FCC Commercial Element 3 pool, section 51

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Subelement G

Transmitters

Section 51

Amplifiers-1

351G1

What class of amplifier is distinguished by the presence of output throughout the entire signal cycle and the input never goes into the cutoff region?

Correct Answer
A.
Class A.
B.
Class B.
C.
Class C.
D.
Class D.

351G1

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351G2

What is the distinguishing feature of a Class A amplifier?

A.
Output for less than 180 degrees of the signal cycle.
Correct Answer
B.
Output for the entire 360 degrees of the signal cycle.
C.
Output for more than 180 degrees and less than 360 degrees of the signal cycle.
D.
Output for exactly 180 degrees of the input signal cycle.

351G2

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351G3

Which class of amplifier has the highest linearity and least distortion?

Correct Answer
A.
Class A.
B.
Class B.
C.
Class C.
D.
Class AB.

351G3

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351G4

Which class of amplifier provides the highest efficiency?

A.
Class A.
B.
Class B.
Correct Answer
C.
Class C.
D.
Class AB.

351G4

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351G5

What class of amplifier is distinguished by the bias being set well beyond cutoff?

A.
Class A.
Correct Answer
B.
Class C.
C.
Class B.
D.
Class AB.

351G5

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351G6

Which class of amplifier has an operating angle of more than 180 degrees but less than 360 degrees when driven by a sine wave signal?

A.
Class A.
B.
Class B.
C.
Class C.
Correct Answer
D.
Class AB.

351G6

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