Question

What is a Recognizer?

(a) Finite automata that both respond to events and generate actions

(b) Finite automata that respond to events but generate no actions

(c) All of the mentioned

(d) None of the mentioned

The question was posed to me during an online exam.

My question comes from Designing with State Diagrams topic in section Unified Modelling Language of Software Architecture

Answer 1

The correct choice is (b) Finite automata that respond to events but generate no actions

To elaborate: Finite automata that both respond to events and generate actions are called transducers and finite automata that respond to events but generate no actions are called acceptors, or recognizers.