Question:
Which of the following can be used in the output circuit of a diode rectifier to filter ac ripples?
Which of the following can be used in the output circuit of a diode rectifier to filter ac ripples?
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Standard filters: Capacitor = Parallel; Inductor = Series. Remember "C is for Cross (Parallel)" and "L is for Line (Series)".
Updated On: Jun 26, 2026
- A capacitor in series with the load
- An inductor in parallel with the load
- A capacitor in parallel with the load
- Both capacitor and inductor in parallel with the load
- Both capacitor and inductor in series with the load
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
A diode rectifier converts AC to pulsating DC. The pulsating DC contains unwanted AC components (ripples). Filter circuits are used to smooth out these ripples.
Step 2: Detailed Explanation:
1. Capacitor Filter: A large capacitor is connected in parallel with the load resistor. Capacitors oppose changes in voltage. During the peak of the pulse, the capacitor charges, and when the voltage drops, it discharges through the load, keeping the output voltage relatively constant.
2. Inductor Filter: An inductor is connected in series with the load. Inductors oppose changes in current, thus smoothing the output.
3. Conclusion: Among the given options, connecting a capacitor in parallel with the load is a standard and effective method to filter AC ripples. Option (A) is wrong because a series capacitor blocks DC. Option (B) is wrong because inductors filter current when in series, not parallel.
Step 3: Final Answer:
A capacitor in parallel with the load is used to filter ripples.
A diode rectifier converts AC to pulsating DC. The pulsating DC contains unwanted AC components (ripples). Filter circuits are used to smooth out these ripples.
Step 2: Detailed Explanation:
1. Capacitor Filter: A large capacitor is connected in parallel with the load resistor. Capacitors oppose changes in voltage. During the peak of the pulse, the capacitor charges, and when the voltage drops, it discharges through the load, keeping the output voltage relatively constant.
2. Inductor Filter: An inductor is connected in series with the load. Inductors oppose changes in current, thus smoothing the output.
3. Conclusion: Among the given options, connecting a capacitor in parallel with the load is a standard and effective method to filter AC ripples. Option (A) is wrong because a series capacitor blocks DC. Option (B) is wrong because inductors filter current when in series, not parallel.
Step 3: Final Answer:
A capacitor in parallel with the load is used to filter ripples.
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