Transformer Quiz

What is the primary function of a transformer?

• Convert AC to DC

• Change voltage levels

• Store electrical energy

• Measure current

Which principle does a transformer operate on?

• Capacitive coupling

• Electromagnetic induction

• Resistive heating

• Piezoelectric effect

In a step-up transformer, which is true?

• Secondary voltage is lower than primary voltage

• Secondary voltage is equal to primary voltage

• Secondary voltage is higher than primary voltage

• There is no change in voltage

What do the turns ratio Np/Ns indicate?

• Resistance of the transformer

• Voltage transformation ratio

• Current transformation ratio

• Power loss in the transformer

Which type of transformer is used for voltage isolation?

• Step-up Transformer

• Step-down Transformer

• Autotransformer

• Isolation Transformer

What type of losses occur in the copper windings of a transformer?

• Core losses

• Eddy current losses

• Copper losses

• Hysteresis losses

What does a current transformer (CT) measure?

• Voltage levels

• Current levels

• Frequency

• Power factor

Which type of transformer shares a portion of the winding between primary and secondary?

• Step-up Transformer

• Step-down Transformer

• Autotransformer

• Current Transformer

What material is commonly used for the core of a transformer?

• Aluminum

• Copper

• Silicon steel

• Plastic

What is the efficiency range of modern transformers?

• 50% to 70%

• 70% to 85%

• 85% to 95%

• 95% to 99%