1 . When glad hands are coupled, the seals should be pressed together at a ____ angle.

50-degree
180-degree
90-degree
Click Here
Full Cheat Sheet

2 . Keeping cargo low can:

Prevent a rollover.
Help you drive faster.
Make turns more dangerous.
Take a FREE Practice Test Now

3 . 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.
Take a FREE Practice Test Now

4 . If you press the tractor air supply control and your trailer's spring brakes do not release, you should:

Inspect the air line connections.
Activate the Anti-Lock Braking System.
Turn the engine off and on again.
Take a FREE Practice Test Now

5 . Before beginning a trip, you should:

Leave the service line valve open.
Remove the relay valves.
Close the emergency line valve.
Click Here
Full Cheat Sheet

6 . Combination vehicles need extra space on the road because they:

Drive more slowly than other commercial motor vehicles.
Are heavier than other commercial motor vehicles.
Need more space to turn and stop than other commercial motor vehicles.
Take a FREE Practice Test Now

7 . After connecting the air lines to the trailer while coupling, you should:

Supply air to the trailer.
Chock the wheels.
Inspect the fifth wheel.
Take a FREE Practice Test Now

8 . In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when air pressure drops to a level between:

20 and 45 psi.
75 and 105 psi.
50 and 65 psi.
Take a FREE Practice Test Now

9 . The service air line is attached to the:

Relay valves.
Supply line.
Emergency air line.
Click Here
Full Cheat Sheet

10 . While inspecting coupling, you should go under the trailer and:

Detach the jaws from around the kingpin.
Make sure the locking lever is in the "emergency" position.
Look into the back of the fifth wheel.
Take a FREE Practice Test Now

11 . Before a drive, ensure that air flows to all trailers by:

Opening the rear shut-off valves and listening for escaping air.
Closing the rear shut-off valves and listening for escaping air.
Disconnecting air supply lines and listening for escaping air.
Rolling each trailer down a hill and testing the brakes.
Take a FREE Practice Test Now
Study tip:

Reduce your study time from hours to minutes with a DMV exam “Cheat Sheet”

99.2% of people who use the cheat sheet pass the FIRST TIME

Click Here
Full Cheat Sheet

12 . Pull out the trailer air supply control to test:

The parking brake.
The trailer emergency brakes.
The trailer service brakes.
The landing gear.
Take a FREE Practice Test Now

13 . Maintain a following distance of at least ____ for every 10 feet of your vehicle if you are traveling at a speed under 40 mph.

One second
Two seconds
Three seconds
Click Here
Full Cheat Sheet

14 . When entering or crossing traffic while driving a combination vehicle, it is especially important that you:

Sound your horn.
Make sure there is a large enough gap for your vehicle.
Expect other drivers to make room for your vehicle.
Take a FREE Practice Test Now

15 . The service air line is often controlled by the foot brake and is attached to the ____ valves.

Relay
Supply
Emergency
Take a FREE Practice Test Now

16 . To find out if a vehicle that was built before 1998 has an Anti-Lock Braking System (ABS), you can:

Pump the air brakes to activate the ABS.
Look into the back of the fifth wheel.
Check for wheel speed sensors coming from the back of the brakes.
Take a FREE Practice Test Now

17 . If you use the trailer hand brake while your trailer is skidding, it will:

Stop the skid.
Straighten the trailer.
Continue the skid.
Click Here
Full Cheat Sheet

18 . When backing up your tractor while coupling it to a trailer, the trailer brakes should be:

Deactivated.
Locked.
Unlocked.
Take a FREE Practice Test Now

19 . If the emergency air line loses pressure:

The Anti-Lock Braking System will activate.
The service air line will activate.
The emergency brakes will activate.
Take a FREE Practice Test Now

20 . Avoid needing to make sudden lane changes by:

Using your horn to encourage other drivers to move out of your lane.
Only driving slower than the posted speed limit.
Watching the road ahead while driving.
Take a FREE Practice Test Now