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Canadian Advanced Exam Question Bank

effective 4/01/2007

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A-002-06: Amplifiers - classes A, AB, B and C

A-002-06-01: For what portion of a signal cycle does a Class A amplifier operate?

The entire cycle

Exactly 180 degrees

More than 180 degrees but less than 360 degrees

Less than 180 degrees



A-002-06-02: Which class of amplifier has the highest linearity and least distortion?

Class A

Class AB

Class B

Class C



A-002-06-03: For what portion of a cycle does a Class AB amplifier operate?

More than 180 degrees but less than 360 degrees

Exactly 180 degrees

The entire cycle

Less than 180 degrees



A-002-06-04: For what portion of a cycle does a Class B amplifier operate?

180 degrees

Less than 180 degrees

More than 180 degrees but less than 360 degrees

The entire cycle



A-002-06-05: For what portion of a signal cycle does a Class C amplifier operate?

Less than 180 degrees

More than 180 degrees but less than 360 degrees

The entire cycle

180 degrees



A-002-06-06: Which class of amplifier provides the highest efficiency?

Class C

Class A

Class AB

Class B



A-002-06-07: In order to provide the greatest efficiency in the output stage of a CW, RTTY or FM transmitter, you would operate the amplifier:

Class C

Class AB

Class B

Class A



A-002-06-08: Which class of amplifier provides the least efficiency?

Class A

Class C

Class B

Class AB



A-002-06-09: Which class of amplifier has the poorest linearity and the most distortion?

Class C

Class AB

Class A

Class B



A-002-06-10: Which class of amplifier operates over the full cycle?

Class A

Class AB

Class B

Class C



A-002-06-11: Which class of amplifier operates over less than 180 degrees of the cycle?

Class C

Class AB

Class A

Class B





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