ENGINEERING MATERIALS IN EE QUIZ

Which of following material has least value of dielectric constant?

Ceramics.

Oil.

Paper.

Glass.

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

magneto-calorisation.

magnetic expansion.

magnetostriction.

magnetic hysteresis.

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ALNICO is an alloy of

aluminium, nickel, iron and cobalt.

iron, aluminium.

iron, cobalt, nickel.

aluminium, nickel.

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Permittivity of free space is equal to

8.854 × 10 - 10 F / m.

8.854 × 10 - 13 F / m.

8.854 × 10 - 12 F / m.

8.854 × 10 - 11 F / m.

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________ is the most detrimental impurity in the magnetic materials

Sulphur.

Oxygen.

Carbon.

Nitrogen.

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Which of the following statements is not part of Daltons atomic theory?

An atom contains a dense central nucleus.

Atoms can combine to form compounds.

Atoms of different elements are quite different.

All matter is composed of atoms.

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Why diamond is very hard ?

Because of high melting point

None of these

Because of large cohesive energy

Because of covalent solid

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Which of the following is the ferroelectric material ?

Barium titanate.

Rochelle salt.

All of these

Potassium dihydrogen phosphate.

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Indicate which of following material does not retain magnetism permanently

stainless steel.

none of above.

hardness steel.

soft iron.

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Cryogenics is a branch of science dealing with which of the following?

Low temperature.

Crystal growth.

Friction and wear.

High temperature.

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