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Drivers who want to drive combination vehicles must pass the combination vehicles test. The South Dakota CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the South Dakota CDL Manual. Take this practice test now to prepare for the actual SD CDL combination test!
1. One way to prevent hydroplaning is to:
take curves at higher speeds.
make sure you have enough tread on your tires.
have less than 4/32 inch tread depth in every major groove on front tires.
use the controlled braking method.
2. When should you use chocks to park a trailer without spring brakes?
Only when parking downhill
Only when parking uphill
3. 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:
keep the clutch slipping while slowly accelerating.
shift down to a speed that you can control without using the brakes.
use the parking brake to hold the vehicle until the clutch engages.
partly engage the clutch before you take your right foot off the brake.
4. When you park trailers without spring brakes, you should use wheel chocks:
to prevent air from escaping.
to keep the trailer from moving.
to prevent the transmission from shifting up.
to prevent overheating.
5. The service line is also called:
control line or signal line.
pressure line or signal line.
carrier line or control line.
signal line or air line.
6. Radial and bias-ply tires:
should be used together.
should be used together only when driving in packed snow.
should not be used together.
should be used together only during bad weather.
7. During a trip you need to inspect the cargo and its securing devices:
within the first 50 miles after beginning a trip.
after every break you take.
every 3 hours or 150 miles.
All of the above.
8. Which of the following is NOT a way to determine if your trailer is equipped with ABS (antilock braking system)?
Wheel speed sensor wires are coming from the back of the brakes.
It was built after March 1, 1998.
It has yellow ABS malfunction lamps.
The letters "ABS" are printed on the side of the steering wheel.
9. If you're feeling tired while driving you should:
eat something.
drink coffee.
increase your speed to get to your destination quicker.
stop driving and get some rest.
10. If you cannot make a right turn without entering another traffic lane, you should:
turn wide as you complete the turn.
watch out for vehicles coming toward you and back up for them.
swing wide to the left before starting the turn.
turn wide before you start the turn.
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SD CDL Combination 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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