What is the main function of an oscillator?
C
Generate a periodic waveform
Analysis & Theory
Oscillators generate continuous, periodic waveforms (sine, square, etc.) without any external input signal.
Which of the following is NOT a type of oscillator?
Analysis & Theory
Transformer oscillator is not a standard type. RC, LC, and crystal oscillators are commonly used.
Which component determines the frequency in an LC oscillator?
Analysis & Theory
The frequency is determined by the values of the inductor (L) and capacitor (C).
Which oscillator is suitable for high-frequency and high-stability applications?
Analysis & Theory
Crystal oscillators provide excellent frequency stability and are used in clocks, computers, etc.
The feedback in an oscillator circuit must be:
Analysis & Theory
Oscillators require positive feedback to sustain continuous oscillations.
Which oscillator uses a quartz crystal to control frequency?
B
RC phase shift oscillator
Analysis & Theory
Crystal oscillators use quartz crystals for highly accurate frequency control.
What is the Barkhausen criterion for oscillation?
A
Loop gain < 1 and phase shift = 180°
B
Loop gain > 1 and phase shift = 90°
C
Loop gain = 1 and total phase shift = 0° or 360°
D
Loop gain = 0 and no phase shift
Analysis & Theory
Barkhausen criterion requires the loop gain to be 1 and total phase shift around the loop to be 0° or 360°.
Which oscillator is commonly used in audio frequency applications?
Analysis & Theory
Wien bridge oscillator is used for generating audio-frequency signals with low distortion.
Which oscillator uses a tapped inductor for feedback?
Analysis & Theory
Hartley oscillator uses a single inductor with a tap (or two inductors) and a capacitor to determine frequency.
Which oscillator uses split capacitors in its feedback network?
Analysis & Theory
Colpitts oscillator uses a tank circuit with two capacitors and one inductor.