Electronics and Communication Engineering - Electronic Devices and Circuits

41. 

CE saturation resistance of n-p-n transistor is

A.
B.
C.
D.

Answer: Option B

Explanation:

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42. 

In LED the radiation is in

A. visible region
B. infrared region
C. both (a) and (b)
D. neither (a) nor (b)

Answer: Option D

Explanation:

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43. 

The rate of change of excess carrier density is proportional to carrier density.

A. True
B. False

Answer: Option A

Explanation:

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44. 

Tuned voltage amplifiers are not used

A. radio receivers
B. public address system
C. T.V. Receivers
D. band of freq. selected and amplified

Answer: Option B

Explanation:

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45. 

The main reason why Ni-Zn ferrites are used for audio and T.V. transformers is that

A. they have large saturation magnetization
B. they are easy to fabricate by rolling
C. they are totally free from pores and voids
D. they have a high electrical resistivity

Answer: Option A

Explanation:

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