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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 Washington doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The WA CDL doubles triples test covers the following sections of the Washington CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this WA CDL practice test now to prepare for the actual test!
1. ABS helps you:
drive faster.
brake harder.
None of the above.
2. As you approach off ramps and on ramps, remember:
that the posted speed limit may be safe for automobiles, but may not be safe for larger vehicles.
that braking and turning at the same time can be a dangerous.
All of the above.
3. When should you downshift automatic transmissions?
Watch your tachometer, and downshift when your engine reaches the top of the range.
When you start to get drowsy.
When going down steep grades.
4. Dollies with ABS are required to have a malfunction lamp:
on the rear.
on the left side.
on the right side.
5. When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
rearward amplification.
the rear trailer of a triple.
strong wind.
6. On dry pavement, the braking distance when travelling at 55 mph is about:
142 feet.
419 feet.
216 feet.
7. Which of the following is not a sign of fatigue?
Frequent blinking
Keeping a steady speed
Rubbing eyes
8. When the wheels of a trailer lock up:
the trailer will tend to swing around.
ABS will increase stopping power.
the vehicle will gradually come to a complete stop.
9. If the engine catches fire, you should:
open the hood as soon as you can.
turn off the engine as soon as you can.
avoid shooting foam from the vehicle's underside.
10. When driving a 50-foot truck at 40 mph, your minimum following distance should be:
6 seconds
4 seconds
5 seconds
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WA CDL Doubles Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
Number of questions: 20
Correct answers to pass:16
Passing score:80%
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