LADWP Electric Station Operator (Circuit
Breakers, Disconnects, Transformers)
Exam 2027 – Full Q&A Study Guide |
Verified Answers
Disconnects - ANSWER -__________ are provided as a method of visually
confirming that a circuit has been "disconnected" from specified sources of
electrical energy.
Disconnects - ANSWER -__________ are used to energize or de-energize short
sections of conductor such as leads connecting a circuit breaker to its associated
disconnects.
Disconnects - ANSWER -__________ are not designed to interrupts current flow,
open or close circuits, or energize and de-energize circuits other than short
sections.
10 20 - ANSWER -During abnormal conditions, current often exceeds the normal
limitation of these devices by as much as _____ to _____ times their normal rating.
Dielectric medium - ANSWER -This is the insulating mechanism that occupies
the space between the open contacts of a CB and prevents the flow of current
through the device while the contacts are in the open position.
Dielectric - ANSWER -The ability of a substance to prevent the flow of electrical
current is described as its __________ strength.
Conductors - ANSWER -__________ of electricity have no dielectric strength, as
they allow current to flow in a circuit.
, Air - ANSWER -__________, which has a relatively high dielectric strength, is
used as the dielectric medium in many low voltage applications where current
values are also low. A common example is the light switch found in homes, etc.
Circuit Breakers - ANSWER -Some of the materials used in __________that have
sufficient dielectric strength of for interrupting power system current values are:
Insulating oils, pressurized inert gasses, Sulfur Hexafluoride gas, and Vacuum
chambers.
Dirt - ANSWER -___________ and moisture in particular are two elements that
can destroy the interrupting capabilities of a chosen dielectric medium.
explode - ANSWER -Severe contamination of a dielectric medium can cause CBs
to __________ by allowing an arc to be sustained between the open contacts or the
contacts and the grounded tank(s) or housing of the CB.
Bushings - ANSWER -__________ are usually made of insulating porcelain.
Nonconductive - ANSWER -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.
0.2 - ANSWER -The operating time, from fully open to fully closed, in many
large CBs, is often less than __________ seconds.
linkage - ANSWER -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.
Control - ANSWER -__________ circuits use auxiliary devices that direct the
operation of the CB.
Semaphore - ANSWER -The mechanical indicator used at the CB to indicate the
status of the breaker is called the ___________.
Breakers, Disconnects, Transformers)
Exam 2027 – Full Q&A Study Guide |
Verified Answers
Disconnects - ANSWER -__________ are provided as a method of visually
confirming that a circuit has been "disconnected" from specified sources of
electrical energy.
Disconnects - ANSWER -__________ are used to energize or de-energize short
sections of conductor such as leads connecting a circuit breaker to its associated
disconnects.
Disconnects - ANSWER -__________ are not designed to interrupts current flow,
open or close circuits, or energize and de-energize circuits other than short
sections.
10 20 - ANSWER -During abnormal conditions, current often exceeds the normal
limitation of these devices by as much as _____ to _____ times their normal rating.
Dielectric medium - ANSWER -This is the insulating mechanism that occupies
the space between the open contacts of a CB and prevents the flow of current
through the device while the contacts are in the open position.
Dielectric - ANSWER -The ability of a substance to prevent the flow of electrical
current is described as its __________ strength.
Conductors - ANSWER -__________ of electricity have no dielectric strength, as
they allow current to flow in a circuit.
, Air - ANSWER -__________, which has a relatively high dielectric strength, is
used as the dielectric medium in many low voltage applications where current
values are also low. A common example is the light switch found in homes, etc.
Circuit Breakers - ANSWER -Some of the materials used in __________that have
sufficient dielectric strength of for interrupting power system current values are:
Insulating oils, pressurized inert gasses, Sulfur Hexafluoride gas, and Vacuum
chambers.
Dirt - ANSWER -___________ and moisture in particular are two elements that
can destroy the interrupting capabilities of a chosen dielectric medium.
explode - ANSWER -Severe contamination of a dielectric medium can cause CBs
to __________ by allowing an arc to be sustained between the open contacts or the
contacts and the grounded tank(s) or housing of the CB.
Bushings - ANSWER -__________ are usually made of insulating porcelain.
Nonconductive - ANSWER -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.
0.2 - ANSWER -The operating time, from fully open to fully closed, in many
large CBs, is often less than __________ seconds.
linkage - ANSWER -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.
Control - ANSWER -__________ circuits use auxiliary devices that direct the
operation of the CB.
Semaphore - ANSWER -The mechanical indicator used at the CB to indicate the
status of the breaker is called the ___________.
