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Subelement A
Principles
Section 7
Waveforms
What is a sine wave?
• A constant-voltage, varying-current wave.
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.
• A wave following the laws of the trigonometric tangent function.
• A wave whose polarity changes in a random manner.
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How many degrees are there in one complete sine wave cycle?
• 90 degrees.
• 270 degrees.
• 180 degrees.
360 degrees.
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What type of wave is made up of sine waves of the fundamental frequency and all the odd harmonics?
Square.
• Sine.
• Cosine.
• Tangent.
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What is the description of a square wave?
• A wave with only 300 degrees in one cycle.
• A wave whose periodic function is always negative.
• A wave whose periodic function is always positive.
A wave that abruptly changes back and forth between two voltage levels and stays at these levels for equal amounts of time.
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What type of wave is made up of sine waves at the fundamental frequency and all the harmonics?
Sawtooth wave.
• Square wave.
• Sine wave.
• Cosine wave.
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What type of wave is characterized by a rise time significantly faster than the fall time (or vice versa)?
• Cosine wave.
• Square wave.