Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-008-001
What digital code consists of elements having unequal length?
- A ASCII
- B Varicode
- C AX.25
- D Baudot
Correct answer: B — Varicode. From the official ISED question bank, verified word for word.
Why
Varicode is the right choice because it uses bits of different lengths to represent characters, making common letters shorter and rare ones longer to speed up transmission. 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.