North Carolina 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 three or four possible answer choices. Test questions come from the North Carolina 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.
You have made error so far
Passing grade —
4 or fewer errors
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1.
When inspecting the exhaust system for defects, which of the following should be fixed?
Missing mounting brackets or clamps
A broken exhaust pipe, muffler, or tailpipe
Leaking exhaust system parts
All of the above
2.
The parking brake should be:
Used whenever you park the vehicle.
Used while driving.
Set when driving in bad weather.
Removed.
3.
Without engine oil:
The vehicle will get the best possible gas mileage.
The engine can be destroyed quickly.
ABS will not work properly.
The windshield wipers will not operate.
4.
What happens when you push in the trailer air supply knob?
Air is supplied to the emergency lines.
The air system is disconnected from the trailer.
The drain valve is opened.
Air brakes are applied.
5.
If backing a truck:
You should rely on your mirrors to guide you.
You should first walk the area to become more familiar with obstacles.
You should look straight ahead.
6.
When changing lanes, turn signals:
Should not be used.
Should only be used if a vehicle is close to you.
Should be used each time.
7.
During the vehicle inspection test, you will be asked to:
Change a tire.
Explain to the examiner what you are inspecting and why.
Estimate the weight of a load on a trailer.
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