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.
54. Sinusoidal oscillators operate with ________ feedback.
(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 ________.
- Oscillators » Exercise - 1 1. For generating 1 kHz signal, the most suitable circuit is : (a) colpitts oscillator (b) hartley oscillator (c) tuned collector oscillator (d) wien bridge oscillator 2. The feedback factor β at the frequency of oscillation of a Wien bridge oscillator is : (a) 3 (b) 1/3 (c) 1/29 (d) 3/29 3. The use of crystal in a tunable oscillator : (a) improves frequency stability (b) increases the gain of the oscillator (c) helps to obtain optimum output impedance (d) facilitates generation of wide range of frequencies 4. A phase shift oscillator uses : (a) LC tuning (b) piezoelectric crystal (c) balanced bridge (d) variable frequency operation 5. A highly stable resonance characteristic is the property of a …….. oscillator. (a) hartley (b) colpitts (c) crystal (d) wein bridge 6. The main advantage of a crystal oscillator is that its output is : (a) 50Hz to 60Hz (b) variable frequency (c) a constant frequency (d) direct current 7. An oscillator of the LC type that has a split capacitor in the circuit is : (a) hartley oscillator (b) colpitts oscillator (c) wein bridge oscillator (d) R-C phase shift oscillator 8. Wein bridge oscillator can typically generate frequencies in the range of : (a) 1KHz…