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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Florida 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 Florida CDL Manual. Take this practice test now to prepare for the actual FL CDL combination test!
1. Before entering an intersection, make sure that:
accelerate smoothly and change gears as necessary.
there is sufficient space to clear it.
That there is enough room for the rear of your vehicle to clear the stop line on your side.
there's enough room to get at least halfway across.
2. If your vehicle is equipped with air brakes, loss of air pressure in the emergency line causes:
the trailer spring brakes to come on.
the speed of your vehicle to increase.
the trailer emergency brakes to come on.
All of the above.
3. Before connecting the converter dolly to the rear trailer, make sure that:
the trailer height is slightly lower than the center of the fifth-wheel.
the shut-off valves at the rear of the first trailer are open.
the locking jaws rest on the kingpin.
the kingpin rests on the fifth-wheel.
4. How do you find out how many seconds of following distance you have?
Wait until the vehicle ahead of you passes a pavement marking, shadow or landmark. Then count off the seconds until you reach the same spot.
Wait until the vehicle ahead of you passes a pavement marking or some other clear landmark, then use the stopwatch on your mobile phone to see how long it takes you to reach the same spot.
Pass a stationary object and count how many seconds it takes the vehicle ahead of you to reach the same spot.
None of the above.
5. Which of the following may have reduced the clearances since the heights were posted at bridges and overpasses?
Repaving of the road
The weight of a cargo
6. Which of the following is NOT part of testing the tractor protection valve?
Pulling forward slowly, then applying the trailer brakes.
Charging the trailer air brake system.
Shutting off the engine.
Stepping on and off the brake pedal several times to reduce the air pressure in the tanks.
7. Emergency lines on combination vehicles are often coded with the color ____ to keep from getting them mixed up with the ____ service line.
red; yellow
blue; red
red; blue
yellow; black
8. You should not use the trailer hand brake to straighten out a jackknifing trailer. Why?
You should use the service break instead.
The brakes on the trailer wheels caused the skid in the first place.
You should use the emergency break instead.
The brakes on the trailer wheels will not respond.
9. The service line:
carries power steering fluid to control the trailer brakes.
carries air to the parking brake to control the trailer brakes.
carries air and is connected to relay valves which allow the trailer brakes to be applied more quickly.
None of the above.
10. When backing a truck you should:
get out and walk around the vehicle before you begin to back.
look straight ahead.
back and turn toward the right side.
always rely on your mirrors.
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FL CDL Combination Test

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