Electronics and Communication Engineering - Materials and Components

41. 

In a virgin specimen of iron, the direction of spontaneous magnetisation varies from domain to domain.

A. True
B. False

Answer: Option A

Explanation:

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42. 

Which of the following is used in lightning arresters?

A. Thermistor
B. Photoconductor
C. Transistor
D. Varistor

Answer: Option D

Explanation:

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43. 

High frequency inductors and capacitors are commonly plated with silver. The main purpose of this is to

A. reduce dc resistance
B. reduce ac resistance
C. increase dc resistance
D. increase ac resistance

Answer: Option B

Explanation:

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44. 

In its lowest state, the electron is bound to the field of proton by an energy equal to

A. 100.5 eV
B. 51.2 eV
C. 13.6 eV
D. 0.2 eV

Answer: Option C

Explanation:

13.6 eV is required to ionize hydrogen atom.


45. 

In a ferromagnetic material, the internal field seen by a dipole is

A. equal to applied field
B. equal to applied field minus a contribution from neighbouring dipoles
C. equal to applied field plus a contribution from neighbouring dipoles
D. equal to or less than applied field

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.