Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-002-004
In a grounded grid amplifier using a triode vacuum tube, the plate is connected to the pi-network through a:
- A blocking capacitor
- B by-pass capacitor
- C tuning capacitor
- D electrolytic capacitor
Correct answer: A — blocking capacitor. From the official ISED question bank, verified word for word.
Why
In a grounded grid amplifier, the plate needs to send radio frequency energy to the antenna system while keeping the high direct current voltage from damaging the tuning circuit. 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.