Discussion
Where does a crystal appear inductive?
Answer: C
The crystal is inductive only in the narrow window between series and parallel resonance, and it is that window every Pierce oscillator works in. Below and above it the crystal is capacitive, and the equivalent circuit's inductance is cancelled outside the window by the series capacitance or the holder capacitance. A window a few kilohertz wide at ten megahertz is what makes the frequency so tightly defined.
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