Exercise: Materials And Components

Questions for: Materials And Components

If e is the charge of an electron, R is the radius of its orbit and ω is the angular velocity of electron, the magnetic dipole moment μm of the orbit is |μm| = eωR2.
A:
True
B:
False
C:
D:
Answer: B

1 μm 1 = 0.5 eωr2.

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Assertion (A): Ferroelectric materials have spontaneous polarization.

Reason (R): Above curie temperature, ∈ = for ferro-electric materials.

A:
Both A and R are true and R is correct explanation of A
B:
Both A and R are true but R is not correct explanation of A
C:
A is true but R is false
D:
A is false but R is true
Answer: B

Both A and R are correct. Spontaneous polarization vanishes above ferroelectric curie temperature.

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Hydrogen is used in
A:
large size transformers
B:
MCB
C:
large size generators
D:
circuit breakers
Answer: C

Modem large size generators have hydrogen cooling.

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For a paramagnetic material, susceptiblity increases with increasing temperature.
A:
True
B:
False
C:
D:
Answer: B

Susceptibility ∝ .

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In metals the valence electron wave functions are strongly perturbed by the presence of neighbouring atoms.
A:
True
B:
False
C:
D:
Answer: A

In a metal valence electrons are shared by all atoms.

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