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The service brakes to activate.
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The tractor protection valve to close.
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The rear trailer to detach from the combination.
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The suspension springs to extend.
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Pennsylvania CDL Permit Test - Double
(From the 2021 Pennsylvania 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. To pass, the applicant must answer at least 16 questions correctly. Test questions come from the Commonwealth of Pennsylvania Commercial Driver’s Manual. Questions come from chapter covering: Doubles and Triples. The Double/Triple endorsement can be used with the Class A CDL.
Passing grade —
4 or fewer errors
advertising
1.
A loss of air pressure in the emergency line will cause:
2.
To confirm that a trailer has ABS, you can:
|
Look under the trailer for wheel speed sensors coming from the back of the brakes.
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Look under the hood for the ABS sticker.
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Look at the tires.
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Remove a tire and look for the ABS sensor on the axle.
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3.
When approaching a railroad crossing, you should:
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Increase your speed to get across the tracks as quickly as possible.
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Roll your window down to listen for a train.
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Rely on traffic control signals.
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Never try to outdrive an approaching train.
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4.
Which of the following surfaces provides the least amount of traction?
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Ice that is dry
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Ice that is wet
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Wet pavement
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Dry pavement
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5.
Before entering a curve, you should:
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Upshift.
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Speed up.
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Drive on the shoulder.
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Downshift.
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6.
Why are roads especially slippery right after it begins to rain?
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The water mixes with oil and grease on the road.
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Roads are naturally slippery.
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Gravel often gets washed to the middle of the lane.
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Tires are not usually designed to drive in rain.
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7.
A converter dolly that has ABS can be identified:
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By a blue sticker.
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By an orange sticker.
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By a yellow lamp on the left side of the dolly.
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|
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By a blue lamp on the left side of the trailer.
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