Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-002-009
In a grounded grid amplifier using a triode vacuum tube, each side of the filament is connected to a capacitor whose other end is connected to ground. These are:
- Atuning capacitors
- Belectrolytic capacitors
- Cblocking capacitors
- Dby-pass capacitors
Correct answer: D — by-pass capacitors. From the official ISED question bank, verified word for word.
Why
In a grounded grid amplifier, these capacitors provide a low-resistance path for radio frequency energy to flow directly to ground, effectively "bypassing" the filament power supply so it does not interfere with the signal. The full explanation — and one for every question — is in Pro.
Practise this section
Transmitters, modulation and processing is section A-005 of the Advanced exam: Transmitters, modulation and processing: AM, FM, SSB, keying, speech processing, and the numbers behind occupied bandwidth.
Drill A-005 — free, no account