ENGINEERING MATERIALS IN EE QUIZ

According to the Bohr model, an electron gains or losses energy only by

jumping from one allowed orbit to another.

jumping from one atom to another atom.

being completely removed from an atom.

moving faster or slower in an allowed orbit.

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When will be the electron pair bonding occurs ?

None of these

Lack holes

Share holes

Share electrons

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How many classes of insulating materials are there?

7.

8.

6.

5.

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The permanent magnets are made from which of following materials ?

Paramagnetic.

Soft iron.

Diamagnetic.

Ferromagnetic.

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Permittivity of free space is equal to

8.854 × 10 - 12 F / m.

8.854 × 10 - 11 F / m.

8.854 × 10 - 13 F / m.

8.854 × 10 - 10 F / m.

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Why diamond is very hard ?

Because of covalent solid

Because of high melting point

None of these

Because of large cohesive energy

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The permeability of iron can be increased by

reducing carbon percentage.

increasing carbon percentage.

alloying with cobalt.

purifying it.

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A material with unequal anti-parallel atomic magnetic moments is

an anti-ferromagnet.

non-magnetic.

a ferrite.

ferrimagnet.

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In order to minimise loss due to hysteresis, the magnetic material should have

low hysteresis coefficient.

high retentivity.

high resistivity.

large B-H loop area.

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All ions of an element have the same

both option A. and C.

number of protons.

number of electrons.

atomic number.

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