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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 Missouri doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The MO CDL doubles triples test covers the following sections of the Missouri CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this MO CDL practice test now to prepare for the actual test!
1.
Your vehicle has air brakes. To stop, you should:
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pull the parking brake control knob out.
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release the accelerator, push in the clutch, and shift to Neutral at the same time.
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push the brake pedal down.
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2.
On any upgrade, gravity:
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doubles your speed.
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speed you up.
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slows you down.
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3.
Doubles and triples:
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can be stopped suddenly due to their weight.
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can be turned suddently due to the low center of gravity.
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can't be turned suddenly.
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4.
Having ABS on only the trailer:
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makes the trailer more likely to swing out.
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still gives you more control over your vehicle during braking.
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is very dangerous.
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5.
What factors can cause brakes to fade?
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Excessive heat and brakes out of adjustment.
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Dirt roads and in unpaved yards.
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Slippery surfaces and shaded areas.
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6.
If the drive wheels start to skid:
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use the brakes to slow down.
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push in the clutch to let them turn freely.
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accelerate slightly to regain control.
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7.
When driving at night, you should use ________ when you can.
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low beams
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high beams
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emergency flashers
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8.
Which of these statements about brakes is true?
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Brake fade does not result from excessive heat.
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The lighter the vehicle, the more heat the brakes absorb to stop it.
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None of the above.
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9.
Your vehicle should be equipped with all of the following except:
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Instructions
on how to perform a vehicle inspection test
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Warning devices for parked vehicles
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Spare electrical fuses
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10.
With an engine fire, you should NOT:
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turn the engine off as soon as possible.
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shoot foam from the vehicle’s underside.
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open the hood.
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