TRANSFORMERS

An static device that transfers AC electrical energy from one circuit to another without change in frequency.

• Inverter

• Oscillator

• Transducer

• Transformer

The working principle of a transformer is __________.

• Self-induction

• Static induction

• Mutual induction

• Dynamic induction

The primary and secondary windings of a transformer are __________ coupled.

• Physically

• Electrically

• Magnetically

• Electromagnetically

Transformer is used to change the values of __________.

• Power

• Voltage

• Frequency

• Power factor

Transformer core are laminated in order to reduce __________.

• a. Copper loss

• b. Hysteresis loss

• c. Eddy current loss

• d. Both A and B

Transformer cores are made up of __________.

• Manganese steel

• Silicon steel

• Carbon steel

• Cobalt

The steel for construction of transformer core must have __________.

• High permeability and high hysteresis

• Low permeability and low hysteresis

• High permeability and low hysteresis

• Low permeability and high hysteresis

The main function of the iron core in a transformer is to __________.

• Reduce eddy current loss

• Decrease the hysteresis loss

• Provide strength to the windings

• Decrease reluctance of the magnetic path

The maximum flux produced in the core of a transformers is __________.

• Inversely proportional to the supply frequency

• Directly proportional to the supply frequency

• Inversely proportional to the primary voltage

• Directly proportional to the primary number of turns

Ideal transformer assumptions do not include __________.

• No leakage flux

• No saturation of core

• Zero reactance of windings

• Zero resistance of windings