LADWP Electric Station Operator (Circuit
Breakers, Disconnects, Transformers)
Question 1
Operators, among others, are charged with the responsibility of providing good
__________ service. This means no unplanned service interruptions to customer load.
Correct Answer
customer
Question 2
__________, 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.
Correct Answer
Air
Question 3
Larger transformers are about _____% efficient.
Correct Answer
98
Question 4
____________ transformers provide power to small factories, businesses, or residential
areas.
Correct Answer
Distribution
Page 1 of 21
,Question 5
A switching plan must include the name of the __________ being operated and the
major steps required to perform the switching.
Correct Answer
circuit
Question 6
The heat caused by iron and copper losses shortens the service life of __________
materials used in transformer windings. This may cause premature transformer failure.
Correct Answer
insulating
Question 7
__________ circuits use auxiliary devices that direct the operation of the CB.
Correct Answer
Control
Question 8
Using multiple contacts and rapid opening times helps __________ the arc by reducing
the cross sectional area of the arc or by lengthening it.
Correct Answer
cool
Question 9
When the fault current path is across the surface of a bushing or insulator, for
example, the heat produced is great enough to cause rapid and forceful
fragmentation the porcelain. The effect is essentially a porcelain __________.
Correct Answer
grenade
Page 2 of 21
, Question 10
A ___________-shaped coil allows a much stronger field to be created than a flat coil
does.
Correct Answer
spiral
Question 11
__________ allow the transfer of electric energy between two circuits that are
completely insulated from each other through the use of magnetic induction.
Correct Answer
Transformers
Question 12
When current flow in a coil causes an emf to be induced in itself, it is known as
__________.
Correct Answer
self induction
Question 13
Bank-in-Service caps are __________ devices that are applied to the control handles of
closed bank CBs.
Correct Answer
blocking
Question 14
A transformer whose secondary or output voltage is lower that its input or primary
voltage is called a step-________ transformer.
Correct Answer
down
Page 3 of 21
Breakers, Disconnects, Transformers)
Question 1
Operators, among others, are charged with the responsibility of providing good
__________ service. This means no unplanned service interruptions to customer load.
Correct Answer
customer
Question 2
__________, 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.
Correct Answer
Air
Question 3
Larger transformers are about _____% efficient.
Correct Answer
98
Question 4
____________ transformers provide power to small factories, businesses, or residential
areas.
Correct Answer
Distribution
Page 1 of 21
,Question 5
A switching plan must include the name of the __________ being operated and the
major steps required to perform the switching.
Correct Answer
circuit
Question 6
The heat caused by iron and copper losses shortens the service life of __________
materials used in transformer windings. This may cause premature transformer failure.
Correct Answer
insulating
Question 7
__________ circuits use auxiliary devices that direct the operation of the CB.
Correct Answer
Control
Question 8
Using multiple contacts and rapid opening times helps __________ the arc by reducing
the cross sectional area of the arc or by lengthening it.
Correct Answer
cool
Question 9
When the fault current path is across the surface of a bushing or insulator, for
example, the heat produced is great enough to cause rapid and forceful
fragmentation the porcelain. The effect is essentially a porcelain __________.
Correct Answer
grenade
Page 2 of 21
, Question 10
A ___________-shaped coil allows a much stronger field to be created than a flat coil
does.
Correct Answer
spiral
Question 11
__________ allow the transfer of electric energy between two circuits that are
completely insulated from each other through the use of magnetic induction.
Correct Answer
Transformers
Question 12
When current flow in a coil causes an emf to be induced in itself, it is known as
__________.
Correct Answer
self induction
Question 13
Bank-in-Service caps are __________ devices that are applied to the control handles of
closed bank CBs.
Correct Answer
blocking
Question 14
A transformer whose secondary or output voltage is lower that its input or primary
voltage is called a step-________ transformer.
Correct Answer
down
Page 3 of 21
