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SOUTH DAKOTA DOUBLES TRIPLES PRACTICE CDL 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.
1. Most heavy-duty vehicles use:
pressure brakes.
hydraulic brakes.
air brakes.
solid brakes.
2. How can you tell if a converter dollie has ABS?
There is a yellow lamp on the left side of the dolly.
There is an ABS system on the right side of the dolly.
There is an ABS plaque on the right side of the dolly.
There is a red lamp on the left side of the dolly.
3. When driving a double or triple:
all trailers should have the same weight.
the more heavily loaded trailer should be directly behind the tractor.
the lighter trailer should be directly behind the tractor.
the more heavily loaded trailer should be in the rear.
4. When backing, it is best to:
try to back in the direction of the drift.
use a helper whenever possible.
use only the passenger's side mirror.
back toward the passenger's side when possible.
5. When driving, you should check mirrors regularly to know where other vehicles are around you. Remember that:
convex mirrors make things look larger and closer than they really are.
you should check your after the start of any trip to make sure they are properly adjusted.
every registered motor vehicle must have at least one mirror.
there are blind spots that your mirrors cannot show you.
6. Weight that is loaded so there is a high center of gravity:
reduces the chance that the load will shift to the side or fall off.
causes greater chance of rollover.
makes a vehicle easier to handle.
All of the above.
7. If your vehicle is hydroplaning, you should:
speed up.
put the vehicle in reverse.
apply the brakes.
stay off the brake.
8. If the drive wheels start to skid:
use the brakes to slow down.
push in the clutch to let them turn freely.
accelerate slightly to regain control.
All of the above.
9. Hanging meat in a refrigerated truck can be:
a very unstable load with a low center of gravity.
a very stable load if properly distributed.
a very unstable load with a high center of gravity.
a very stable load with a low center of gravity.
10. The posted speed limit for a curve:
is safe for trucks or buses, but it may be too fast for cars.
may be too fast for many trucks or buses.
is safe for all vehicles.
is optional and may be exceeded.
 
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SD Doubles Triples CDL Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
Number of questions: 20
Correct answers to pass:16
Passing score:80%
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