LADWP ELECTRIC STATION
OPERATOR (CIRCUIT BREAKERS,
DISCONNECTS, TRANSFORMERS)
EXAM 2025 QUESTIONS AND CORRECT
ANSWERS | A+ GRADE
__________ are usually made of insulating porcelain.
Correct Answer Bushings
Portions of the mechanical linkages connected to movable
contacts must be constructed of __________ materials to
prevent the electrical components of the contacts and
conductors from energizing the components of the CB
such as the tank, controls, etc. Correct Answer
Nonconductive
The operating time, from fully open to fully closed, in many
large CBs, is often less than __________ seconds.
Correct Answer 0
Failure of the mechanical __________ (sometimes
referred to as the actuating arm or lever) can cause
serious damage to the circuit breaker or may cause
normally non-energized portions of the CB to become
energized. Correct Answer linkage
__________ circuits use auxiliary devices that direct the
operation of the CB. Correct Answer Control
, The mechanical indicator used at the CB to indicate the
status of the breaker is called the ___________. Correct
Answer Semaphore
__________ must never be used to interrupt current flow
in circuit. Correct Answer Disconnects
__________ are usually operated manually by the use of
levers, cranks, and "hook-sticks poles." Correct Answer
Disconnects
The size of an electric arc and destruction it can cause are
directly proportional to the amount of ___________ being
interrupted. Correct Answer current
The current that continues to flow across the opening
contacts of a switch (or across any opening in a circuit) is
known as an __________. Correct Answer Arc
Dry, clean air normally has a __________ strength of
about 10,000 volts per inch. This means that you would
have to apply a voltage greater than 10,000 volts across
conductors separated by one inch of air to establish
current flow across the separated conductors. Correct
Answer dielectric
Air has a high __________ value so this current flow
creates heat. Correct Answer resistance
OPERATOR (CIRCUIT BREAKERS,
DISCONNECTS, TRANSFORMERS)
EXAM 2025 QUESTIONS AND CORRECT
ANSWERS | A+ GRADE
__________ are usually made of insulating porcelain.
Correct Answer Bushings
Portions of the mechanical linkages connected to movable
contacts must be constructed of __________ materials to
prevent the electrical components of the contacts and
conductors from energizing the components of the CB
such as the tank, controls, etc. Correct Answer
Nonconductive
The operating time, from fully open to fully closed, in many
large CBs, is often less than __________ seconds.
Correct Answer 0
Failure of the mechanical __________ (sometimes
referred to as the actuating arm or lever) can cause
serious damage to the circuit breaker or may cause
normally non-energized portions of the CB to become
energized. Correct Answer linkage
__________ circuits use auxiliary devices that direct the
operation of the CB. Correct Answer Control
, The mechanical indicator used at the CB to indicate the
status of the breaker is called the ___________. Correct
Answer Semaphore
__________ must never be used to interrupt current flow
in circuit. Correct Answer Disconnects
__________ are usually operated manually by the use of
levers, cranks, and "hook-sticks poles." Correct Answer
Disconnects
The size of an electric arc and destruction it can cause are
directly proportional to the amount of ___________ being
interrupted. Correct Answer current
The current that continues to flow across the opening
contacts of a switch (or across any opening in a circuit) is
known as an __________. Correct Answer Arc
Dry, clean air normally has a __________ strength of
about 10,000 volts per inch. This means that you would
have to apply a voltage greater than 10,000 volts across
conductors separated by one inch of air to establish
current flow across the separated conductors. Correct
Answer dielectric
Air has a high __________ value so this current flow
creates heat. Correct Answer resistance
