CDL COMBINATION PRACTICE TEST (CO)
11.
You are coupling a tractor to a semi-trailer. You have backed up but are not yet under the trailer. Before backing under the semi-trailer, you should:
|
begin raising the landing gear.
|
|
|
supply air to the trailer system and lock the trailer brakes.
|
|
|
connect the electrical cord and check the air lines.
|
|
|
remove the wheel chocks.
|
12.
If you are feeling sleepy, you should:
|
increase your speed to get to the destination quicker.
|
|
|
slow down and drive on the shoulder of the road.
|
|
|
pull off the road and rest or take a nap.
|
|
|
None of the above.
|
13.
Which of the following is NOT part of testing the tractor protection valve?
|
Shutting off the engine.
|
|
|
Pulling forward slowly, then applying the trailer brakes.
|
|
|
Charging the trailer air brake system.
|
|
|
Stepping on and off the brake pedal several times to reduce the air pressure in the tanks.
|
14.
Dual tires:
|
should come in contact with each other whenever possible.
|
|
|
should not come in contact with each other.
|
|
|
should always come in contact with each other.
|
|
|
are dangerous.
|
15.
If you are being tailgated, you should:
|
turn on your taillights.
|
|
|
try to let the other vehicle pass.
|
|
|
drive on the shoulder.
|
|
|
speed up.
|
16.
The tire load rating is stated:
|
inside the suspension system.
|
|
|
on the side of each tire.
|
|
|
on each axle.
|
|
|
on the dashboard.
|
17.
The crack-the-whip effect:
|
can turn the trailer over.
|
|
|
the ends of some vehicles to drag.
|
|
|
can cause problems for drivers coming toward you.
|
|
|
can cause a vehicle to tilt.
|
18.
Combination vehicles usually:
|
are easier to drive than single than single CMVs.
|
|
|
are shorter than single than single CMVs.
|
|
|
require more driving skill than single CMVs.
|
|
|
All of the above.
|
19.
To test the service brake:
|
gently try to pull forward with the trailer parking brake on, then release the brake.
|
|
|
push the brake pedal firmly while slowly moving backward.
|
|
|
shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
|
|
|
push the brake pedal firmly while going about 5 mph.
|
20.
Containerized loads:
|
must be inspected before and after the trip.
|
|
|
are generally used for freight carried part way by rail or ship.
|
|
|
should exceed gross weight and axle weight limits.
|
|
|
All of the above.
|
GRADE ME
NOT SURE YOU WILL PASS? GET CDL PREMIUM NOW! - Learn More