EMS2

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