UK Amateur Radio Full Licence Exam Practice Questions - UK Amateur Radio Full Licence Examination (RSGB Ofcom) Exam

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In the equivalent electrical circuit of a quartz crystal unit, what condition occurs at the series resonant frequency ($f_s$)?

The inductive reactance of the motional arm equals the capacitive reactance of the motional arm, yielding minimum series impedance The total crystal impedance reaches its maximum value The parallel shunt capacitance $C_0$ dominates, blocking all AC current The Q factor of the crystal drops to zero

Correct Answer:

The inductive reactance of the motional arm equals the capacitive reactance of the motional arm, yielding minimum series impedance

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