Red Seal Electrician Practice
Motor controlsQuestion 251 of 1506

How does a pressure switch turn fluid pressure into a switch action?

  1. It spins a paddle wheel inside the pipe
  2. It heats a bimetal strip inside the case
  3. It pushes on a piston, diaphragm or bellows
  4. It switches on an LED beside the contacts
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Correct answer: It pushes on a piston, diaphragm or bellows

A piston, diaphragm or bellows turns the pressure into a mechanical force, and that force moves the contact.

Source: Lessons in Electric Circuits IV: Digital (Kuphaldt), 4.1: Switch Types

Practice motor controls

Questions last reviewed: 18 October 2026