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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.
Strong winds can make it difficult to stay in your lane, especially when:
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coming out of tunnels.
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going into tunnels.
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driving at speeds below 40 mph.
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2.
If a load is 10 feet long, the minimum number of tie-downs required is:
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2
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1
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3
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3.
Glad hands are:
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warning devices.
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coupling devices.
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securement devices.
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4.
The trailer hand valve should be used:
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to check that the trailer is locked onto the tractor.
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to test the trailer brakes.
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to check that the trailer emergency brakes are on.
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5.
If a trailer does not have spring brakes, to keep the trailer from moving you should:
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use the service brakes.
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use wheel chocks.
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park on a slight decline.
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6.
The trolley valve should be used only:
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in driving.
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to test the trailer brakes.
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to prevent skids.
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7.
It's very important to distribute the cargo so it is:
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as low as possible.
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in the centre of the load.
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as high up as possible.
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8.
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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there will be no emergency brakes.
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the ABS won't work properly.
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9.
Brake lag is:
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the amount of air pressure required to stop the vehicle.
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the distance your vehicle will travel, in ideal conditions, while you are braking.
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the time required for the air brakes to work after the brake pedal is pushed.
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10.
The tire load for each tire is stated:
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on the tread of the tire.
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on the inside of the tire.
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on the side of the tire.
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