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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.
While driving, you should use your mirrors to:
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check where the rear of your vehicle is while you make turns.
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know where other vehicles are around you.
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All of the above.
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2.
During your inspection, you should look into the fifth-wheel gap and check that the _________ are fully closed around the kingpin.
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locking jaws
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couplings (U-joints)
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mounting bolts
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3.
Older trailers do not have spring brakes. If the air supply leaks away:
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the trailer will stop normally.
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the ABS won't work properly.
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there will be no emergency brakes.
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4.
When a vehicle goes around a corner, the rear wheels:
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follow the same path as the front wheels.
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will turn freely.
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follow a different path than the front wheels.
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5.
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:
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partly engage the clutch before you take your right foot off the brake.
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shift down to a speed that you can control without using the brakes.
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use the parking brake to hold the vehicle until the clutch engages.
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6.
Banked curves:
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have a safe "design speed".
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can be taken at any speed.
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should always be avoided.
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7.
Which of these statements is true?
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Large combination vehicles take longer to stop when they are fully loaded than when they are empty.
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"Bobtail" tractors can take longer to stop than a combination vehicle loaded to maximum gross weight.
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Trailer skids are more likely to happen when the trailer is empty or lightly loaded.
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8.
When the wheels of a trailer lock up:
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the trailer will tend to swing around.
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ABS will increase stopping power.
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the vehicle will gradually come to a complete stop.
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9.
A trailer jackknife is more likely to happen when the trailer is:
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loaded to its full capacity.
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empty.
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overloaded.
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10.
In combination vehicles with air brakes, the trailer air supply control:
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is used to keep the trailer behind the tractor.
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is used to control the tractor protection valve.
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is a coupling devices used to connect the service and emergency air-lines from the tractor to the trailer.
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