NC3 AC Transformers ARTICLE

What is the primary function of a transformer?

• To transfer power from the primary winding to the secondary winding through electromagnetic induction

• To generate electricity

• To store electrical energy

• To convert AC to DC

Which of the following is a characteristic of a step-up transformer?

• The number of turns in the primary winding is lower than in the secondary winding

• The number of turns in the primary winding is higher than in the secondary winding

• The primary and secondary windings have the same number of turns

• The transformer has a turns ratio of 1:1

What is the turns ratio of a transformer with twice as many turns in the primary winding as in the secondary winding?

• 2:1

• 1:2

• 1:1

• 3:1

Which type of transformer is primarily used for electrical insulation?

• Isolation transformer

• Power transformer

• Control transformer

• Step-up transformer

What is the voltage regulation of a transformer?

• Its ability to maintain the secondary voltage constant as the secondary current increases

• Its ability to increase voltage

• Its ability to decrease current

• Its ability to convert AC to DC