electrical ii quiz

Transformer cores are laminated inorder to

• Minimize eddy current loss

• Reduce cost

• Reduce hysteresis loss

• Simplify its construction

The primary and secondary induced e.m.fs E1 and E2 in a two winding transformer are always

• Equal in magnitude

• Antiphase with each other

• In phase with each other

• Determined by load on transformer secondary

A freely suspended magnet always comes to rest in

• North south direction
• North east direction
• Both a and b
• None

The group of force lines going from north pole to the south pole of a magnet is called

• Magnetic Flux
• Magneto motive force
• Both a and b
• None

The force that produce magnetic field is

• Flux
• Magnetic flux
• MMF
• None

The unit of mmf is

• Weber
• Ampere-turn
• Henry
• None

Opposition to the flow of magnetic fied is

• Reluctance
• Flux
• Electric field
• Resistance

The unit of reluctance is

• Flux
• Weber
• Ampere
• Ampere-turn/ weber

The magnetic field has

• Positive and negative
• Phase and neutral
• North and south pole
• None

The force rule states the light charges repel unlike charges

• Oppose
• Attract
• Both a and b
• None