-
In respect of the block diagram shown in the figure below, the input power is 1 mW. The output power PO will be—
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- 2 mW
- 1mW
- 0.5 mW
- 0
Correct Option: B
Here, decibel gain of a system consists of several subsystems in cascade. And the resultant gain will be the sum of decibel given of all the constituent sub systems.
i.e. 10 – 6 + 2 – 6 = 0 dB
It means the input and output power levels would be same since.
given in
| dB = 10log10 | |
| Pi |
or
| 0 = 10log10 | |
| Pi |
or
| 100= | |
| Pi |
or
or P0 = Pi = 1 mW
Hence alternative (B) is the correct choice.
