Oscillators

1. _________.. is a fixed frequency oscillator

1. Phase-shift oscillator
2. Hartely-oscillator
3. Colpitt’s oscillator
4. Crystal oscillator

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2. A second condition for oscillations is _________

1. A gain of 1 around the feedback loop
2. No gain around the feedback loop
3. The attention of the feedback circuit must be one-third
4. The feedback circuit must be capacitive

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3. A Wien bridge oscillator uses _________. feedback

1. Only positive
2. Only negative
3. Both positive and negative
4. None of the above

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4. An important limitation of a crystal oscillator is _________.

1. Its low output
2. Its high Q
3. Less availability of quartz crystal
4. Its high output

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5. An LC oscillator cannot be used to produce _________. frequencies

1. High
2. Audio
3. Very low
4. Very high

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6. An oscillator converts _________.

1. c. power into d.c. power
2. c. power into a.c. power
3. mechanical power into a.c. power
4. none of the above

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7. An oscillator differs from an amplifier because it _________.

1. Has more gain
2. Requires no input signal
3. Requires no d.c. supply
4. Always has the same input

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8. An oscillator employs _________ feedback

1. Positive
2. Negative
3. Neither positive nor negative
4. Data insufficient

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9. An oscillator produces_________.. oscillations

1. Damped
2. Undamped
3. Modulated
4. None of the above

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10. For an oscillator to properly start, the gain around the feedback loop must initially be

1. 1
2. Greater than 1
3. Less than 1
4. Equal to attenuation of feedback circuit

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