19. Applications of Switch

Question.10

On a piece of industrial equipment or a high-security control panel, there is a switch that has a hole for a metal key. You cannot turn the machine on unless you insert the correct key and rotate it.

What is the name of this switch, and why do engineers use it?

Rotary Switch: Used to choose between many different speeds or modes.
Key-Lock Switch: Used to prevent unauthorised people from starting the machine.
Limit Switch: Used to detect when a machine arm has moved too far.
Tactile Switch: Used as a small reset button for a computer.

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