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Exam RCDD-001 topic 1 question 5 discussion

Actual exam question from BICSI's RCDD-001
Question #: 5
Topic #: 1
[All RCDD-001 Questions]

If the input signal power to a communication system is 1 W and the output power is 1 mW, the system attenuation is:

  • A. 3 dB
  • B. 20 dB
  • C. 30 dB
  • D. 40 dB
  • E. 1000 dB
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Suggested Answer: C 🗳️
by mwasim at Feb. 1, 2022, 1:04 p.m.

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LiONz5
1 year, 4 months ago
From Pg 1-55 equation below should be used for signal in Watts. dB = -10log( P out/P in) = -10log(0.001W/1W) = ±10log(0.001) = ±10(-3) =30
upvoted 2 times
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mwasim
2 years, 2 months ago
Attenuation (A) = 10 log(Pi / Po) Pi=Input power, Po = output power. A= 10 x log (1W/1mW) = 10 x log(1000) = 10 x 3 = 30 dB
upvoted 3 times
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