CDL General Knowledge Test 12 – Classic Mode

This is CDL General Knowledge Test 12 in our original Classic Mode. Simply click in your answer to each CDL practice test question. When you're finished, check your score and results. You can reset the test and retake it as needed.


Start Test #12 Now

1. Which of the following are causes of vehicle fires...

A Spilled fuel
B Short circuits
C Driver smoking
D All of the above

2. Hydroplaning can occur when you drive through water or slush. If you experience hydroplaning you should...

A Lightly tap your brakes to slow down
B Release the accelerator and push in the clutch
C Steer hard to the right
D Speed up to get through the water quickly

3. An engine retarder (Jake Brake) is designed to...

A Use engine power to slow down the vehicle
B Apply braking power to the steering wheel
C Work only with manual transmissions
D Work when you accelerate

4. The best way to put out a fire is to...

A Get as close as possible and spray the flames
B Stand downwind and spray the flames
C Stand upwind and spray the base of the fire
D Stop spraying as soon as the flames disappear

5. A front wheel skid is usually caused by...

A Driving too fast for conditions
B Lack of tread on the front tires
C Cargo improperly loaded
D All of the above

6. If you're required to keep a log of your time...

A you may bring it up to date once a week
B any FHWA agent may inspect it
C you may assign your co-driver to fill it out and sign it for you
D you should add an hour when you cross a time zone

7. If your vehicle doesn't pass a roadside inspection...

A it can be declared "out of service"
B you cannot drive the vehicle, even to a repair station
C you may repair it on the spot, then resume your trip
D all of the above

8. By law, you must have your vehicle's lights on...

A one half hour after sunset until one half hour before sunrise
B unless street lights are lit
C only when there's not enough natural light to see clearly
D none of the above

9. Normal oil pressure while idling is...

A 165 to 185 degrees Fahrenheit
B 30 to 75 psi
C 30 to 35 psi
D 5 to 15 psi

10. Progressive shifting means...

A downshifting at lower rpm as you reach the lower gears
B downshifting at higher rpm as you reach the lower gears
C upshifting at lower rpm as you reach the higher gears
D upshifting at higher rpm as you reach the highest gears

End of Test #12

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