Electronic Devices and Circuit Theory-Oscillator Circuits - Practice Questions

Question 1

For frequencies up to 1 MHz, the ________ is the most widely used type of sinusoidal RC oscillator.

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Question 2

Which of the following is (are) feedback?

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Question 3

The amplifier is unstable if the Nyquist curve plotted encloses (encircles) the –1 point, and it is stable otherwise.

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Question 4

Crystal oscillators are inherently unstable.

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Question 5

Calculate the fr of a lead-lag network if R1 = R2 = 6.8 k, and C1 = C2 = 0.05 F.

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Question 6

In the astable mode, a 555 timer is connected as a free-running relaxation oscillator.

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Question 7

An amplifier with a gain of –500 and a feedback of = –0.1 has a gain change of 15% due to temperature. Calculate the change in gain of the feedback amplifier.

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Question 8

An op-amp integrator has a square-wave input. The output should be

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Question 9

Which of the following oscillators is (are) tuned oscillators?

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Question 10

Oscillators operate on negative feedback.

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