CDL DOUBLES PRACTICE TEST SOUTH DAKOTA
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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 South Dakota doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The SD CDL doubles triples test covers the following sections of the South Dakota CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this SD CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in South Dakota.
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1.
Which of the following statements about backing heavy vehicles is true?
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The helper should stand where you cannot see the helper.
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Back to the right side so that you can see better.
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Always back as quickly as possible.
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You should avoid backing whenever you can.
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2.
Which of the following may have reduced the clearances since the heights were posted at bridges and overpasses?
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The weight of a cargo
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Rain
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Repaving of the road
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Traffic
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3.
Off-tracking is:
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when a vehicle makes a turn and the rear wheels of the trailer end up driving in a different path than the tractor and the front wheels of the trailer.
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when a vehicle towing a trailer skids, and the trailer pushes the towing vehicle from behind until it spins the vehicle around.
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when the tires lose their contact with the road and have little or no traction.
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None of the above.
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4.
When going down a steep downgrade, you should primarily brake using:
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the parking brake.
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the service brakes.
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the emergency brake.
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the braking effect of the engine.
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5.
Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:
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the parking brake should never used to slow the vehicle.
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pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
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shifting into neutral may help slow the vehicle.
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All of the above.
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6.
The service line is also called:
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power line.
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cable line.
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brake line.
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control line.
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7.
You should do an after-trip inspection:
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after each trip.
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after each stop.
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at least once a week.
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once a month.
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8.
To know how much space you should keep in front of you:
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estimate how many vehicle lengths there are between you and the vehicle ahead.
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estimate how many seconds it would take you to reach the vehicle ahead.
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wait until the vehicle ahead of you passes a clear landmark, then count off the seconds until you reach the same spot.
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None of the above.
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9.
If you hear a loud loud "bang" and the steering feels "heavy", you should:
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check your rearview mirrors to see if you have a flat tire.
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brake hard and pull off the road.
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pump the brakes until the vehicle has slowed down.
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hold the steering wheel firmly and stay off the brake.
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10.
Air tank drains:
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are used to remove water and oil from the air tanks.
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should not be used in wet weather.
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protect the tanks and the rest of the system from too much pressure.
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are used to move air to the brakes.
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SD CDL Doubles Triples Test
| Number of questions: | 20 |
| Correct answers to pass: | 16 |
| Passing score: | 80% |
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