DE CDL DOUBLES TRIPLES TEST - PRACTICE TEST
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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Delaware doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The DE CDL doubles triples test covers the following sections of the Delaware CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this DE CDL practice test now to prepare for the actual test!
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1.
Right after it starts to rain, the road is very slippery. Why?
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Because the water mixes with oil left on the road by vehicles.
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Because black ice may form on the road.
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Because rain is very slippery.
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None of the above.
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2.
The heavier the vehicle:
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the less work the brakes must do to stop it.
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the higher the center of gravity will be.
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the more work the brakes must do to stop it.
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None of the above.
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3.
Which of the following may have reduced the clearances since the heights were posted at bridges and overpasses?
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Repaving of the road
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Traffic
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Rain
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The weight of a cargo
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4.
Excessive use of the service brakes results in overheating. Too much heat can:
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make the brakes stop working.
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cause the brakes to squeak.
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cause the brakes apply unevenly.
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cause the brakes to grab.
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5.
Alcohol:
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does not affect judgement.
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improves reaction time.
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improves muscle coordination.
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impairs depth perception.
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6.
Which of these describes the proper braking technique when driving on a long and steep downgrade?
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Apply the brakes until your speed has been reduced to 5 mph, then release the brakes. When your speed has increased to your safe speed, repeat the previous steps.
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Release the brakes until your speed is 5 mph above your safe speed, then apply the brakes. When your speed has decreased to your safe speed, repeat the previous steps.
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Apply the brakes. When your speed has been reduced to 5 mph below your safe speed, release the brakes. When your speed has increased to your safe speed, repeat the previous steps.
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All of the above.
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7.
When you double your speed, the braking distance is:
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3 times longer.
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2 times longer.
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the same.
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4 times longer.
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8.
When you turn suddenly while pulling doubles, which trailer is most likely to turn over?
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The rear trailer is twice as likely to turn over as the tractor.
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All trailers are equally likely to turn over.
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The front trailer is twice as likely to turn over as the tractor.
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None of the above.
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9.
It's very important to distribute the cargo so it is:
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in the centre of the load.
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as high up as possible.
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as low as possible.
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piled up.
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10.
If the drive wheels start to skid:
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accelerate slightly to regain control.
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push in the clutch to let them turn freely.
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use the brakes to slow down.
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All of the above.
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DE Doubles Triples Test
| Number of questions: | 20 |
| Correct answers to pass: | 16 |
| Passing score: | 80% |
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