Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-002-003
In a grounded grid amplifier using a triode vacuum tube, the input signal is applied to:
- A the filament leads
- B the cathode
- C the plate
- D the control grid
Correct answer: B — the cathode. From the official ISED question bank, verified word for word.
Why
In a grounded grid amplifier, the control grid is held at a fixed voltage, so the input signal must enter through the cathode to control the flow of electrons toward the plate. 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.