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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 Louisiana doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The LA CDL doubles triples test covers the following sections of the Louisiana CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this LA CDL practice test now to prepare for the actual test!
1. The safety valve installed in the first tank the air compressor pumps air is set to open:
at 30 psi.
if there is too much pressure.
if there is too little pressure.
every 15 minutes.
2. To prevent getting sleepy while driving, you should:
drive alone whenever possible.
close the vent.
keep cool by opening the window.
keep the cab warm.
3. If you must stop on a one-way or divided highway, place your warning devices:
50 feet, 100 feet, and 150 feet toward the approaching traffic.
10 feet, 100 feet, and 200 feet toward the approaching traffic.
10 feet, 50 feet, and 150 feet toward the approaching traffic.
100 feet, 200 feet, and 300 feet toward the approaching traffic.
4. If your trucks has a high center of gravity, which of the following is true for curves?
You should travel at the posted speed limit.
Reduce your speed to a crawl.
You should slow down, as your truck can roll over at the posted speed limit for the curve.
None of the above.
5. Exhaust system parts should NOT:
rub against tires.
be loose.
rub against fuel system parts.
All of the above.
6. If driving a heavy vehicle, you should:
avoid braking.
stay in the right lane.
stay in the left lane.
try to pass other vehicles going uphill.
7. Which of the following is NOT true?
ABS won't compensate for poor brake maintenance.
ABS only comes into play when a wheel would have locked up because of over braking.
ABS will change the way you normally brake.
ABS won't compensate for bad brakes.
8. Empty trucks:
have better traction than fully-loaded trucks.
require shorter stopping distances than fully-loaded trucks.
may have poor traction.
None of the above.
9. The posted speed for a curve that may be safe for a straight truck:
is never safe for a double or triple.
can be ignored when driving a double or triple.
could be too fast for a double or triple.
is likely to be safe for a double or triple.
10. When should you downshift automatic transmissions?
When you start to get drowsy.
Watch your tachometer, and downshift when your engine reaches the top of the range.
When going down steep grades.
When you want to go faster.
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Doubles Triples LA CDL Test

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