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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 6
31.
When temperature is above ferromagnetic Curie temperature, a ferromagnetic material
becomes a paramagnetic material
becomes a very strong ferromagnetic material
becomes diamagnetic material
none of the above
Answer: Option
Explanation:

Above ferromagnetic Curie temperature, ferro-magnetic material behaves as a paramagnetic material.

32.
A magnet does not attract
nickel
iron
copper
iron and copper
Answer: Option
Explanation:

Only copper is non-magnetic.

33.
Bitter powder patterns prove the existence of domains.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.

Assertion (A): An amorphous material is obtained when mobility of atoms is inhibited during solidification.

Reason (R): Crystalline state is a natural state for most solids.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
An air cored inductance is a
linear circuit element because its reactance varies linearly with voltage at a fixed frequency
linear circuit element because its current varies linearly with voltage at a fixed frequency
nonlinear circuit element due to saturation of core
nonlinear circuit element because v =
Answer: Option
Explanation:

Because of air core, inductance is constant.

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