36. In order to start up, a feedback oscillator requires ________.
(a) negative feedback less than 1.
(b) positive feedback greater than 1.
(c) unity feedback equal to 1.
(d) no feedback.
37. At series resonance, the impedance of a crystal is ________.
(a) minimum.
(b) maximum.
(c) equal.
(d) zero.
38. What is the minimum frequency at which a crystal will oscillate?
(a) seventh harmonic
(b) third harmonic
(c) fundamental
(d) second harmonic
39. What is the relationship between the series and parallel resonant frequencies of a quartz crystal?
(a) They are equal.
(b) Parallel resonant frequency is approximately 1 kHz higher than series resonant frequency.
(c) Series resonant frequency is approximately 1 kHz higher than parallel resonant frequency.
(d) none of the above
40. At parallel resonance, the impedance of a crystal is ________.
(a) minimum.
(b) maximum.
(c) equal.
(d) zero.
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