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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.
When coupling double trailers, if the second trailer does not have spring brakes, to set the trailer emergency brakes you should:
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1. Disconnect the emergency line 2. Drive the tractor close to the trailer 3. Charge the trailer air tank 4. Connect the emergency line.
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1. Connect the emergency line 2. Drive the tractor close to the trailer 3. Disconnect the emergency line 4. Charge the trailer air tank.
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1. Drive the tractor close to the trailer 2. Connect the emergency line 3. Charge the trailer air tank 4. Disconnect the emergency line.
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2.
In vehicles with air brakes, the two markings on a front brake limiting valve are:
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normal and slippery.
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left and right.
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high and low.
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3.
You can release dolly brakes:
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by opening the air tank petcock.
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by closing the emergency line valve.
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by opening the service line valve.
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4.
Because of the "crack-the-whip" effect, doubles and triples:
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are more likely to run out of gas than other combination vehicles.
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are more likely to turn over than other combination vehicles.
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are much slower than other combination vehicles.
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5.
To make the brakes work, air brakes use:
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compressed air.
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hydraulic air.
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nitrogen.
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6.
To avoid becoming an aggressive driver you should:
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make gestures to other drivers.
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give other drivers the benefit of the doubt.
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give other drivers your full attention.
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7.
When driving a double or triple, you should:
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decrease your following distance.
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increase your following distance.
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drive in the left lane whenever possible.
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8.
When coupling a double or triple, ________ should be attached last.
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the middle trailer.
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the trailer right behind the cab.
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None of the above.
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9.
When the spring brakes are on, you should:
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pump the brakes.
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not push the brake pedal down.
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press the accelerator.
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10.
When a tire fails, you should:
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brake in a way that will keep your
vehicle in a straight line.
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stay off the brake.
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push the brake pedal down gradually.
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