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147 lines
1.8 KiB
Plaintext
147 lines
1.8 KiB
Plaintext
% FILENAME = N14.TXT
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% Decibels, Amplification and Attenuation
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% Release version 2 December 1999
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%Question: 1
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#14.1 The input to an amplifier is 1 volt rms and the output 10 volt rms. This is an
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increase of:
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3 dB
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6 dB
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10 dB
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20 dB
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% ans 4
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%Question: 2
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#14.2 The input to an amplifier is 1 volt rms and output 100 volt rms. This is an
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increase of:
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10 dB
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20 dB
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40 dB
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100 dB
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% ans 3
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%Question: 3
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#14.3 An amplifier has a gain of 40 dB. The ratio of the rms output voltage to the rms
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input voltage is:
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20
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40
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100
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400
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% ans 3
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%Question: 4
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#14.4 A transmitter power amplifier has a gain of 20 dB. The ratio of the output
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power to the input power is:
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10
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20
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40
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100
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% ans 4
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%Question: 5
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#14.5 An attenuator network comprises two 100 ohm resistors in series with the input
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applied across both resistors and the output taken from across one of them. The
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voltage attenuation of the network is:
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3 dB
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6 dB
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50 dB
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100 dB
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% ans 2
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%Question: 6
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#14.6 An attenuator network has 10 volt rms applied to its input with 1 volt rms
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measured at its output. The attenuation of the network is:
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6 dB
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10 dB
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20 dB
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40 dB
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% ans 3
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%Question: 7
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#14.7 An attenuator network has 10 volt rms applied to its input with 5 volt rms
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measured at its output. The attenuation of the network is:
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6 dB
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10 dB
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20 dB
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40 dB
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% ans 1
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%Question: 8
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#14.8 Two amplifiers with gains of 10 dB and 40 dB are connected in cascade. The
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gain of the combination is:
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8 dB
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30 dB
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50 dB
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400 dB
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% ans 3
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%Question: 9
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#14.9 An amplifier with a gain of 20 dB has a -10 dB attenuator connected in cascade.
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The gain of the combination is:
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8 dB
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10 dB
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-10 dB
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-200 dB
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% ans 2
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%Question: 10
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#14.10 Each stage of a three-stage amplifier provides 5 dB gain. The total
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amplification is:
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10 dB
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15 dB
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25 dB
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125 dB
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% ans 2
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