Same chapter3 marksDifficulty: Medium
Draw the truth table of the NAND gate and explain why it is called a universal gate.
Electronic Devices
3 marksDifficulty: Medium
Distinguish between a half-wave and a full-wave rectifier.
Original Khojo Papers practice question — not from a past board paper.
Answer
A half-wave rectifier uses one diode and conducts during only one half of each cycle, so the output is pulsating with gaps and the efficiency is low. A full-wave rectifier uses two diodes with a centre-tapped transformer, or four in a bridge, and conducts during both halves, so the output has twice the frequency, no gaps and about twice the efficiency.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
A capacitor filter smooths either output.
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