -two or
more energized conductors
If the coating on a weatherproofed conductor falls off, the conductor will often
__________. - Correct Answers -deteriorate
Ohm's Law describes the relationship between: - Correct Answers -voltage, current, &
resistance
Formula for Ohm's Law: - Correct Answers -Volts = Amps x Resistance
(V = I x R)
Formula for power: - Correct Answers -Power = Volts x Current
(P = V x I)
A __________ is another name for a generating plant, and is the source of most power
in the U.S. The most common sources for this power are __________ __________,
__________ or __________ turbines, & __________ __________. - Correct Answers -
powerhouse;
fossil fuels, wind or water turbines, & nuclear reactors
