Transformer Study Guide

The transformer is a device used to .......... the value of a voltage.

• steady

• resist

• change

• anchor

If a transformer reduces voltage, it is called a....................... transformer.

• step left

• step right

• step up

• step down

Why transformers work with A.C. current but not D.C.

• A.C current produces changing magnetic field.

• D.C current produces changing magnetic field.

• D.C current is weak

• A.C current is powerful

Which of the following does not change in a transformer?

• Voltage

• Current

• Power

• Frequency

This picture is an example of a ________________.

• Motor

• Generator

• Step-up transformer

• Step-down transformer

Ratio of voltages is equal to ratio of _______________________.

• number of iron sheets in core

• number of coil

• number of turns in coil

• number of electromagnetic

A transformer has 100 turns in the primary coil and 25 turns in the secondary coil. When a 120 V is applied to the primary coil, what is the voltage in the secondary coil?

• 480V

• 30V

• 20V

• 450V

The function of a transformer is to ...

• raise and lower the apparent power levels

• transfer DC voltage from the primary winding to the secondary winding

• increase or decrease A.C voltage or A.C current (Amps) levels

• transform mechanical energy into electrical energy

What is the meaning of transformer?

• Optimus Prime

• A device that transfers electrical energy from one circuit to another

• Autobots

• Megatron

What is the material used for construction of transformer core?

• Aluminium

• Copper

• Iron

• Wood