Advanced Qualification · A-002 Advanced components and circuits · A-002-006-006
Which of the following classes of amplifier provides the highest efficiency?
- AClass A
- BClass AB
- CClass B
- DClass C
Correct answer: D — Class C. From the official ISED question bank, verified word for word.
Why
Class C amplifiers achieve the highest efficiency because the active device conducts for less than half of the input signal cycle, meaning it spends most of its time turned off and wasting very little power 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