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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 Nevada doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The NV CDL doubles triples test covers the following sections of the Nevada CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this NV CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Nevada.
1. Emergency brakes are:
not required on commercial vehicles with air brakes.
not required on buses.
required on all vehicles.
not required on doubles.
2. The ABS malfunction lamp on the instrument panel is:
3. You are driving on a steep downgrade in the proper low gear. Your "safe" speed is 40 mph. When your speed reaches 40 mph, you should:
maintain your current speed, and apply the brakes when you reach 50 mph to gradually reduce your speed to 40 mph.
increase your speed to approximately 45 mph, and then apply release the brakes.
apply the brakes to gradually reduce your speed to 35 mph, and then release the brakes.
apply the brakes to quickly reduce your speed to 25 mph, and then release the brakes.
4. On dry pavement, the braking distance when travelling at 55 mph is about:
216 feet.
61 feet.
419 feet.
142 feet.
5. You can release dolly brakes:
by opening the service line valve.
by closing the emergency line valve.
by opening the air tank petcock.
by opening the air tank petcock.
6. When backing, you should:
only use mirror on the driver's side.
back quickly.
back and turn toward the right side whenever possible.
use the mirrors on both sides.
7. "Bobtail" tractors are:
tractors with two trailers.
tractors without semitrailers.
tractors with a tank.
heavily loaded trailers.
8. Placards are:
signs placed on a vehicle to identify the hazard class of the cargo.
a type of safety equipment.
devices placed below a vehicle to improve traction.
signs put inside a vehicle used to warn others of hazardous materials.
9. When the trailer breaks away or develops a bad leak, the tractor protection valve will close automatically and:
the tractor will lose all air pressure.
the trailer emergency brakes will come on.
the trailer supply valve will stay open.
the engine will shut down.
10. How does ABS help you?
ABS makes stab braking more effective.
ABS replaces your normal brakes and helps you  to stop faster.
ABS helps you avoid wheel lock up and maintain control when you brake hard on slippery surfaces.
ABS always shortens your stopping distance.
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NV 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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