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Relay valves.
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Supply line.
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Emergency air line.
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Steering wheel.
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Texas CDL Permit Test - Double
(From the 2021 Texas CDL driver handbook)
| 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. Each question has four answer choices. To pass, the applicant must answer at least 16 questions correctly. Test questions come from the Texas Commercial Motor Vehicle Drivers Handbook. 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.
Passing grade —
4 or fewer errors
advertising
1.
The service air line is attached to the:
2.
When a combination vehicle goes around a corner:
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The turn should be made as tightly as possible.
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The front and rear wheels move in different paths.
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The rear wheels should run over the curb.
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It is acceptable for street signs to be knocked over if they are too close to the road.
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3.
If you don't pull the dolly out from beneath the rear trailer before unlocking the pintle hook:
|
The tow bar may cause injury.
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The landing gear may break.
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The pintle hook may detach.
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Nothing bad could happen.
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4.
When turning quickly to avoid an object in the roadway, you should:
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Apply your brakes as you steer.
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Give yourself extra clearance by turning more than needed to miss the object.
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Turn just enough to miss the object and avoid turning more.
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Steer and accelerate at the same time.
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5.
Before starting down a hill, be sure to:
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Accelerate.
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Switch into a high gear.
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Sound your horn.
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Switch into a low gear.
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6.
What can happen if a parking brake is used in very wet weather when temperatures are below freezing?
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The brakes will squeak.
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The brakes may freeze so the vehicle cannot move.
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The brakes may suddenly release by themselves.
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The brakes may explode.
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7.
Most drivers are the least alert:
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In the morning.
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In cold weather.
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At night.
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After work.
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