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Which of the following effect illustrate the basic working of a quartz crystal oscillator?

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Which of the following effect illustrate the basic working of a quartz crystal oscillator?

(a) Photovoltaic effect

(b) Piezo electric effect

(c) Electro-magnetic effect

(d) Electron excitation effect

The question was asked during an interview for a job.

My query is from Crystal Oscillator-2 topic in portion Oscillators of Analog Circuits

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Right choice is (b) Piezo electric effect

To explain: When a voltage source is applied to a quartz crystal, it begins to produce a characteristic known as the Piezo electric effect. It is a property of a crystal by which an electrical charge produces a mechanical force by changing the shape of the crystal and vice versa, a mechanical force applied to the crystal produces an electrical charge.

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