SOUTH DAKOTA CDL DOUBLES TRIPLES 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 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.
To prevent rollover, you should:
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drive faster on ramps and off ramps.
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drive in the left lane whenever possible.
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drive slower around corners.
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All of the above.
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2.
Many large vehicles have convex (curved, "spot, "fisheye") mirrors. Convex mirrors:
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make things look smaller and farther away than they really are.
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misrepresent reality by showing a larger area than flat mirrors.
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are illegal in most states.
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None of the above.
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3.
Combination vehicles usually:
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are easier to drive than single than single CMVs.
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require more driving skill than single CMVs.
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are shorter than single than single CMVs.
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All of the above.
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4.
If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:
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worn.
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cracked.
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loose.
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tight.
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5.
Which of the following is not proper tie-down equipment:
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Straps
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Bungee cords
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Ropes
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Chains
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6.
Which of the following statements about retarders is NOT correct?
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Retarders help you avoid skids.
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You should turn the retarder off whenever the road is wet, icy, or snow covered.
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Retarders help slow a vehicle, reducing the need for using brakes.
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Retarders reduce reduce brake wear.
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7.
Texting while driving a CMV is:
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safer than talking on the phone.
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acceptable if the message less than 140 characters.
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prohibited.
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acceptable if the message work-related.
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8.
It may not be safe to operate at legal maximum weights:
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on highways.
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in hot weather.
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during bad weather or in mountains.
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on two-way streets.
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9.
The last trailer of triples is ______ as likely to turn over as a five-axle tractor.
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3.5 times
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4 times
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5 times
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twice
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10.
You are driving a heavy vehicle with a manual transmission, and you have to stop on the shoulder while driving on an uphill grade. When putting your vehicle back in motion up the grade, you should:
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shift down to a speed that you can control without using the brakes.
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keep the clutch slipping while slowly accelerating.
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partly engage the clutch before you take your right foot off the brake.
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use the parking brake to hold the vehicle until the clutch engages.
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Doubles Triples SD CDL Test
| Number of questions: | 20 |
| Correct answers to pass: | 16 |
| Passing score: | 80% |
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