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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. When coupling, you should:
make sure the sliding fifth-wheel is locked.
make sure the trailer kingpin is bent.
be aware that wrong coupling and uncoupling can be very dangerous.
make sure the trailer wheels are not chocked.
2. When going down grades, you should:
rely solely on engine braking to reduce your speed.
put the transmission in Neutral.
downshift to a lower gear.
shift up.
3. Glad hands are:
securement devices.
coupling devices.
warning devices.
electronic devices.
4. Axle weight is:
the value specified by the manufacturer as the loaded weight of one axle.
the weight transmitted to the ground by one axle or one set of axles.
the maximum safe weight your tires can carry at a specified pressure.
the weight of all the axles added together.
5. If you must drive slowly, how should you alert following drivers?
Flash your brake lights
Help them out by signaling when it is safe to pass
Turn on your taillights
Use your emergency flashers if it is legal
6. Emergency lines on combination vehicles are often coded with the color ____ to keep from getting them mixed up with the ____ service line.
yellow; black
blue; red
red; yellow
red; blue
7. When parking, you should choose a spot:
that allows you to pull forward when you leave.
that allows you do a walk around inspection.
that requires backing up.
All of the above.
8. Cargo should be properly covered:
to protect people from spilled cargo.
to block your view or someone else’s.
to protect the weather from the cargo.
All of the above.
9. A high center of gravity means:
a rollover is less likely.
you are more likely to tip over.
you'll have better traction.
the spring brakes will come fully on.
10. When inspecting the coupling, make sure the fifth-wheel jaws have closed around the:
the electrical cord.
the brake camshaft.
head of the kingpin.
shank of the kingpin.
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SD CDL Combination Test

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