Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-002-006
In a grounded grid amplifier using a triode vacuum tube, the cathode is connected to a radio frequency choke. The other end of the radio frequency choke connects to the:
- A B+ (high voltage)
- B B- (bias)
- C ground
- D filament voltage
Correct answer: B — B- (bias). From the official ISED question bank, verified word for word.
Why
In a grounded grid amplifier, the cathode must be held at a steady negative voltage relative to the grid to control current flow, which is why the radio frequency choke connects to B- (bias). 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.