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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 Illinois doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The IL CDL doubles triples test covers the following sections of the Illinois CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this IL CDL practice test now to prepare for the actual test!
1.
When making a turn you should:
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honk your horn.
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turn the signal off before entering the turn.
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make gestures to get the attention of other drivers.
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signal early.
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2.
If you become drowsy while driving, you should:
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drink plenty of coffee.
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take a break.
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open the windows to get some fresh air.
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try to fight it.
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3.
Containerized loads are used:
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when transporting liquids.
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when transporting explosives.
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when the cargo exceeds the weight limit.
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when the cargo has been or will be carried by rail or ship.
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4.
The parking brake:
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should be used whenever you park.
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should be used when you need to apply the brakes firmly.
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should be used when driving in bad weather.
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All of the above.
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5.
After an accident, an improper use of flares could cause:
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air pressure to build from 50 to 100 psi within 2 minutes.
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a fire if spilled fuel is on the ground.
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the springs to put on the brakes.
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the vehicle to slide back and forth.
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6.
You have two tie-downs on a 15 foot load. How many more tie-downs do you need to secure cargo and keep it from shifting or falling?
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Two
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None
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One
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Three
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7.
When inspecting the coupling, make sure the fifth-wheel jaws have closed around the:
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the brake camshaft.
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the electrical cord.
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head of the kingpin.
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shank of the kingpin.
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8.
An alcohol evaporator:
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used to reduce the chance of the front wheels skidding.
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to hold compressed air.
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is used to reduce the risk of ice in air brake valves and other parts during cold weather.
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protects the air brake system from too much pressure.
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9.
If a load is 50 feet long, the minimum number of tie-downs required is:
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10
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4
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5
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3
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10.
When possible, you should park:
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on the roadway.
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on the shoulder.
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so you will have to back up when you leave.
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so you will be able to pull forward when you leave.
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