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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 8
46.
Yettrium-iron garnet (Y2Fe5O12) is a soft magnetic material suitable for applications involving
dc
50 Hz ac
ac of a few K Hz
ac of a few hundred MHz
Answer: Option
Explanation:

Yettrium iron garnet has very low eddy current loss. Hence it is used at frequencies in MHz range.

47.
The mass of proton and electron are
1.672 x 10-26 kg and 9.107 x 10-31 kg respectively
9.107 x 10-26 kg and 9.107 x 10-31 kg respectively
9.107 x 10-29 kg and 9.107 x 10-31 kg respectively
9.107 x 10-30 kg and 9.107 x 10-31 kg respectively
Answer: Option
Explanation:
No answer description is available. Let's discuss.
48.
A rare gas having N atoms/m3 is subjected to an electric field E. The electric dipole moment per unit volume is proportional to N and E.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
49.
In an intrinsic semiconductor, at a given temperature T
the number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination
the number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination
the number of electron hole pairs generated per second due to thermal motion is always more than the number of electron-hole pairs lost per second due to recombination
any of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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