Discussion
The number of harmonics in addition to base frequency present in the output of a tuned oscillator are :
Answer: C
The number of harmonics is 0.
A tuned (LC) oscillator uses a resonant tank circuit as its frequency-selective network. The tank presents high impedance and supports oscillation only at its resonant frequency, so the ideal output is a pure sinusoid at that single frequency, with no harmonics added to the fundamental.
Practical oscillators show some harmonic distortion from the non-linearity of the active device, but the high-Q tank suppresses it, which is why the textbook answer is that no harmonics accompany the base frequency. Options giving 1, 2 or 5 harmonics describe non-sinusoidal, relaxation-type outputs.
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