Advanced Qualification · A-002 Advanced components and circuits · A-002-010-001
What is a NAND gate?
- A A circuit that produces a logic "1" at its output only when all inputs are logic "1"
- B A circuit that produces a logic "0" at its output if some but not all of its inputs are logic "1"
- C A circuit that produces a logic "0" at its output only when all inputs are logic "0"
- D A circuit that produces a logic "0" at its output only when all inputs are logic "1"
Correct answer: D — A circuit that produces a logic "0" at its output only when all inputs are logic "1". From the official ISED question bank, verified word for word.
Why
A NAND gate acts like an AND gate that has been flipped, meaning it outputs a logic "1" for almost every input combination except one specific case. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.