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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Kansas doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The KS CDL doubles triples test covers the following sections of the Kansas CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this KS CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Kansas.
1. Emergency brakes are:
not required on doubles.
not required on buses.
not required on commercial vehicles with air brakes.
required on all vehicles.
2. When checking the engine compartment in a vehicle inspection, you should check all of the following except:
Coolant level in radiator
Engine oil level
Shock absorbers
Windshield washer fluid level
3. Air storage tanks:
are installed in the first tank the air compressor pumps air to.
hold compressed air for the brakes.
use parts of the service brake systems to stop the vehicle in a brake system failure.
pump air into the air storage tanks.
4. Which of the following statements about retarders is NOT correct?
You should turn the retarder off whenever the road is wet, icy, or snow covered.
Retarders reduce reduce brake wear.
Retarders help slow a vehicle, reducing the need for using brakes.
Retarders help you avoid skids.
5. In a combination vehicle, ________ is most likely to turn over.
the last trailer
the trailer behind the tractor
the tractor
All of the above.
6. How can you tell if a converter dollie has ABS?
There is an ABS plaque on the right side of the dolly.
There is a red lamp on the left side of the dolly.
There is an ABS system on the right side of the dolly.
There is a yellow lamp on the left side of the dolly.
7. If your vehicle is equipped with air brakes, loss of air pressure in the emergency line will cause:
the springs to put on the brakes.
the trailer emergency brakes to come on.
the trailer supply valve to open.
the vehicle to slide back and forth.
8. When coupling a double or triple, ________ should be attached last.
the middle trailer.
the more heavily loaded trailer.
the trailer right behind the cab.
None of the above.
9. If you experience a loss of hydraulic pressure, you should do all of the following except:
Use the parking brake
Put the transmission in Neutral
Pump the brakes
10. If you are feeling sleepy, you should:
increase your speed to get to the destination quicker.
pull off the road and rest or take a nap.
slow down and drive on the shoulder of the road.
None of the above.
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KS CDL Doubles Triples 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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