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Nebraska 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 two, three or four possible answer choices. Test questions come from the Nebraska 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
Front brake limiting valves were intended to:
Prevent the front tires from skidding.
Prevent the front tires from overheating.
Create equal brake usage.
Remove uncertainty when applying the brakes.
Which of the following types of vehicles is most prone to the “crack-the-whip" effect?
An automobile
A three-axle tractor
A bobtail tractor
A triple combination
What is a concern immediately after it begins raining?
The water will mix with grease and oil on the road, making the roadway slippery.
A driver may forget where the windshield wiper lever is located.
It may stop raining.
People will be using their windshield wipers needlessly.
To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:
Set the control to normal.
Set the control to the off position.
Set the control to neutral.
Keep the control at the halfway mark.
Talking on a hands-free phone while driving:
Does not distract the driver.
Only distracts the driver if the driver is speaking.
Can be distracting to the driver.
If you don't pull a dolly out from beneath the rear trailer before unlocking the pintle hook:
The tow bar may fly up.
The kingpin may break.
The brakes may become unlocked.
While inspecting coupling equipment before a trip, the air lines should not:
Be connected to the glad hands.
Have any slack.
Be secured.
Be leaking.
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