Advanced Qualification · A-002 Advanced components and circuits · A-002-006-007
Which of the following classes of amplifier would provide the highest efficiency in the output stage of a CW, RTTY or FM transmitter?
- AClass C
- BClass AB
- CClass B
- DClass A
Correct answer: A — Class C. From the official ISED question bank, verified word for word.
Why
Class C amplifiers are the most efficient choice for constant-envelope signals like CW, RTTY, or FM because they conduct for less than half of the input cycle, wasting very little energy as heat. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced components and circuits is section A-002 of the Advanced exam: Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.
Drill A-002 — free, no account