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:
- A tuning capacitors
- B electrolytic capacitors
- C blocking capacitors
- D by-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: AM, FM, SSB, keying, speech processing, and the numbers behind occupied bandwidth.