Transformers Quiz

What type of electricity can transformers work with?

• AC

• None of the above

• Both AC and DC

• DC

What happens to the direction of the current in a closed loop of cable when connected to an AC generator?

• It alternates backwards and forwards

• It increases continuously

• It decreases continuously

• It remains constant

What is the key component that induces a current into the second coil in a transformer?

• Magnetic field

• Frequency

• Resistance

• Voltage

What is the purpose of using an iron core in a transformer?

• To guide the magnetic field to the secondary coil

• To increase the weight of the transformer

• To decrease the efficiency of the transformer

• To reduce the size of the transformer

What is the main reason for using laminated sheets of iron in the core of a transformer?

• To increase the Eddy currents

• To decrease the Eddy currents

• To increase the magnetic field

• To decrease the magnetic field

How is the voltage increased in a step up transformer?

• By decreasing the number of turns in the coil on the secondary side

• By decreasing the number of turns in the coil on the primary side

• By adding more turns to the coil on the secondary side

• By adding more turns to the coil on the primary side

What is the purpose of using a step up transformer in a power station?

• To decrease the voltage for long transmission cables

• To increase the voltage for long transmission cables

• To decrease the current for long transmission cables

• To increase the current for long transmission cables

What is the configuration of the primary and secondary sides in a three phase transformer?

• Delta-Delta

• Wye-Wye

• Wye-Delta

• Delta-Wye

What is the purpose of grounding the centre point of the wye side in a three phase transformer?

• To prevent the flow of electricity

• To decrease the voltage

• To increase the voltage

• To allow for neutral line connection

What is the main reason for using three phase transformers in commercial buildings and power stations?

• To increase the energy losses

• To balance the load and improve efficiency

• To decrease the efficiency of the electrical system

• To increase the complexity of the electrical system