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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 West Virginia doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The WV CDL doubles triples test covers the following sections of the West Virginia CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this WV CDL practice test now to prepare for the actual test!
1. Which of the following statements about traveling alongside other vehicles is true?
You should avoid traveling next to other vehicles whenever possible.
You should travel next to other vehicles whenever possible.
You should never drop back or pull forward to make sure the other driver can see you.
None of the above.
2. If a vehicle is equipped with ABS, when you start the engine:
the spring brakes will come on.
the ABS indicator light on the dash should come on and then turn off.
the wheels will lock up.
the trailer emergency brakes will come on.
3. As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
a mechanical vibration.
the service line valve close.
air escaping from the open valve.
a thumping sound.
4. Air storage tanks:
are installed in the first tank the air compressor pumps air to.
hold compressed air for the brakes.
pump air into the air storage tanks.
use parts of the service brake systems to stop the vehicle in a brake system failure.
5. You can release dolly brakes:
by opening the air tank petcock.
by closing the air tank petcock.
by closing the emergency line valve.
by opening the service line valve.
6. Pre-trip inspections of doubles and triples should:
take more time than inspecting straight trucks.
be done once a week.
be done by the shipper.
take less time than inspecting straight trucks.
7. With a dual air brake system:
each system shares air tanks.
each system shares the same lines and hoses.
each system has its own air tanks, hoses and lines.
one system is the main braking system while the other is a back-up system.
8. Over-length loads:
may require special equipment such as "wide load" or flags.
require special transit permits.
require special driving care.
All of the above.
9. When driving a double or triple:
the lighter trailer should be directly behind the tractor.
all trailers should have the same weight.
the more heavily loaded trailer should be in the rear.
the more heavily loaded trailer should be directly behind the tractor.
10. When transporting cargo, cargo securement must be checked within the first _____ miles of a trip and every _____ miles after.
50; 250
100; 150
50; 150
150; 250
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WV 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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