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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The California doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The CA CDL doubles triples test covers the following sections of the California CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this CA CDL practice test now to prepare for the actual test!
1.
Empty trucks:
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may have poor traction.
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require shorter stopping distances than fully-loaded trucks.
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have better traction than fully-loaded trucks.
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2.
Right after it starts to rain, the road is very slippery. Why?
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Because black ice may form on the road.
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Because the water mixes with oil left on the road by vehicles.
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Because rain is very slippery.
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3.
With an engine fire, you should:
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not shoot foam from the vehicle’s underside.
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open the hood as soon as possible.
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turn the engine off as soon as possible.
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4.
If you have to drive off the road, you should:
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keep one set of wheels on the pavement, if possible.
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fully apply the brakes until your speed has dropped to about 20 mph.
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brake as hard as you can to maintain control.
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5.
When you double your speed, the braking distance is:
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the same.
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3 times longer.
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4 times longer.
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6.
What happens when the center of gravity of a truck moves higher up from the road?
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It is easier it is to turn around corners.
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The truck becomes easier to turn over.
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The vehicle is more stable while turning.
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7.
When driving a 50-foot truck at 40 mph, your minimum following distance should be:
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5 seconds
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6 seconds
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4 seconds
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8.
Which of the following is a good way to avoid becoming an aggressive driver?
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Keep your following distance reasonable.
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Be realistic about your travel time.
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All of the above.
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9.
When coupling twin trailers, the more heavily loaded semitrailer should:
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be in the rear.
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be in first position behind the tractor.
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have its brakes locked.
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10.
Air tanks usually hold enough compressed air to allow the brakes to be used _________ even if the compressor stops working.
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for one day
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several times
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for one stop
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