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Colorado 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 Colorado 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 a vehicle is started, warning lights and buzzers:
Should stay on for several minutes.
Should turn off within a few seconds.
Should stay on until manually turned off.
Should not come on.
2.
If the brakes “pull” to one side or the other when you use them, it's a sign that:
The brakes are working properly.
The brakes need to be checked.
The brakes are new.
The brakes have too much stopping power.
3.
Which of the following is not a part of an air brake system?
A service brake system
A parking brake system
An emergency brake system
An axle brake system
4.
If braking at a speed of 55 mph while driving on dry pavement, the brake lag can add ____ to your vehicle's total stopping distance.
32 feet
15 feet
50 feet
10 feet
5.
Trailers manufactured after ____ must be equipped with Anti-Lock Braking Systems (ABS).
1943
1998
2009
2015
6.
When driving a double or triple, it is important to remember that:
The vehicle requires more space than most other vehicles.
Other drivers will likely get out of your way when necessary.
The vehicle likely weighs the same as other vehicles.
The vehicle can easily fit into small spaces.
7.
The ____ tells a driver how much pressure is in the air tanks.
Application pressure gauge
Air compressor governor
Supply pressure gauge
Drum brake
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