Final answer:
The power divider or inter-axle differential lock in heavy vehicles is typically activated by air pressure, not by centrifugal force, electricity, or engine RPM. It is designed to lock the differentials, allowing equal distribution of power to all driving wheels to improve vehicle stability and traction. Option c is the correct answer.
Step-by-step explanation:
The power divider or inter-axle differential lock on a vehicle is a crucial component in a drivetrain, used particularly in heavy trucks to ensure that power is evenly distributed between the axles for better traction. When activated, it locks the differentials, allowing for equal power to be sent to all driving wheels, which is particularly useful in slippery or off-road conditions where vehicle stability and traction are compromised. It is important to note that while various forces such as centrifugal force, tension, gravity, and friction can cause centripetal acceleration, they are not related to the actuation of this vehicular component.
Usually, the power divider or inter-axle differential lock is activated by air pressure. This system uses compressed air to engage the locking mechanism, which is a standard method in most modern heavy-duty vehicles. The pneumatically activated system is preferred due to its reliability and the ready availability of compressed air in the brake systems of these vehicles.
On the other hand, centrifugal force relates to the force that acts on a body moving in a circular path and is directed towards the center around which the body is moving. Electrical systems and engine RPM may serve various functions within vehicles, but do not typically activate the inter-axle differential lock.
To conclude, the inter-axle differential lock or power divider is generally engaged by air pressure, which is essential for maintaining traction and stability under adverse conditions.