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Subelement ZLB

Basic Electrical Theory

Section ZLB14

Decibels, Amplification and Attenuation

The input to an amplifier is 1 volt rms and the output 10 volt rms. This is an increase of

  • 3 dB
  • 6 dB
  • 10 dB
  • Correct Answer
    20 dB
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The input to an amplifier is 1 volt rms and output 100 volt rms. This is an increase of

  • 10 dB
  • 20 dB
  • Correct Answer
    40 dB
  • 100 dB
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An amplifier has a gain of 40 dB. The ratio of the rms output voltage to the rms input voltage is

  • 20
  • 40
  • Correct Answer
    100
  • 400
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A transmitter power amplifier has a gain of 20 dB. The ratio of the output power to the input power is

  • 10
  • 20
  • 40
  • Correct Answer
    100
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An attenuator network comprises two 100 ohm resistors in series with the input applied across both resistors and the output taken from across one of them. The voltage attenuation of the network is

  • 3 dB
  • Correct Answer
    6 dB
  • 50 dB
  • 100 dB
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An attenuator network has 10 volt rms applied to its input with 1 volt rms measured at its output. The attenuation of the network is

  • 6 dB
  • 10 dB
  • Correct Answer
    20 dB
  • 40 dB
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An attenuator network has 10 volt rms applied to its input with 5 volt rms measured at its output. The attenuation of the network is

  • Correct Answer
    6 dB
  • 10 dB
  • 20 dB
  • 40 dB
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Two amplifiers with gains of 10 dB and 40 dB are connected in cascade. The gain of the combination is

  • 8 dB
  • 30 dB
  • Correct Answer
    50 dB
  • 400 dB
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An amplifier with a gain of 20 dB has a -10 dB attenuator connected in cascade. The gain of the combination is

  • 8 dB
  • Correct Answer
    10 dB
  • -10 dB
  • -200 dB
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Each stage of a three-stage amplifier provides 5 dB gain. The total amplification is

  • 10 dB
  • Correct Answer
    15 dB
  • 25 dB
  • 125 dB
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