LADWP Electric Station Operator (Circuit
Breakers, Disconnects, Transformers) FINAL
EXAM STUDY GUIDE 2025/2026 ACCURATE
QUESTIONS WITH CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<RECENT VERSION>
1. One of the primary tasks of the Electric Station Operator is the __________
of high voltage circuits. - ANSWER ✓ switching
2. Electrical current may flow across the contacts of ____ to ____ electrical
switches before it reaches the consumer. - ANSWER ✓ 50 100
3. The __________ operation of these electrical switches can pose a serious
hazard to personnel, can cause destruction of expensive power system
equipment, and can cause unnecessary interruption of electrical service to
consumers. - ANSWER ✓ improper
4. Electrical __________ are installed in the path from the generator to the
consumer to provide reliability, flexibility, and safeguards for the electrical
power system. - ANSWER ✓ switches
5. Operators use electrical switches to perform routine, automatic, and
____________ switching operations on the electrical system. - ANSWER ✓
emergency
6. ___________ switching is for maintenance, construction, cleaning, testing,
etc. - ANSWER ✓ Routine
7. ___________ switching operations include automatic reclosers (ARs),
Voltage Pickup Unit (VPUs), and Automatic Transfer Switching (ATSs). -
ANSWER ✓ Automatic
,8. ___________ switching operations include insolate trouble, restoration,
4.8kV Ground Search, etc. - ANSWER ✓ Emergency
9. The placement of ___________ electrical switches in the power system
makes it possible to limit both the duration and the extent of power outages.
- ANSWER ✓ Automatic
10.__________ switching performed by Operators in usually in response to
power outages and abnormal conditions such as overloads. - ANSWER ✓
Emergency
11.The electrical function of switches falls into two categories; ___________ of
relatively high values of current and voltage under load AND the switching
of circuits to provide a visual confirmation of de-energization. - ANSWER
✓ manipulation
12.__________ are electrical switches that are used to manipulate high values
of current and voltage in circuits that are carrying current or will be carrying
current following the operation. - ANSWER ✓ Circuit breakers
13.Transformer oil in good condition must be able to withstand _____kV
applied across two flat electrodes submerged in a staple of the oil without
arcing. - ANSWER ✓ 30
14.__________-ratio is the number of turns of wire in the primary winding
compared to the number of turns in the secondary winding. - ANSWER ✓
Turns
15.An ideal __________ is one in which all the lines of force produced by the
primary winding inductively link every turn of the secondary winding. -
ANSWER ✓ transformer
16.A transformer whose secondary or output voltage is higher that its input or
primary voltage is called a step-________ transformer. - ANSWER ✓ up
17.A transformer whose secondary or output voltage is lower that its input or
primary voltage is called a step-________ transformer. - ANSWER ✓ down
, 18.Larger transformers are about _____% efficient. - ANSWER ✓ 98
19.The amount of __________ delivered by the secondary winding is less than
the amount supplied to the primary winding. - ANSWER ✓ power
20.__________ is stepped down, whenever voltage is stepped up, and vice
versa. - ANSWER ✓ current
21.Large three phase power transformers are generally referred to as
transformer __________ or simply, __________. (same word) - ANSWER
✓ banks
22.__________ allow generators to be connected to the DWP Transmission
System. These banks typically step up the voltage from 18kV, the nominal
voltage of the generator, to transmission voltages of either 138kV or 230kV.
- ANSWER ✓ banks
23._________ banks connect together buses of different voltages such as
138kV to 230kV. - ANSWER ✓ bus
24.__________ banks are dedicated to individual lines. - ANSWER ✓ line
25._________ banks step down 138kV or 230kV Transmission System voltage
to 34.5kV - the Department's Subtransmission System Voltage. - ANSWER
✓ power
26.__________ in distribution stations step down 34.5kV to 4.8kV - the
Department's Distribution System voltage. - ANSWER ✓ banks
27.____________ transformers provide power to small factories, businesses, or
residential areas. - ANSWER ✓ Distribution
28.The __________ voltage of distribution transformers is typically 4.8kV. -
ANSWER ✓ primary
29.The ___________ voltage of distribution transformers is typically 480, 240,
or 120 volts, single or three-phase power, depending on the installation and
customer needs. - ANSWER ✓ secondary
Breakers, Disconnects, Transformers) FINAL
EXAM STUDY GUIDE 2025/2026 ACCURATE
QUESTIONS WITH CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<RECENT VERSION>
1. One of the primary tasks of the Electric Station Operator is the __________
of high voltage circuits. - ANSWER ✓ switching
2. Electrical current may flow across the contacts of ____ to ____ electrical
switches before it reaches the consumer. - ANSWER ✓ 50 100
3. The __________ operation of these electrical switches can pose a serious
hazard to personnel, can cause destruction of expensive power system
equipment, and can cause unnecessary interruption of electrical service to
consumers. - ANSWER ✓ improper
4. Electrical __________ are installed in the path from the generator to the
consumer to provide reliability, flexibility, and safeguards for the electrical
power system. - ANSWER ✓ switches
5. Operators use electrical switches to perform routine, automatic, and
____________ switching operations on the electrical system. - ANSWER ✓
emergency
6. ___________ switching is for maintenance, construction, cleaning, testing,
etc. - ANSWER ✓ Routine
7. ___________ switching operations include automatic reclosers (ARs),
Voltage Pickup Unit (VPUs), and Automatic Transfer Switching (ATSs). -
ANSWER ✓ Automatic
,8. ___________ switching operations include insolate trouble, restoration,
4.8kV Ground Search, etc. - ANSWER ✓ Emergency
9. The placement of ___________ electrical switches in the power system
makes it possible to limit both the duration and the extent of power outages.
- ANSWER ✓ Automatic
10.__________ switching performed by Operators in usually in response to
power outages and abnormal conditions such as overloads. - ANSWER ✓
Emergency
11.The electrical function of switches falls into two categories; ___________ of
relatively high values of current and voltage under load AND the switching
of circuits to provide a visual confirmation of de-energization. - ANSWER
✓ manipulation
12.__________ are electrical switches that are used to manipulate high values
of current and voltage in circuits that are carrying current or will be carrying
current following the operation. - ANSWER ✓ Circuit breakers
13.Transformer oil in good condition must be able to withstand _____kV
applied across two flat electrodes submerged in a staple of the oil without
arcing. - ANSWER ✓ 30
14.__________-ratio is the number of turns of wire in the primary winding
compared to the number of turns in the secondary winding. - ANSWER ✓
Turns
15.An ideal __________ is one in which all the lines of force produced by the
primary winding inductively link every turn of the secondary winding. -
ANSWER ✓ transformer
16.A transformer whose secondary or output voltage is higher that its input or
primary voltage is called a step-________ transformer. - ANSWER ✓ up
17.A transformer whose secondary or output voltage is lower that its input or
primary voltage is called a step-________ transformer. - ANSWER ✓ down
, 18.Larger transformers are about _____% efficient. - ANSWER ✓ 98
19.The amount of __________ delivered by the secondary winding is less than
the amount supplied to the primary winding. - ANSWER ✓ power
20.__________ is stepped down, whenever voltage is stepped up, and vice
versa. - ANSWER ✓ current
21.Large three phase power transformers are generally referred to as
transformer __________ or simply, __________. (same word) - ANSWER
✓ banks
22.__________ allow generators to be connected to the DWP Transmission
System. These banks typically step up the voltage from 18kV, the nominal
voltage of the generator, to transmission voltages of either 138kV or 230kV.
- ANSWER ✓ banks
23._________ banks connect together buses of different voltages such as
138kV to 230kV. - ANSWER ✓ bus
24.__________ banks are dedicated to individual lines. - ANSWER ✓ line
25._________ banks step down 138kV or 230kV Transmission System voltage
to 34.5kV - the Department's Subtransmission System Voltage. - ANSWER
✓ power
26.__________ in distribution stations step down 34.5kV to 4.8kV - the
Department's Distribution System voltage. - ANSWER ✓ banks
27.____________ transformers provide power to small factories, businesses, or
residential areas. - ANSWER ✓ Distribution
28.The __________ voltage of distribution transformers is typically 4.8kV. -
ANSWER ✓ primary
29.The ___________ voltage of distribution transformers is typically 480, 240,
or 120 volts, single or three-phase power, depending on the installation and
customer needs. - ANSWER ✓ secondary
