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District Of Columbia CDL Permit Test - Double

Number of questions: 20
Passing score: 16
Directions: This endorsement is required if the driver will pull two or three trailers. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice questions. To pass, the applicant must answer at least 16 questions correctly. Each question has four possible answer choices. Test questions come from the Washington D.C. Commercial Driver License Manual. Questions come from chapters covering: Driving Safely, Air Brakes (if applicable), Combination Vehicles and Doubles and Triples. The Double/Triple endorsement can be used with the Class A CDL.
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4 or fewer errors
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1.
When inspecting a double or triple trailer that has more parts than a smaller tractor-trailer combination:
To save time, not all parts need to be inspected.
A driver should only inspect the first trailer and its parts.
A driver should only inspect the rear trailer and its parts.
A driver should inspect all parts to ensure safety.
2.
Which of the following types of vehicles is most prone to the “crack-the-whip" effect?
An automobile
A three-axle tractor
A bobtail tractor
A triple combination
3.
What is sleep debt?
When you fall behind on sleep
When you want to take a nap
Excess sleep
The amount of time it takes to get ready to drive after sleeping
4.
If involved in a crash, basic procedures should include all of the following, except:
Protecting the area.
Notifying the proper authorities.
Caring for the injured.
Driving away without stopping.
5.
A danger of a large truck swerving to avoid a hazard is:
The truck may miss the object.
The truck may flip over.
The truck may stay in the same lane.
Other vehicles may do the same thing.
6.
____ are the cause of more than half of all accident-related truck driver deaths.
Truck rollovers
Motorcycles
Slippery roads
Pedestrians
7.
If you are turning left and there are two available left turn lanes, which lane should you choose?
The left lane
The right lane
Either lane
Trucks should not turn where there are two left turn lanes.
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