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Engineering Materials in EE
Engineering Materials in EE
Which of the following gives materials in order of decreasing values of permeability?
Pure iron, silicon iron, aluminium, bismuth.
Permalloy, nickel, air, water.
Cobalt, nickel, aluminium, iron.
Silver, copper, aluminium, iron.
Pure iron, silicon iron, aluminium, bismuth.
Permalloy, nickel, air, water.
Cobalt, nickel, aluminium, iron.
Silver, copper, aluminium, iron.
Answer
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Engineering Materials in EE
In electrical machines the material preferred for pole shoes of electromagnets is
copper.
aluminium.
pure iron.
lead.
copper.
aluminium.
pure iron.
lead.
Answer
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Engineering Materials in EE
It is difficult to magnetize steel because it has
low susceptibility.
low permeability.
high permeability.
high permittivity.
low susceptibility.
low permeability.
high permeability.
high permittivity.
Answer
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Engineering Materials in EE
Dielectric constant for vacuum is
0.
100.
infinity.
1.
0.
100.
infinity.
1.
Answer
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Engineering Materials in EE
In order to minimise loss due to hysteresis, the magnetic material should have
large B-H loop area.
low hysteresis coefficient.
high retentivity.
high resistivity.
large B-H loop area.
low hysteresis coefficient.
high retentivity.
high resistivity.
Answer
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