# Oscillators

### Explanation of question 12

- i A crystal can operate on a harmonic of its fundamental frequency
- ii When mechanically stressed, a piezo-electric crystal generates a small voltage

1. i and ii are both true
2. i is true but ii is false
3. i is false but ii is true
4. i and ii are both false

   The answer is :- 1 i is true; ii is true, a feature of piezo-electric crystals.

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