Oscillators » Exercise – 2

51. A circuit that can change the frequency of oscillation with an application of a dc voltage is sometimes called ________.

(a) a voltage-controlled oscillator.

(b) a crystal oscillator.

(c) a Hartley oscillator.

(d) an astable multivibrator.

52. Nota

53. Nota

54. Sinusoidal oscillators operate with ________ feedback.

(a) positive

(b) negative

(c) either positive or negative

(d) neither positive nor negative

55. The lead-lag circuit in the Wien-bridge oscillator has a resonant frequency at which the attenuation is ________.

(a) 1/2.

(b) 1/4.

(c) 1/3.

(d) 1/5.

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