Question

(iii) In a full-wave rectifier:

• A. Both diodes are forward biased at the same time.
• B. Both diodes are reverse biased at the same time.
• C. One is forward biased and the other is reverse biased at the same time.
• D. Both are forward biased in the first half of the cycle and reverse biased in the second half of the cycle.

Hint:

In a full-wave rectifier, the diodes conduct alternately. When one diode conducts (forward biased), the other blocks current (reverse biased).

Answer 1

The Correct Option is C

Step 1: Principle of operation of a full-wave rectifier.
A full-wave rectifier uses two diodes in a center-tapped transformer configuration or four diodes in a bridge configuration to convert alternating current into direct current. The diodes conduct alternately during the AC cycle.

Step 2: Behavior during the positive half cycle.
When the input voltage is positive, one diode becomes forward biased and conducts current through the load, while the other diode becomes reverse biased and blocks current.

Step 3: Behavior during the negative half cycle.
During the negative half cycle, the roles of the diodes reverse. The previously conducting diode becomes reverse biased and the other diode becomes forward biased, allowing current to flow through the load in the same direction.

Step 4: Conclusion.
Thus, at any given time in a full-wave rectifier, one diode is forward biased while the other is reverse biased.
Final Answer: One is forward biased and the other is reverse biased at the same time.