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CDL DOUBLES PRACTICE TEST LOUISIANA

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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. An alcohol evaporator:
used to reduce the chance of the front wheels skidding.
protects the air brake system from too much pressure.
to hold compressed air.
is used to reduce the risk of ice in air brake valves and other parts during cold weather.
2. As you approach off ramps and on ramps, remember:
that the posted speed limit may not be safe for larger vehicles.
that downgrades make it easier to reduce speed.
to maintain your highway speed.
to always brake and turn at the same time.
3. You can determine if your vehicle is equipped with ABS (anti-lock braking system) by:
checking if your vehicle was manufactured after March 1, 1998.
looking for wheel speed sensor wires coming from the rear of your brakes.
checking for a yellow ABS malfunction lamp on the instrument panel.
All of the above.
4. The ABS malfunction lamp on the instrument panel is:
Red
Orange
Yellow
Blue
5. On dry pavement, the braking distance when travelling at 55 mph is about:
216 feet.
142 feet.
61 feet.
419 feet.
6. The tire load for each tire is stated:
on the tread of the tire.
on the vehicle's operator manual.
on the inside of the tire.
on the side of the tire.
7. If you must drive slowly, how should you alert following drivers?
Use your emergency flashers if it is legal
Flash your brake lights
Turn on your taillights
Help them out by signaling when it is safe to pass
8. The weight of a truck:
does not influence stopping distance.
has no impact on stopping distance.
is not as important as the vehicle's center of gravity in determining stopping distance.
None of the above.
9. You must have at least _____ inch tread depth in every major groove on front tires.
4/32
2/32
6/32
3/32
10. Which of the following is NOT a reason for hydraulic brake failure?
Loss of hydraulic pressure
Brake fade on long hills
Stab braking
All of the above.
 
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LA CDL Doubles Triples 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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