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Idaho 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 possible answer choices. Test questions come from the Idaho Commercial Driver’s License Manual. Questions come from chapters covering: Driving Safely, Transporting Cargo 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.
If a trailer begins to skid, it is best for the driver to:
Release the brakes.
Accelerate.
Quickly turn the steering wheel in one direction, then in the other.
2.
Alcohol can be removed from your system:
By exercising.
By drinking coffee.
By waiting.
3.
If a vehicle's Anti-Lock Braking System (ABS) is malfunctioning:
The vehicle will have no brakes.
The vehicle will still be able to brake.
The vehicle will likely travel faster than usual.
4.
If the emergency air line loses pressure:
The service brakes will activate.
The tractor protection valve will close.
The rear trailer will detach from the combination.
5.
Alcohol evaporators are:
Illegal.
Used to add alcohol to braking systems to prevent items from freezing.
Only allowed on vehicles carrying hazardous materials.
6.
Rust around wheel nuts may mean:
It rained recently.
The nuts are loose.
The nuts are too tight.
7.
If there is ice on the front of your side mirror:
You should exit the roadway.
You can expect ice to be on the roadway.
There will not be ice on the roadway.
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