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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.
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Passing grade —
4 or fewer errors
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1.
Don't spend too much time looking at a single mirror because:
Conditions can change quickly.
Looking at mirrors can make you drowsy.
It can result in you driving a long distance without looking at the road.
The mirror may not provide an accurate view of the road.
2.
When looking under your vehicle's hood during a pre-trip inspection, you should:
Use the parking brakes and/or chock blocks.
Leave the vehicle in a low gear.
Remove the battery.
Disconnect the radiator.
3.
Off-ramps:
Are usually safe for trucks.
Can be dangerous for trucks.
Should not be used by trucks.
Should be used only if following another vehicle.
4.
Antifreeze helps to keep an engine functioning properly:
But only in cold weather.
But only in hot weather.
Regardless of the weather.
While minimizing the vehicle's fuel use.
5.
Most heavy-duty vehicles use:
Single air brake systems.
Dual air brake systems.
Triple air brake systems.
Quadruple air brake systems.
6.
For safety purposes, when should you turn off a retarder?
When the roadways are slippery
When you are carrying a passenger
When you are carrying a heavy load
When driving in heavy traffic
7.
When transporting cargo, drivers must check the securement of the cargo every:
10 miles.
150 miles.
500 miles.
1,000 miles.
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