OSCILLATORS - Practice Mode

1) How many time constants required to change a capacitor to 63.2% of its full charge voltage?

Four time constant Three time constant Two time constant One time constant

Correct Answer: One time constant

2) Which circuits commonly use parallel-fed Hartley oscillators?

Stereo amplifiers Radio receivers Television receivers Automatic voltage stabilizers

Correct Answer: Radio receivers

3) What type of arrangement is required to sustain the oscillations of the oscillator circuit?

Provide negative feedback Provide regenerative feedback Increase the bias voltage Increase the value of inductor

Correct Answer: Provide regenerative feedback

4) What type of feed back is used by the Wein-bridge oscillator to oscillate the signal?

No feedback Positive feedback Negative feedback Both positive and negative feedback

Correct Answer: Both positive and negative feedback

5) How to improve the frequency stability in oscillator circuits?

Increase the supply voltage By using quartz crystal Using L and C Improve the property of circuits

Correct Answer: By using quartz crystal

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