CDL Combination Test (2024) - FREE Maine CDL Practice Test

1. With brake drums, if brakes become too hot:

your ABS will malfunction.
the brakes will supply too much power to the drive wheels.
the brakes may stop working.

2. Inspecting the fifth-wheel does NOT include:

making sure that the fifth-wheel plate is greased as required.
checking the area around the vehicle.
ensuring the fifth wheel is in the proper position for coupling.

3. Which of the following will NOT help you prevent rollover?

Using the controlled braking method.
Keeping the cargo as close to the ground as possible.
Driving slowly around turns.

4. Tar in the road pavement rising to the road surface in very hot weather:

does not affect the road surface or driving conditions.
causes the road to become very slippery.
is very sticky and will slow down your vehicle.

5. When inspecting the cargo, make sure it is:

not overloaded.
secured properly for the first 50 miles after beginning a trip.
piled up.

6. When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?

if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
The air could leak out of the trailer air tank, releasing its emergency brakes.
You may not notice a major leak in the service line until you try to put the brakes on.

7. The tractor protection valve:

keeps air in the tractor brake system should the trailer break away or develop a bad leak.
supplies air to the trailer air tanks.
controls the emergency brakes on combination vehicles.

8. A bridge formula permits:

more maximum axle weight for axles that are closer together.
less maximum axle weight for axles that are far apart.
less maximum axle weight for axles that are close together.

9. If you unlock the pintle hook with the dolly still under the rear trailer:

the brakes could be damaged by the combined forces of the springs and the air pressure.
your vehicle might roll away.
the dolly tow bar may fly up.

10. Which of the following is NOT a warning sign of fatigue?

Heavy eyelids
Frequent blinking
Driving at the speed of the traffic

COMBINATION TEST MAINE - PRACTICE TEST