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Drivers who want to drive combination vehicles must pass the combination vehicles test. The California 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 California CDL Manual. Take this practice test now to prepare for the actual CA CDL combination test!
1.
When checking the lights before driving:
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you should turn off the engine.
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make sure the parking brake is not set.
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you should check them from inside the vehicle.
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2.
Emergency lines on combination vehicles are often coded with the color ____ to keep from getting them mixed up with the ____ service line.
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blue; red
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yellow; black
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red; blue
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3.
When coupling a tractor to a semi-trailer, after checking if the fifth-wheel is in proper position for coupling you should:
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connect the electrical cord and check the air lines.
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make sure the area around the vehicle is clear and the trailer wheels are chocked.
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connect the air lines to the trailer.
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4.
If you get stuck on the railroad tracks, the first thing you should do is:
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immediately get out of the cab and move away from the tracks.
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scream for help.
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stay in your vehicle and call 911.
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5.
Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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100 psi
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150 psi
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50 psi
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6.
After a tire has been changed, the driver should stop a short while later to:
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decrease tire pressure.
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check the tightness of the nuts.
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deflate the tire to 10 psi.
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7.
The tractor protection valve:
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supplies air to the trailer air tanks.
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keeps air in the tractor brake system should the trailer break away or develop a bad leak.
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controls the emergency brakes on combination vehicles.
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8.
Foundation brakes are used:
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only with the right wheels.
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only with the front wheels.
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at each wheel.
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9.
If your truck catches fire, the first thing you should do is to:
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pull off the road and park in an open area.
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get the vehicle off the road and park near other vehicles.
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pull into a service station and call for help.
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10.
When you make a quick lane change, the crack-the-whip effect can:
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turn the trailer over.
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improve your traction.
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make it harder to turn without skidding.
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