An AF amplifier is shielded to ________________?
Correct answer: C. Prevent induction due to stray magnetic fields
- A. Keep the amplifier cool
- B. Protect from rusting
- C. Prevent induction due to stray magnetic fields
- D. None of the above
Explanation
Low-frequency magnetic fields can induce unwanted voltages in amplifier wiring and transformer circuits. A shield or suitable magnetic screening reduces this stray-field induction and the resulting hum or interference.
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