Control Devices for Machine Control

B.

The correct answer is B. Joystick.

A joystick is an input device that is used for controlling machines such as cranes, trucks, underwater unmanned vehicles, wheelchairs, surveillance cameras, and zero turning radius lawn mowers. It is a handheld device that consists of a stick that can be moved in different directions, and it usually has one or more buttons on it for additional functionality.

Joysticks work by sending signals to the machine they are controlling, which then translates those signals into movements or actions. For example, in a crane, moving the joystick forward or backward may cause the crane to move up or down, while moving it left or right may cause it to swing in that direction.

Joysticks come in different sizes and configurations, depending on the application they are used for. They may have additional features such as force feedback, which provides tactile feedback to the user when the joystick is moved, or programmable buttons that can be customized for specific tasks.

In contrast, the other options listed are not input devices commonly used for controlling machines. PS/2 is a type of computer port used for connecting keyboards and mice to a computer. Microphones are used for recording sound, while AGP (Accelerated Graphics Port) is a type of computer bus used for connecting graphics cards to a computer's motherboard.