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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. To avoid rollbacks when you start, you should:
put on the parking brake whenever necessary.
release the parking brake only when you have applied enough engine power.
if you have manual transmission, partly engage the clutch before you take your right foot off the brake.
All of the above.
2. When inspecting the cargo, make sure it is:
piled up.
not overloaded.
secured properly for the first 50 miles after beginning a trip.
All of the above.
3. If your truck has automatic transmission, you should downshift:
whenever road conditions allow.
when you need to accelerate.
after entering a curve.
when going down grades.
4. What is the minimum tread depth for tires other than front tires?
4/16 inch
8/32 inch
4/32 inch
2/32 inch
5. When you drive a tractor-trailer combination with ABS, you should:
pump the brakes.
always apply the brakes hard.
brake as you always have.
apply the trailer hand brake whe braking.
6. If a load is 50 feet long, the minimum number of tie-downs required is:
7. You should use chocks when parking a trailer without spring brakes because:
the brakes will hold only as long as there is air pressure in the trailer air tank.
it is required by law.
it helpsĀ prevent brake failure.
it helpsĀ prevent skids.
8. To avoid rollovers, you should drive slowly:
around corners.
on ramps.
off ramps.
All of the above.
9. When more cargo is piled up in a truck, the truck becomes easier to turn over. Fully loaded rigs are _________ to roll over in a crash than empty rigs.
three times more likely
five times more likely
ten times more likely
less likely
10. If you unlock the pintle hook with the dolly still under the rear trailer:
the dolly tow bar may fly up.
the brakes could be damaged by the combined forces of the springs and the air pressure.
your vehicle might roll away.
steam and boiling water can spray under pressure.
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SD Combination Test

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