EMS .

The ratio of intensity of magnetisation to magnetising force is called:

• Susceptibility

•  Permeability

• magnetic potential

• None of the above

Which from below is that property which opposes the production of magnetic flux in it:

• Magnetic reluctance

• Remanance

• Retentivity

• Susceptibility

The magnetic force demand is :

• Higher for hard ferro magnets

•  Higher for hard ferrites

• Remains the same for two

• None of the above

Small magnets are made by:

• Special casting techniques

• powder metallurgical technique

• heat treatment

• none of the above

Ferrites are:

• Ferromagnetic material

• Ferrimagnetic material

• Anti ferromagnetic material

• None of the above

Which of the followeing materiasls have maximum magnetic permeability:

• Pure iron

• 4% silicon steel

• Grain oriented silicon-iron

• None of the above

Curie point temperature:

• remains constant for all materials

• differs from material to material

• both of the above

•  None of the above

For ferromagnetic materials, the susceptibility:

•  is constant

• is not constant

• is zero

• none of the above

Curie temperature is the temperature above which a ferro-magnetic material becomes:

• Paramagnetic

• dimagnetic

• either of the above

• none of the above

The Relative permeability of mild steel (iron) iron is around:

• 500

• 800

• 1200

• 2000