Combination Quiz 2

What is a tractor protection valve?

• A valve to keep air in the brake system should there be a bad leak

• A valve that prevents the truck from being stolen

• A valve that prevents the driver from going too fast

• A valve that prevents the trailer from accidentally being released

To help prevent rollovers, you should:

• Accelerate quickly after stopping.

• Drive slowly around turns.

• Keep the load near the back of the trailer.

• Keep the load on one side of the trailer.

When coupling a trailer:

• Make sure to couple matching glad hands.

• Any glad hand can be connected to any other glad hand.

• It is best to leave one glad hand unattached.

• Only one set of glad hands should be connected.

Rollovers happen when:

• A truck driver is driving too fast.

• The driver of a vehicle in front of a truck is moving too slowly.

• A truck driver is driving too slowly.

• ABS is working effectively.

The service air line is attached to the:

• Relay valves.

• Supply line.

• Emergency air line.

• Steering wheel.

When driving a bobtail tractor, you should be aware that:

• Bobtails stop very easily.

• Bobtails cannot drive as fast as tractors with semitrailers.

• Bobtails are more difficult to stop than tractors with semitrailers.

• Bobtails are illegal in most states.

Large combination vehicles take the longest amount of time to stop:

• When mostly loaded

• When Empty

• When partially loaded

• When fully loaded

In a double or triple combination:

• Cargo weight must be evenly distributed between all trailers.

• The heaviest trailer should be positioned directly behind the cab.

• The heaviest trailer should be positioned in the rear.

• The weight of the trailers does not matter.

Before backing your tractor under the trailer, make sure your trailer brakes are:

• Disengaged.

• Locked.

• Deactivated.

• Dry.

The best way to recognize that your trailer has begun to skid is by:

• Seeing other drivers' faces.

• Seeing it in your mirrors.

• Feeling it.

• Listening to the radio.