LADWP ELECTRIC STATION OPERATOR
EXAM WITH CORRECT ACTUAL
QUESTIONS AND CORRECTLY WELL
DEFINED ANSWERS LATEST ALREADY
GRADED A+
Disconnects - ANSWERS-__________ are not designed to
interrupts current flow, open or close circuits, or energize
and de-energize circuits other than short sections.
10 20 - ANSWERS-During abnormal conditions, current often
exceeds the normal limitation of these devices by as much
as _____ to _____ times their normal rating.
Dielectric medium - ANSWERS-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 - ANSWERS-The ability of a substance to prevent
the flow of electrical current is described as its __________
strength.
Conductors - ANSWERS-__________ of electricity have no
dielectric strength, as they allow current to flow in a circuit.
Air - ANSWERS-__________, 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 - ANSWERS-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 - ANSWERS-___________ and moisture in particular are
two elements that can destroy the interrupting capabilities
of a chosen dielectric medium.
explode - ANSWERS-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 - ANSWERS-__________ are usually made of
insulating porcelain.
Nonconductive - ANSWERS-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 - ANSWERS-The operating time, from fully open to fully
closed, in many large CBs, is often less than __________
seconds.
linkage - ANSWERS-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.
EXAM WITH CORRECT ACTUAL
QUESTIONS AND CORRECTLY WELL
DEFINED ANSWERS LATEST ALREADY
GRADED A+
Disconnects - ANSWERS-__________ are not designed to
interrupts current flow, open or close circuits, or energize
and de-energize circuits other than short sections.
10 20 - ANSWERS-During abnormal conditions, current often
exceeds the normal limitation of these devices by as much
as _____ to _____ times their normal rating.
Dielectric medium - ANSWERS-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 - ANSWERS-The ability of a substance to prevent
the flow of electrical current is described as its __________
strength.
Conductors - ANSWERS-__________ of electricity have no
dielectric strength, as they allow current to flow in a circuit.
Air - ANSWERS-__________, 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 - ANSWERS-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 - ANSWERS-___________ and moisture in particular are
two elements that can destroy the interrupting capabilities
of a chosen dielectric medium.
explode - ANSWERS-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 - ANSWERS-__________ are usually made of
insulating porcelain.
Nonconductive - ANSWERS-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 - ANSWERS-The operating time, from fully open to fully
closed, in many large CBs, is often less than __________
seconds.
linkage - ANSWERS-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.
