Question

when should you use \plugging\ to stop the lift truck?

when you leave the lift truck on a ramp or incline.

when you want to stop smoothly and gradually.

whenever you stop the lift truck.

when you want to stop quickly.

Explanation:

Plugging is a braking method that reverses the motor's direction to quickly stop the lift truck. It is not for smooth/gradual stops (that's regular braking), not for all stops (as it's harsh on equipment), and not for parking on ramps (parking brakes are for that). It's specifically for quick stops.

Answer:

When you want to stop quickly.