unit 3 electrical 2

A transformer transfer

• frequency
• voltage
• current
• all of the above

Which of the following is not a basic element of a transformer?

• core
• primary winding
• secondary winding
• mutual flux

In an ideal transformer

• windings have no resistance
• core has no losses
• core has infinite permeability
• all of the above

The main purpose of using core in a transformer is to

• decrease iron losses
• prevent eddy current loss
• eliminate magnetic hysteresis
• decrease reluctance of the common magnetic circuit

Transformer cores are laminated inorder to

• power
• current
• voltage
• none of these

The two windings of an ordinary transformer is

• conductively linked
• inductively linked
• Not linked at all
• electrically linked

Transformer action requires a

• constant magnetic flux
• increasing magnetic flux
• alternating magnetic flux
• alternating electric flux

The flux created by the current flowing through the primary winding induces emf in

• primary winding only
• secondary winding only
• transformer core only
• both primary and secondary windings

The iron core in a transformer provides a _____ path to the main flux

• low reluctance
• high reluctance
• low resistance
• all of the above

. For an ideal transformer the windings should have

• maximum resistance on primary side and least resistance on secondary side
• least resistance on primary side and maximum resistance on secondary side
• Equal resistance on primary and secondary sides
• no ohmic resistance on either side