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Engineering Materials in EE

Engineering Materials in EE
Magnetic recording tape is most commonly made from

 ferric-oxide.
 iron-dust.
 small particles of iron.
 silicon-iron.

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Engineering Materials in EE
Materials which lack permanent magnetic dipoles are called

 semi-magnetic.
 ferro-magnectic.
 dia-magnetic.
None of these

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Engineering Materials in EE
When a ferromagnetic substance is magnetized small changes in dimensions occur. Such a phenomenon is known as

 magnetostriction.
 magnetic hysteresis.
 magneto-calorisation.
 magnetic expansion.

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Engineering Materials in EE
What is the dielectric constant of mica ?

 1 to 2.
 200.
  3 to 8.
 100.

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Engineering Materials in EE
How many classes of insulating materials are there?

 7.
 8.
 6.
 5.

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Engineering Materials in EE
Temporary magnets are used in which of the following ?

  Hoist.
  All of these.
  Generators.
  Motors.

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MORE MCQ ON Engineering Materials in EE

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