AC Machine (Transformers)

Material used for construction of transformer core is usually

• wood

• copper

• aluminum

• silicon steel

One of the following is not a basic part of oil-type power transformer

• Radiator

• primary windings

• oil drum

• load tap transformer

What is the purpose of welded tubes at the sides of a transformer

• support

• grounding

• termination

• cooling

A common method of cooling a power transformer is

• natural air cooling

• air blast cooling

• oil cooling

• any of the above

The power transformer is a constant

• voltage device

• current device

• power device

• main flux device

Which of the following does not change in a transformer

• current

• frequency

• voltage

• all of the above

A transformer is used to change the value of

• power factor

• power

• frequency

• voltage

Which of the following is not a part of transformer installation

• conservator

• Buchholz relay

• breather

• exciter

Which winding is a transformer has more number of turns

• low voltage winding

• high voltage winding

• primary winding

• secondary winding

The transformer rating are usually expresses in terms of

• volts

• kW

• kVA

• amperes