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:
|
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:
|
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:
|
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:
|