Oscillators MCQ Quiz in தமிழ் - Objective Question with Answer for Oscillators - இலவச PDF ஐப் பதிவிறக்கவும்

• A blocking oscillator used to produce narrow pulses or trigger pulses it is also called Saw-tooth wave oscillator
• When we take feedback from the output signal, it blocks the feedback, after a cycle, for certain predetermined time

Relaxation oscillators

• A relaxation oscillator is a non-linear oscillator that can generate a non-sinusoidal periodic waveform at its output.
• The non-sinusoidal periodic waveform can be saw-tooth, triangular, or square.
• A relaxation oscillator operates in such a way that it generates oscillations by charging the capacitor and quickly discharging it after attaining a pre-determined threshold voltage.
• UJT and OP-AMP are generally used as relaxation oscillators

​.Circuit diagram of relaxation oscillator:

The waveform of the relaxation oscillator is:

Multivibrator:

• In each state, one transistor is switched on and the other is switched off
• A multivibrator circuit oscillates between a “HIGH” state and a “LOW” state producing a continuous output

• Colpitts oscillator consists of two inductors and one capacitor
• Capacitor with a centre tap is used in feedback system of Colpitts oscillator
• It is used for generation of sinusoidal output signals with very high frequencies

• Positive Feedback is preferred in oscillators as it provides positive gain to the system.
• It will improve the overall system gain.
• For oscillators the gain should be at maximum to have sustained oscillations.