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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Kansas CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Kansas CDL Manual. Take this practice test now to prepare for the actual KS CDL combination test!
1. If a load is 50 feet long, the minimum number of tie-downs required is:
2. Over-length loads:
require special driving care.
require special transit permits.
may require special equipment such as "wide load" or flags.
All of the above.
3. If you get stuck on the railroad tracks, the first thing you should do is:
stay in your vehicle and call 911.
try to move your vehicle until you see the train.
scream for help.
immediately get out of the cab and move away from the tracks.
4. When checking the air and electric lines to the trailer, be sure that the air lines are properly connected to the gland hands, and are:
secured with enough air leaks for turns.
secured with enough slack for turns.
properly greased.
None of the above.
5. Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:
shifting into neutral may help slow the vehicle.
the parking brake should never used to slow the vehicle.
pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
All of the above.
6. If you are driving a 30 foot vehicle at 35 mph, you should leave at least _______ between your vehicle and the vehicle in front of you.
4 seconds
2 seconds
3 seconds
1 seconds
7. In combination vehicles with air brakes, the trailer air supply control:
is used to control the tractor protection valve.
supplies air to the trailer air tanks.
is a coupling devices used to connect the service and emergency air-lines from the tractor to the trailer.
is used to keep the trailer behind the tractor.
8. What is the proper following distance for a 50 foot truck traveling at 50 mph?
10 seconds
5 seconds
25 seconds
6 seconds
9. With brake drums, if brakes become too hot:
the brakes may stop working.
your ABS will malfunction.
the brakes will supply too much power to the drive wheels.
the air compressor will kick on to cool the brakes.
10. Enough tread is especially important in winter conditions. You need at least ________ tread depth on steering axle tires.
8/32 inch
2/8 inch
4/32 inch
6/24 inch
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KS CDL Combination Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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