Electronics and Communication Engineering - Electronic Devices and Circuits

46. 

The Ni-Zn ferrites are used for audio and TV transformers is that

A. they have large saturation magnetisation
B. they are easy to fabricate by rolling
C. they are free from pores and voids
D. they have high electro-resistivity

Answer: Option A

Explanation:

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47. 

Hall's effect can be used to measure

A. magnetic field intensity
B. average number of holes
C. carriers concentration
D. electrostatic field intensity

Answer: Option A

Explanation:

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48. 

For insulators the energy gap is of the order of

A. 0.1 eV
B. 0.7 eV
C. 1.1 eV to 1.2 eV
D. 5 to 15 eV

Answer: Option D

Explanation:

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49. 

When electronic emission occurs due to bombardment of high velocity electrons on a metal surface, it is called secondary emission.

A. True
B. False

Answer: Option A

Explanation:

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50. 

The reverse saturation current depends on the reverse bias.

A. True
B. False

Answer: Option B

Explanation:

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