NEW
Font size
WorksheetsOscillator
Total questions: 15
Worksheet time: 15mins
A practical oscillator requires three basic elements:
Amplifier, feedback network, and frequency-determining network
Amplifier, power supply, and antenna
diode, transistor, and op-amp
Resistor, inductor, and capacitor
In a Phase Shift oscillator, what phase shift does the RC network provide?
90°
180°
120°
60°
A phase-shift oscillator typically requires _____RC stages to produce 180° phase shift.
4
3
2
5
Which oscillator uses both inductor and capacitor for frequency control?
Phase shift oscillator
Hartley oscillator
Crystal oscillator
RC oscillator
Which oscillator uses a pair of capacitors and one inductor?
Hartley
RC Phase Shift
Armstrong
Colpitts
In a crystal oscillator, the frequency stability is achieved by:
Using a large resistor
Using a quartz crystal
Using high gain amplifier
Using variable capacitor
The oscillation frequency of a crystal oscillator mainly depends on
Supply voltage
Amplifier gain
Feedback ratio
Crystal size and cut
What type of feedback is required for oscillation?
Positive feedback
Negative feedback
No feedback
Both positive and negative feedback
According to Barkhausen criterion, the total phase shift around the loop must be
90°
270
0° or 360°
0° or 180°
The frequency of oscillation in an oscillator is determined by
Power supply voltage
Feedback ratio only
Active device gain
Resonant frequency of the tank or RC network
Crystal oscillators are widely used because they provide
Large gain
High frequency
High frequency stability
Low cost
What condition must be met for sustained oscillation according to Barkhausen's criterion?
Loop gain> 1 and total phase shift = 180°
Loop gain >= 1 and total phase shift = 0° or 360°
Feedback must be negative
Loop gain < 1 and phase shift 90°
Which component provides frequency control in an LC oscillator?
Transistor
Capacitor only
Inductor and Capacitor
Resistor
What is the main function of an oscillator?
To convert AC to DC
To amplify input signals
To generate a periodic waveform without input
To store electrical energy
Which of the following is a requirement for oscillation?
Gain < 1
Zero feedback
Barkhausen criterion must be satisfied
Large resistance only
