ENGINEERING MATERIALS IN EE QUIZ

Susceptibility is negative for

ferromagnetic substances.

none of above.

non magnetic substances.

diamagnetic substances.

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

being completely removed from an atom.

jumping from one allowed orbit to another.

moving faster or slower in an allowed orbit.

jumping from one atom to another atom.

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Positive magnetostriction exists when

none of above.

both are correct.

dipoles are repel other.

dipoles are attract each other.

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Permanent magnets are used in

generators.

motors.

loud speakers.

all of above.

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Which of following material has least value of dielectric constant?

Paper.

Ceramics.

Oil.

Glass.

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In Bohr’s model of atomic structure, the nucleus consists of

protons and neutrons.

electrons.

electrons and protons.

protons.

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Dielectric constant for vacuum is

0.

100.

infinity.

1.

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A ferromagnetic core subjected to cycles of magnetisation will exhibit hysteresis when the cycle is

rotating.

alternating.

pulsating.

/ >(A), (B), and (C) are all correct.

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Materials having a high dielectric constant, which is non-linear, are known as

hard die-electrics.

ferroelectric materials.

elastomers.

super die-electrics.

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The number of rings in the Bohr model of any element is determined by what?

Atomic mass.

Column number on periodic table.

Atomic number.

Row number on periodic table.

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