Electronics and Communication Engineering - Electronic Devices and Circuits
Exercise :: Electronic Devices and Circuits - Section 15
| 41. |
CE saturation resistance of n-p-n transistor is |
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. |
Answer: Option A
Explanation:
|
| 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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