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A transformer is a passive electrical device that transfers _________________ between 2 or more circuits.

• electrical energy

• current

• voltage

• electromagnetic energy

Electrical energy is transferred through ______________ in a transformer.

• electric field

• rotor

• magnetic field

• air space

Primary winding of a transformer is determined by _________.

• which winding has more turns

• which winding is nearer to the load

• which winding is connected to the source

• which side has the highest voltage

The diagram above refers to

• Construction of transformer

• Polarity of transformer

• Schematic of transformer

• Symbol of transformer

What type of transformer is used to increase the voltage from power stations.

• Step-down transformer

• Step-up transformer

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

What is the material used for construction of transformer core?

• Aluminium

• Copper

• Silicon steel

• Wood

Instrument transformers are used to ________________.

• transform mechanical energy into electrical energy.

• isolate or transform voltage or current levels.

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

• transfer DC current from the primary winding to the secondary winding.

Which of the following is an instrument transformers?

• Potential transformers

• Current transformers

• All of the above

• None of the above