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Oscillators - Questions and Answers

Practice questions on Oscillators.

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6. The condition for an amplifier to work as an oscillator is, that the feedback fraction β should be
A. positive
B. negative
C. equal to the amplifier gain
D. positive and equal to the reciprocal of the amplifier gain
Explanation:
7. One of the following is the essential part of an oscillatory circuit
A. inductor and resistor in series
B. resistor and capacitor in series
C. resistor and capacitor in parallel
D. inductor and capacitor in parallel
Explanation:
8. The total phase difference between input and output voltage is of Hartley oscillator is
A. 90°
B. 180°
C. 270°
D. 360°
Explanation:
9. If A be the stage gain in an oscillator, then the feedback ratio β should be equal to
A. A
B. 1/A
C. A2
D.
Explanation:
10. Radiation of electrical energy is possible only at frequencies above
A. 20 kHz
B. 200 Hz
C. 20 MHz
D. 200 kHz
Explanation:
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