CDL Permit Quiz

General Knowledge 5 CDL Test Alabama
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1. When driving through work zones, you should:
  • Reduce your speed only if workers are close to the roadway.

  • Turn on your parking lights.

  • Watch for sharp pavement drop-offs.

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2. Which of these statements about engine overheating is true?
  • You should never shut off an overheated engine until it cools.

  • You should never remove the radiator cap on a pressurized system until the system is cooled.

  • Antifreeze is not needed when the weather is warm.

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3. Which vehicle will have the most difficulty staying in its lane during strong winds?
  • A double with an empty trailers.

  • A tractor pulling a loaded flatbed trailer.

  • A triple axle vehicle with cargo.

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4. Where or how is cargo blocking used?
  • In the front, back, and/or sides of the cargo.

  • From the upper part of the cargo to the floor.

  • Loosely around the cargo.

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5. Placards must be:
  • Displayed on all vehicles hauling any amount of hazardous materials.

  • Placed only on the front and rear of a vehicle.

  • Placed on all four sides of a vehicle.

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6. Stab braking should not be used on vehicle with:
  • Trailers.

  • Hazardous materials.

  • Anti-lock brakes.

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7. Which may be a sign of tire failure?
  • Wheels skidding.

  • A loud hissing noise.

  • Vibration.

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8. The purpose of the retarders is to:
  • Help slow the vehicle while driving and reduce brake wear.

  • Apply extra braking power to the non-drive axles.

  • Help prevent skids.

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9. Hydroplaning:
  • Only occurs when there is a lot of water.

  • Cannot occur when driving through a puddle.

  • Is more likely if tire pressure is low.

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10. You are driving a vehicle at 55 mph on dry pavement. About how much total stopping distance will you need to bring it to a stop?
  • Twice the length of the vehicle.

  • Half the length of a football field.

  • The length of a football field.

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11. You do NOT have a Hazardous Materials Endorsement on your Commercial Driver's License. You can drive a vehicle hauling hazardous materials when:
  • The vehicle does not required placards.

  • A person who has the Hazardous Materials Endorsement rides with you.

  • The GVWR is 26,001 pounds or less.

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12. When it is necessary to learn how a fire extinguisher works?
  • Before a fire happens.

  • Only when a fire happens.

  • Only when you are transporting flammable materials.

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13. An antilock braking system is:
  • Used to compensate for poor brakes.

  • An addition to your normal brakes.

  • An integral part of the vehicle's braking system.

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14. If you are not sure what to use to put out the hazardous material fire, you should:
  • Wait for qualified firefighters.

  • Use water.

  • Use dirt.

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15. Medicine used to treat the common cold:
  • Should only be used when driving at daytime.

  • Often makes you sleepy and thus should not be used while driving.

  • Can still be used while driving if you only take half the regular dosage.

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16. You feel tired during long trip. To stay alert you should:
  • Take an over-the-counter stimulant.

  • Stop periodically for rest and exercise.

  • Keep the vehicle closed and heated.

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17. Which of these is true about commercial vehicle habit of swinging wide on turns?
  • Off-tracking.

  • Wide-rounding.

  • Sidewinding.

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18. If your vehicle gets stuck on a raised railroad- highway crossing, you should:
  • Use reverse gear to back up off the crossing.

  • Get out the vehicle and away from the tracks.

  • Turn off all your lights.

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19. What is the most important reason to inspect your truck or bus?
  • Safety.

  • To avoid being cited.

  • It's the law.

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20. Over-weight or over-sized loads:
  • Can only be driven in daylight.

  • Require a special transit permit.

  • Must be escorted by police.

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21. During an inspection of hydraulic brakes, you should pump the brake pedal three times then apply firm pressure to the pedal for five seconds. If the brakes are working properly, the pedal should:
  • Depress slightly.

  • Sink to the floor.

  • Not move.

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22. What should you do if you are unsure whether you have enough overhead clearance?
  • Slow down slightly and try to drive under the object.

  • Find another route that will not require driving under the object.

  • Estimate the height of an overhead object if it is not posted.

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23. A car suddenly cuts in front of you, creating a hazard. Which of these actions should you NOT take?
  • Honk your horn and stay close behind the car.

  • Signal and change lanes to avoid hazard.

  • Slow down to prevent a crash.

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24. What should you do when your vehicle hydroplanes?
  • Start stab braking.

  • Release accelerator.

  • Accelerate slightly.

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25. Which of these is true about mirror adjustment?
  • You should adjust your mirrors before starting the trip.

  • You can adjust your mirrors while you are driving.

  • The mirrors could be adjusted correctly even if the trailer is not straight.

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26. Which of these is a danger of crossing railroad tracks on dirt roads?
  • The ground underneath the tracks may not be stable.

  • You could get hung up halfway across the tracks.

  • Your tires could sink into the dirt and not cross the trucks.

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27. Which of these is usually true about driving in tunnels?
  • Headlights are required by law.

  • There may be crosswinds when exiting.

  • Speeds are limited to 30 mph. or less.

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28. When approaching a bridge on a two-lane road, you should:
  • Drive in the center of the bridge.

  • Check the weight limit of the bridge.

  • Slow down to 25 mph on the bridge.

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29. Which of these pieces of emergency equipment should always be carried in your vehicle?
  • Circuit breakers.

  • First aid kit.

  • Warning devices for parking vehicle.

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30. If you must stop into the oncoming lane as you make a turn, you should:
  • Watch for an oncoming traffic.

  • Complete your turn without stopping.

  • Back up to allow the oncoming traffic to pass.

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31. Whenever you double your speed, your vehicle has about ______ times of destructive power if it crashes?
  • two

  • three

  • four

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32. You are required to inspect your truck within how many miles after beginning the trip?
  • 100.

  • 150.

  • 50.

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33. Which of these is good thing to remember about using mirrors?
  • You should look at a mirror for several seconds at a time.

  • Convex mirrors make things look larger and closer than they really are.

  • There are blind spots that your mirror cannot show.

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34. The tread depth on a front steering wheels tires should be:
  • Not less than 4/32 (four thirty two) inch.

  • More than 6/32 (six thirty two) inch.

  • Not less than 2/32 (two thirty two)inch.

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35. When a helper should be used to help back your vehicle?
  • Only when you need to back on a curved path.

  • Whenever you have to back.

  • Only when you have a trailer on your vehicle.

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36. Which of these statements about tires is true?
  • You should inspect your tires every two hours or every 100 miles when driving in very hot weather.

  • The air pressure of a tire decreases as the temperature of the tire increases.

  • If tires are too hot to touch, let 5-10 pounds of air pressure out to cool them down.

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37. What is the proper way to hold a steering wheel?
  • With both hands close together, near the top of the wheel.

  • With both hands close together, near the bottom of the wheel.

  • With both hands, on the opposite sides of the wheel.

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38. Which of these is the proper way to signal to change lane?
  • Signal early, and change lanes slowly and smoothly.

  • Signal just as you begin to change lines, and move quickly.

  • Signal after you begin change and cross over slowly.

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39. hot weather?
  • It becomes gummy, making tires stick road.

  • It bleeds, making the road surface slippery.

  • Nothing, it is made for hot weather.

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40. The space _________ your vehicle is the most important to manage.
  • in back of

  • in front of

  • to the side of

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41. Tires chains:
  • Should always be carried when driving in winter weather.

  • Should never be used on asphalt.

  • Should only be used on the drive wheels.

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42. Retarders:
  • Can cause the driver wheels to skid when they have poor traction.

  • Allow you brakes. to disconnect the steering axle.

  • Cannot be used on interstate highways.

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43. Which of these statements about braking is true?
  • The heavier vehicle or the faster it is moving, the more heat the brakes have to absorb to stop it.

  • Brake drums cool very quickly when the vehicle is moving very fast.

  • Brake fade is not caused by heat.

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44. You need at least ______ inch tread depth in every major groove of your front tires.
  • 2/32

  • 4/32

  • 6/32

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45. In bad weather, many car drivers tailgate large vehicles. What should you do?
  • Increase your following distance.

  • Lightly tap your brakes to warn the tailgater to drop back.

  • Speed up to distance yourself from the tailgater.

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46. What does emergency braking mean?
  • Pushing down on the brake pedal as hard as you can.

  • Responding to a hazard by slowing the vehicle.

  • Using the vehicle's emergency brake.

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47. While driving, ice builds up on your wipers and they no longer clean the windshield. You should:
  • Keep driving, and turn your defroster on.

  • Keep driving and spray the windshield with washer fluid.

  • Stop safely and fix the problem.

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48. Road is dry and visibility is good. What is a least amount of space that you need to have in front of your vehicle?
  • 4 seconds.

  • 5 seconds.

  • 6 seconds.

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49. Which of the following about antilock braking systems is true?
  • ABS allows you to drive faster, follow more closely or drive less carefully.

  • ABS prevents power or turning skids.

  • ABS changes the way you brake in an emergency.

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50. Which of these actions are NOT recommended for a left turn?
  • Start at the inside lane and swing right as you turn.

  • Use a right-hand turn lane if there are two turning lanes.

  • Start your turn in the center of the intersection.

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