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What provides a periodic voltage waveform?

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What provides a periodic voltage waveform?

(a) sweep generator

(b) voltmeter

(c) oscillator

(d) amplifier

The question was posed to me by my school teacher while I was bunking the class.

Question is from Basic Principle of Signal Display topic in division Oscilloscopes of Electrical Measurements

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The correct option is (a) sweep generator

The best I can explain: Sweep generator provides a periodic voltage waveform in an oscilloscope. As the waveform resembles the teeth of a hacksaw it is known as a sawtooth waveform.

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