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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Alaska 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 Alaska CDL Manual. Take this practice test now to prepare for the actual AK CDL combination test!
1. Which of the following is NOT part of testing the tractor protection valve?
Charging the trailer air brake system.
Stepping on and off the brake pedal several times to reduce the air pressure in the tanks.
Pulling forward slowly, then applying the trailer brakes.
2. When your vehicle goes around a corner, the rear wheels follow a different path than the front wheels. This is called:
front-rear tracking.
3. Under a pressurized system, the radiator cap:
should never be hot.
should never be removed until the system has cooled.
should be removed when the coolant is hot.
4. At speeds below 40 mph, you should leave at least one second in front of you for each ___ feet of vehicle length.
5. 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.
6. The tractor protection valve:
controls the emergency brakes on combination vehicles.
keeps air in the tractor brake system should the trailer break away or develop a bad leak.
supplies air to the trailer air tanks.
7. Which of the following makes a rollover more likely?
Driving quickly around turns
Keeping the cargo as close to the ground as possible
Keeping the load centered on your rig
8. Blocking and bracing are:
used to keep cargo from sliding and to prevent movement of cargo.
driving techniques used to regain control when your drive wheels start to skid.
coupling devices used to connect the service air lines from the truck or tractor to the trailer.
9. When driving in very hot weather, the heat will increase the chances of:
ABS malfunction.
loss of hydraulic pressure.
tire failure.
10. You are driving a heavy vehicle with a manual transmission, and you have to stop on the shoulder while driving on an uphill grade. When putting your vehicle back in motion up the grade, you should:
use the parking brake to hold the vehicle until the clutch engages.
partly engage the clutch before you take your right foot off the brake.
shift down to a speed that you can control without using the brakes.
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AK CDL Combination Test

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