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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 9
31.
In a valence crystal, the valence electrons
are not shared
are shared between neighbouring atoms
are shared by all atoms
any of the above
Answer: Option
Explanation:

In true valence crystals the binding between the atoms is accomplished by the sharing of valence electrons.

This sharing can only be between neighbouring atoms only.

32.
Transformer oil is
refined vegetable oil
refined mineral oil
mixture of vegetable and mineral oil
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.

Assertion (A): Drift velocity of electrons is proportional to the applied electric field E.

Reason (R): The average drift velocity per unit field is called mobility.

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.
34.
The materials having low retentivity are suitable for making
temporary smagnets
weak magnets
permanent magnets
both temporary and permanent magnets
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
If ∈r = ∈r' - j∈r" tan δ = .
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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