Quiz on Magnetic Circuit & Transformer

What is the primary function of a transformer?

• To convert AC to DC

• To transform electric power from one circuit to another

• To store electrical energy

• To increase resistance in a circuit

Which of the following materials is NOT commonly used for transformer cores?

• Ferrite

• Copper

• Laminated silicon steel

• Soft Iron

What principle does a transformer operate on when inducing voltage?

• Kirchhoff's Voltage Law

• Newton's Law of Motion

• Faraday's Law of Induction

• Ohm's Law

In a core-type transformer, how is the iron circuit arranged?

• Surrounded by windings

• In a circular shape

• In a triangular shape

• In a straight line

What is the efficiency assumption for an ideal transformer?

• 90%

• 100%

• 75%

• 50%

Which type of transformer has a single winding that acts as both primary and secondary?

• Autotransformer

• Polyphase transformer

• Shell-type transformer

• Core-type transformer

What is the effect of leakage flux in a transformer?

• Increases efficiency

• Causes energy loss

• Improves voltage regulation

• Reduces current

What is the primary cause of core loss in transformers?

• Proximity effect

• Skin effect

• Eddy currents

• Mechanical vibrations

According to Lenz’s Law, what does the resulting current in the secondary do?

• Dissipates energy

• Increases the primary voltage

• Opposes the original flux

• Enhances the original flux

If a transformer has a primary voltage of 4000V and a secondary voltage of 200V, what is the turns ratio?

• 20:1

• 10:1

• 2:1

• 5:1