Free CDL Combination Vehicles Practice Test

Master Coupling & Uncoupling Procedures

Are you prepared for the CDL Combination Vehicles Endorsement exam? This free CDL practice test covers everything from coupling and uncoupling to trailer inspections, air brake systems, and vehicle handling. Designed for Class A CDL applicants, these real-world questions will help you boost your confidence and pass on the first try!

There are two things that a driver can do to prevent a rollover. They are: (1) keep the cargos as close to the ground as possible; and (2):(Required)

Keep both hands firmly on the steering wheel.

Make sure that the brakes are properly adjusted.

Go slow around turns.

Glad hands are usually connecting which of these?(Required)

Kingpin from the trailer to the locking jaws of the fifth wheel.

Electric lines from the tractor to trailer.

Service and emergency air lines from the vehicle to the trailer.

If the service line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away?(Required)

Nothing is likely to happen until you try to apply the brakes.

The emergency trailer brakes will come on.

The trailer's tank will exhaust through the open line.

Where should the tractor be when you inspect landing gear after uncoupling the trailer?(Required)

With the tractor frame under the trailer.

Completely cleared from the trailer.

With the fifth wheel directly beneath the kingpin.

While driving behind another vehicle under good conditions, you should allow at least one second between your vehicle and the vehicle ahead for each __________ (how many) feet of your vehicle length?(Required)

The safest way to make a turn without entering another traffic lane is:(Required)

You should turn wide as you complete the turn.

You should turn wide before you start the turn.

You should not make a turn and move to another place where you can make a turn without crossing other lane.

The air brake leakage rate for a combination vehicle (engine off, brakes off) should be less than __________ psi per minute.(Required)

1/2

The higher the center of gravity of your truck, the:(Required)

More stable while turning.

Easier to turn over.

Easier to turn around the corner.

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Addison Classroom:

1250 W. Lake St, Addison, IL 60101

Elgin Classroom:

665 Tollgate Rd, Elgin, IL 60123

Driving Range:

1800 W Hawthorne Ln, West Chicago, IL 60185

Free CDL Combination Vehicles Practice Test

Master Coupling & Uncoupling Procedures

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