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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Utah 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 Utah CDL Manual. Take this practice test now to prepare for the actual UT CDL combination test!
1. Which of these statements about brakes is true?
To stop, the brake shoes and linings are pushed against the outside of the drum.
Brake fade does not result from excessive heat.
The lighter the vehicle, the more heat the brakes absorb to stop it.
None of the above.
2. To be in the proper position for coupling, the fifth wheel should:
have its jaws closed around the shank of the kingpin.
be tilted down towards the rear of the tractor.
tilted up towards the rear of the tractor.
be level with the ground.
3. If during vehicle inspection a tire is too hot to touch, you should:
make sure there is enough engine oil on the tires.
let air out.
immediately decrease air pressure.
remain stopped until the tire cools off.
4. The service line is also called:
control line or signal line.
signal line or air line.
carrier line or control line.
pressure line or signal line.
5. What can cause poor traction?
Too much weight on the steering axle.
Too little weight on the driving axles.
Overloading the truck.
All of the above.
6. The tractor protection valve:
keeps air in the tractor brake system should the trailer break away or develop a bad leak.
works the trailer brakes.
controls the emergency brakes on combination vehicles.
supplies air to the trailer air tanks.
7. When the tractor protection valve closes, the trailer _______ brakes will come on.
8. The person watching the loading or unloading of a cargo tank must be within _______ of the tank.
50 feet
5 feet
15 feet
25 feet
9. When backing a truck you should:
look straight ahead.
get out and walk around the vehicle before you begin to back.
always rely on your mirrors.
back and turn toward the right side.
10. To stop a trailer skid, you should:
use the brakes to slow down.
use the trailer hand brake to straighten out the rig.
countersteer to get traction back.
release the brakes to get traction back.
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UT CDL Combination Test

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