Transformers

What is the unit of current?

• ohm

• farad

• coulomb

• ampere

What is the primary function of a transformer?

• To convert AC to DC

• To change the voltage level in an AC circuit

• To store electrical energy

• To increase the frequency of the AC supply

What is the unit of measurement for the power rating of a transformer?

What is the term for the voltage applied to the primary winding of a transformer?

• secondary voltage

• primary voltage

• output voltage

• input current

If a transformer steps down the voltage from 220V to 110V with a primary current of 5A, what is the secondary current assuming ideal conditions?

• 2.5A

• 10A

• 5A

• 20A

Which type of transformer is typically used in electronic devices to provide low voltage power?

• Step-up transformer

• Isolation transformer

• Autotransformer

• Step-down transformer

A step-up transformer increases both the voltage and the power of an electrical circuit

• TRUE

• FALSE

A transformer can operate with both AC and DC voltage

• TRUE

• FALSE

Transformers are rated in kVA because the power factor of the load is not considered

• TRUE

• FALSE

How can the efficiency of a transformer be improved?

• By increasing the core losses

• By using a core material with higher magnetic permeability

• By reducing the number of windings

• By increasing the frequency of the input voltage