Electrical Engineering XYZ MCQs
Relaxation Voltage controlled oscillators are used to generate:
- Triangular wave
- Sawtooth wave
- Both 1 and 2
- Sinusoidal wave
Correct answer: 3. Both 1 and 2
Explanation:
- Triangular wave: A relaxation oscillator is capable of generating a triangular wave. In a relaxation oscillator, the capacitor charges up to a certain voltage level and then discharges rapidly through a resistor, causing the voltage to drop. This cycle repeats, resulting in a triangular waveform.
- Sawtooth wave: Similarly, a relaxation oscillator can also generate a sawtooth wave. This is achieved by charging the capacitor linearly (instead of exponentially, as in the case of generating a triangular wave) and then discharging it rapidly. The linear charging results in a linear increase in voltage, leading to a sawtooth waveform when the capacitor discharges.
- Sinusoidal wave: While relaxation oscillators primarily produce triangular and sawtooth waves, they can be used as part of a circuit to generate a sinusoidal wave. However, it typically requires additional circuitry such as filters and nonlinear elements to shape the waveform into a sinusoidal shape.
So, the correct answer is “Both 1 and 2”. While relaxation oscillators directly generate triangular and sawtooth waves, with additional circuitry and adjustments, they can also contribute to generating sinusoidal waves indirectly.