FCC Commercial Element 3 pool, section 7

Subelement A

Principles

Section 7

Waveforms

37A1

What is a sine wave?

A.
A constant-voltage, varying-current wave.
Correct Answer
B.
A wave whose amplitude at any given instant can be represented by the projection of a point on a wheel rotating at a uniform speed.
C.
A wave following the laws of the trigonometric tangent function.
D.
A wave whose polarity changes in a random manner.

37A1

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37A2

How many degrees are there in one complete sine wave cycle?

37A2

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37A3

What type of wave is made up of sine waves of the fundamental frequency and all the odd harmonics?

37A3

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37A4

What is the description of a square wave?

A.
A wave with only 300 degrees in one cycle.
B.
A wave whose periodic function is always negative.
C.
A wave whose periodic function is always positive.
Correct Answer
D.
A wave that abruptly changes back and forth between two voltage levels and stays at these levels for equal amounts of time.

37A4

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37A5

What type of wave is made up of sine waves at the fundamental frequency and all the harmonics?

37A5

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37A6

What type of wave is characterized by a rise time significantly faster than the fall time (or vice versa)?

37A6

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