A varactor diode is a PN-junction diode operated in reverse bias so that its junction capacitance varies with the applied voltage. This voltage-controlled capacitance can be used for electronic tuning of resonant circuits. In color TV receivers, varactor diodes can therefore be used for electronic tuning of RF and oscillator circuits without requiring a mechanically variable capacitor.
In color TV, a varactor diode is used for ______.
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This question is part of 📡 Electronics and Communication Engineering (ECE) within the broader 🛠️ Engineering Essentials subject and appears in the PTS Pakistan Testing Service preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.