TRANSFORMERS (LADWP) EXAM 2025 QUESTIONS AND ANSWERS
What is a transformer? - (answer)A device used to increase or decrease the voltage in electrical
circuits.
What are transformers used for? And explain the process. - (answer)They are used to increase or
decrease the voltage in electrical circuits. First lower the current passing through transmission lines by
increasing the voltage and then decreasing the voltage coming to the city, into homes and factories.
What are the components of a transformer? - (answer)Iron Core, Windings, Bushings, Radiators,
Temperature Sensors, Oil gauge.
What is a Step-Up Transformer? - (answer)It increase the voltage and decrease the current. It is used
to reduce the line losses. By increasing the voltage, the line current proportionally decreases and
power loss from cable resistance is reduced.
What is a Step-Down Transformer? - (answer)It decreases the voltage to go into homes and increases
the current.
Where does a Step-Up Transformer have more coil? - (answer)The secondary coil
Where does a Step-Down Transformer have more coil? - (answer)The primary coil
What are some applications of a Step-Down Transformer? - (answer)Adapters, cell phone chargers,
transmission lines, welding machines, TVs, inverters
Advantages of Step-Down Transformer? - (answer)Makes transmission power easier and cheaper,
99% efficiency, low cost, high reliability, high durability, provides varied voltage requirements.
Disadvantages of Step-Down Transformer? - (answer)Requires a lot of maintenance, volatility in
feedstock costs, fault rectification takes more time
What is a transformer? - (answer)A device used to increase or decrease the voltage in electrical
circuits.
What are transformers used for? And explain the process. - (answer)They are used to increase or
decrease the voltage in electrical circuits. First lower the current passing through transmission lines by
increasing the voltage and then decreasing the voltage coming to the city, into homes and factories.
What are the components of a transformer? - (answer)Iron Core, Windings, Bushings, Radiators,
Temperature Sensors, Oil gauge.
What is a Step-Up Transformer? - (answer)It increase the voltage and decrease the current. It is used
to reduce the line losses. By increasing the voltage, the line current proportionally decreases and
power loss from cable resistance is reduced.
What is a Step-Down Transformer? - (answer)It decreases the voltage to go into homes and increases
the current.
Where does a Step-Up Transformer have more coil? - (answer)The secondary coil
Where does a Step-Down Transformer have more coil? - (answer)The primary coil
What are some applications of a Step-Down Transformer? - (answer)Adapters, cell phone chargers,
transmission lines, welding machines, TVs, inverters
Advantages of Step-Down Transformer? - (answer)Makes transmission power easier and cheaper,
99% efficiency, low cost, high reliability, high durability, provides varied voltage requirements.
Disadvantages of Step-Down Transformer? - (answer)Requires a lot of maintenance, volatility in
feedstock costs, fault rectification takes more time
