Question

a speaker asks who know several times during a presentation what type of rhetorical device is the speakers using​

Answer 1

Answer is — Hypophora.
Explaining:
This rhetorical strategy is used when a writer or speaker asks a question and then immediately provides the answer.

Answer 2

Answer:

Rhetorical question.

Explanation:

they aren't wanting an answer. they just want you to think about the subject on what they keep asking if that makes any sense.