CDL Doubles/Triples Test (2024) - FREE MO CDL Practice Test

1. Your vehicle has air brakes. To stop, you should:

pull the parking brake control knob out.
release the accelerator, push in the clutch, and shift to Neutral at the same time.
push the brake pedal down.

2. On any upgrade, gravity:

3. Doubles and triples:

can be stopped suddenly due to their weight.
can be turned suddently due to the low center of gravity.
can't be turned suddenly.

4. Having ABS on only the trailer:

makes the trailer more likely to swing out.
still gives you more control over your vehicle during braking.
is very dangerous.

5. What factors can cause brakes to fade?

Excessive heat and brakes out of adjustment.
Dirt roads and in unpaved yards.
Slippery surfaces and shaded areas.

6. If the drive wheels start to skid:

use the brakes to slow down.
push in the clutch to let them turn freely.
accelerate slightly to regain control.

7. When driving at night, you should use ________ when you can.

8. Which of these statements about brakes is true?

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.

9. Your vehicle should be equipped with all of the following except:

Instructions on how to perform a vehicle inspection test
Warning devices for parked vehicles
Spare electrical fuses

10. With an engine fire, you should NOT:

turn the engine off as soon as possible.
shoot foam from the vehicle’s underside.
open the hood.

CDL DOUBLES PRACTICE TEST MISSOURI