Free RCDD Exam Braindumps (page: 3)

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

  1. 3 dB
  2. 20 dB
  3. 30 dB
  4. 40 dB
  5. 1000 dB

Answer(s): C



Two sinusoidal signals have the same amplitude (A) and the same frequency (f). They differ in phase by 180 degrees. If these two signals are added together, the result is a sinusoidal signal having an amplitude of:

  1. Zero
  2. 0.707A and a frequency of f
  3. A and a frequency of 2f
  4. 2A and a frequency of f
  5. 2A and a frequency of 2f

Answer(s): A



Which of the following correctly lists the lowest frequency band to the highest frequency band?

  1. MF, HF, VHF, UHF
  2. UHF, VHF, HF, MF
  3. HF, MF, UHF, VHF
  4. VHF, UHF, MF, HF
  5. HF, MF, UHF, VHF

Answer(s): A



The conversion of an analog speech signal to a pulse code modulation (PCM) digital signal involves all of the following steps EXCEPT:

  1. Low pass filtering
  2. Periodic sampling
  3. Quantizing
  4. Companding
  5. Amplitude modulation

Answer(s): E






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