Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-007-004
How many bits are required to provide 256 discrete levels, or a ratio of 256:1?
- A16 bits
- B4 bits
- C8 bits
- D6 bits
Correct answer: C — 8 bits. From the official ISED question bank, verified word for word.
Why
Eight bits are needed because each bit doubles the number of possible states, and multiplying two by itself eight times equals exactly 256 distinct levels. The full explanation — and one for every question — is in Pro.
Practise this section
Transmitters, modulation and processing is section A-005 of the Advanced exam: Transmitters, modulation and processing: AM, FM, SSB, keying, speech processing, and the numbers behind occupied bandwidth.
Drill A-005 — free, no account