MAGNETISM

What is the unit of permeance?

• Ampere - turns

• Weber / Ampere turns

• Ampere turns / Weber

• Weber / Square metre

What is the unit of reluctance?

• Weber / metre square

• Weber / metre

• Ampere turns / weber

• Ampere turns / metre square

Which defines the flux density is always lagging behind the magnetising force?

• Hysteresis

• Magnetic intensity

• Magnetic induction

• Residual magnetism

What is the S.I unit of flux density?

• Tesla

• Weber

• Weber / Metre

• Ampere-turns

What is the unit of Magneto Motive Force (MMF) ?

• Ampere / M square

• Ampere - metre

• Ampere - turns

• Ampere / turns

Which is the diamagnetic substance?

• Air

• Steel

• Water

• Platinum

Which material is the paramagnetic substance?

• cleat (porcelain)

• copper

• Bismuth

• Graphite

What is effect on surrounding metal placed in a magnetic field ?

• Hysteresis

• Skin effect

• Eddy current

• Dielectric stress

Which electrical quantity is directly proportional to the eddy current ?

• Voltage

• Current

• Frequency

• Resistance

What is the effect of inductance if the distance between the turns increases ?

• Inductance method

• Single touch method

• Double touch method

• Divided touch method