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
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
When inspecting the exhaust system for defects, which of the following should be fixed?
Missing mounting brackets
An orange color on the tailpipe
Exhaust system parts that do not touch fuel system parts
Exhaust system parts that do not leak
The parking brake:
Should be used whenever you park the vehicle
Should be used while driving
Should be set when driving in bad weather
Should be removed
During the vehicle inspection test to obtain a CDL, you will be asked to:
Change a tire
Explain to the examiner what you would inspect and why
Estimate the weight of a load on a trailer
If backing a truck:
You should rely on the mirrors to guide you
You should get out and walk the area to become more familiar with obstacles
You should look straight ahead
What happens when you push in the red trailer air supply knob?
It supplies air to the emergency supply lines
It disconnects the air system from the trailer
It opens the drain valve
It applies the brakes
Without engine oil:
The vehicle will get better gas mileage
The engine can be destroyed quickly
The ABS won’t work properly
The windshield wipers will not operate