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ZLB14
Subelement ZLB
Basic Electrical Theory
Section ZLB14
Decibels, Amplification and Attenuation
ZLB1401
The input to an amplifier is 1 volt rms and the output 10 volt rms. This is an increase of
A.
3 dB
B.
6 dB
C.
10 dB
Correct Answer
D.
20
dB
ZLB1401
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ZLB1402
The input to an amplifier is 1 volt rms and output 100 volt rms. This is an increase of
A.
10 dB
B.
20 dB
Correct Answer
C.
40
dB
D.
100 dB
ZLB1402
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ZLB1403
An amplifier has a gain of 40 dB. The ratio of the rms output voltage to the rms input voltage is
A.
20
B.
40
Correct Answer
C.
100
D.
400
ZLB1403
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ZLB1404
A transmitter power amplifier has a gain of 20 dB. The ratio of the output power to the input power is
A.
10
B.
20
C.
40
Correct Answer
D.
100
ZLB1404
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ZLB1405
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
A.
3 dB
Correct Answer
B.
6
dB
C.
50 dB
D.
100 dB
ZLB1405
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ZLB1406
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
A.
6 dB
B.
10 dB
Correct Answer
C.
20
dB
D.
40 dB
ZLB1406
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ZLB1407
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
A.
6
dB
B.
10 dB
C.
20 dB
D.
40 dB
ZLB1407
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ZLB1408
Two amplifiers with gains of 10 dB and 40 dB are connected in cascade. The gain of the combination is
A.
8 dB
B.
30 dB
Correct Answer
C.
50
dB
D.
400 dB
ZLB1408
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ZLB1409
An amplifier with a gain of 20 dB has a -10 dB attenuator connected in cascade. The gain of the combination is
A.
8 dB
Correct Answer
B.
10 dB
C.
-10 dB
D.
-200 dB
ZLB1409
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ZLB1410
Each stage of a three-stage amplifier provides 5 dB gain. The total amplification is
A.
10 dB
Correct Answer
B.
15
dB
C.
25 dB
D.
125 dB
ZLB1410
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