New Zealand NZART pool, section 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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