Kentucky CDL Practice Test

These questions are part of the practice quiz. Start practicing

• If you travel at 55 mph, how far will it take you to stop?
• What is the minimum tread depth required for front tires?
• What is the recommended braking technique when using antilock brakes?
• What is the recommended action if you encounter a truck tire blowout?
• How do you know if your vehicle is equipped with antilock brakes?
• Which document is required to operate a commercial vehicle?
• Which items should you check during a trip?
• Why is it essential to engage the parking brake when necessary on a hill?
• How can you check slack adjusters to ensure they are functioning properly?
• What does an "H" endorsement on a CDL permit allow the holder to transport?
• What should be done if cargo is shifting during transit?
• Which component closes to activate the spring brake when air pressure decreases?
• True or False: Coffee and fresh air will help a drinker sober up.
• How do you test hydraulic brakes for leaks?
• What should you do to avoid reacting to gestures from aggressive drivers?
• What is the recommended braking technique when descending a long downgrade?
• What is the main purpose of the Federal Motor Carrier Safety Administration (FMCSA)?
• What differentiates aggressive driving from road rage?
• True or False: All vehicles with air brakes must have a low air pressure warning signal.
• Why are placards used on vehicles?
• True or False: Front wheel brakes are good under all conditions.
• True or False: Retarders prevent skidding on slippery roads.
• Which of the following describes a possibility of fire-related hazards?
• What is the minimum distance that a commercial vehicle should be parked from a fire station?
• What does it indicate if your vehicle's air tanks are not drained regularly?
• In which scenario is it crucial to signal your intentions?
• How many red reflective triangles should you carry in your vehicle?
• Which of the following is a recommended practice before entering a curve?
• What is the main function of the brake system in a commercial vehicle?
• Why is it important to recognize overloads in cargo?
• Why is it important to make emergency plans upon seeing a hazard?
• How should you respond to a tire blowout while driving a commercial vehicle?
• To avoid loss of control during a tire blowout, what should the driver do?
• How often do drivers need to log their hours of service?
• Why is it important to understand the vehicle's height and weight?
• What is an advantage of going right instead of left around an obstacle?
• What is the best course of action when confronted by an aggressive driver?
• What is considered a hazard while driving?
• If a tire blows out, what should you avoid doing?
• If you are stopped on a hill, how can you start moving without rolling back?
• What type of fires is a B:C extinguisher not effective against?
• What do you need to check for tires during your inspection?
• Which of the following is NOT a part of the steering system?
• What does "black ice" refer to?
• What is an explanation of hydroplaning?
• What is one action to take at an accident scene to prevent further accidents?
• What should the leakage rate be for combination vehicles in one minute?
• What is one cause of tire fires?
• What is the minimum penalty for a first DUI offense for CDL holders?
• What happens if the slack adjusters are not functioning properly?
• How many tie-downs are necessary for a 20-foot load?
• What is a standee line in a bus?
• In what situation might legal maximum weights be unsafe?
• What are two basic reasons for covering cargo on an open bed?
• How can you identify if your vehicle has antilock brakes?
• Does it matter where you make a disruptive passenger get off the bus?
• When speed is doubled, how does it affect your stopping distance?
• Why is it important to be in the proper gear before descending a hill?
• What issues can arise from wet brakes?
• What is the effect of inadequate following distance?
• When should you use your turn signals?
• Which items should be checked inside a bus during a vehicle inspection?
• What should a driver do if they feel drowsy before driving?
• What vehicle feature helps prevent rollovers?
• What type of vehicle requires a Class B CDL?
• Why is it beneficial to keep your following distance reasonable?
• What three components make up the total stopping distance?
• What is the difference between Gross Combination Weight (GCW) and Gross Combination Weight Rating (GCWR)?
• Which function does the steering shaft serve?
• What should you do before entering a construction zone?
• How do antilock brakes assist drivers?
• What are the two ways to determine when to shift gears?
• What procedure should be followed to check the performance of the parking brake?
• In which two situations is it recommended to downshift?
• What should you do if you hear a siren while driving?
• When should you use low gears when driving downhill?
• What is the purpose of a pre-trip inspection?
• What is the correct procedure to follow at a railroad crossing?
• When is it safe to remove the radiator cap?
• What should you check regarding the air pressure during your vehicle inspection?
• Is stopping always the safest action to take in an emergency?
• What is the primary purpose of an air pressure gauge in a commercial vehicle?
• To check if the spring brakes come on automatically, what should you do?
• What does the air pressure gauge indicate?
• Which type of cargo securing device should be used?
• What is the correct method to ensure the spring brakes activate?
• When using an extinguisher, how far away should you stand from the fire?
• What is the primary reason for using turn signals while driving a commercial vehicle?
• What are slack adjusters?
• Which class of CDL is required to drive vehicles weighing over 26,001 lbs?
• Which is a correct statement regarding tire blowouts?
• Where should you place reflectors when stopped on a divided highway?
• What should you check the wheel bearing seals for?
• How can a driver reduce the risk of a collision with a rear-end crash?
• How do you determine how many seconds of following distance you have?
• Which component engages the brakes when air pressure is lost in the spring brake system?
• What should be the maximum weight limit observed during transportation?
• When must you stop before crossing a drawbridge?
• What types of vehicles are prone to getting stuck at railroad-highway crossings?
• What is one potential danger of using a retarder when driving on slippery roads?
• When should a driver be using their headlights?
• What is the primary goal of pre-inspection procedures in vehicle operation?
• What can you do to reduce stress while driving?
• Should you decrease your following distance if someone is following you too closely?
• What is a supply pressure gauge used for?
• What is the primary reason for wearing a seatbelt while driving a commercial vehicle?
• What does CDL stand for?
• How should a CDL driver handle fatigue?
• During a walk around inspection, which of the following should you check on the front of your vehicle?
• What should you do about tire pressure when the tires are hot?
• How often should the brake system be checked on a commercial vehicle?
• Which of the following is a common cause of vehicle skids?
• True or False: Empty trucks have the best braking capability.
• What is NOT a strategy to prevent further accidents at a crash scene?
• What is the primary purpose of the air brake system in a commercial vehicle?
• Which three types of emergency equipment must you carry in your vehicle?
• What are two main things to look for ahead while driving?
• What is a common defect in suspension systems?
• What does the term "jackknife" refer to in truck driving?
• What is the primary reason for putting the starter switch key in your pocket during a vehicle inspection?
• What is the recommended following distance in seconds for safety?
• What is a cautious way to use in-vehicle communications equipment?
• What is the function of reflectors and markers on a commercial vehicle?
• Is the statement true or false: The rear door of a transit bus has to be open to put on the parking brake?
• What can happen if you don't have enough weight on the front axle?
• What is the proper way to use turn signals when changing lanes?
• What is the minimum number of tie-downs required for any flatbed load?
• Why is it recommended to back toward the driver's side?
• What is the minimum age requirement to obtain a Kentucky CDL?
• True or False: Common medicines for colds can make you sleepy.
• What should a driver monitor to identify issues with antilock brakes?
• Which of the following is a sign of improper cargo loading?
• When checking for slack in the adjusters, how far should they move before needing adjustment?
• If you are driving a 30-foot vehicle at 55 mph, how many seconds of following distance should you allow?
• What can occur if you let air out of hot tires?
• What type of vehicle requires a Class C CDL?
• What is the maximum acceptable leakage rate for single vehicles in one minute?
• What are spring brakes?
• What is a dual air brake system?
• What should you check on the load you're transporting?
• What is the primary function of an escape ramp?
• What factors should you consider to determine a safe speed going down a downgrade?
• How can you recognize a distracted driver?
• Which of the following actions is NOT recommended when checking low pressure warning signals?
• What action should you take to test the low pressure warning signal?
• When making a right turn, if you swing wide to the left, what might happen?
• If the air loss rate is more than 3 psi for singles or 4 psi for combinations, what does it indicate?
• What should a driver do if they encounter a work zone?
• What is implied consent in the context of commercial driving?
• How far ahead should a driver look, according to best practices?
• What should you do if you are going to be late?
• Which factor can contribute to tire fires?
• What should you do if the low air pressure warning signal does not activate after testing?
• What can be a consequence of driving through deep puddles with unprotected brakes?
• Which of the following is NOT a cause of vehicle fires?
• What is required of drivers when a school bus has its stop sign extended?
• How should you handle phone calls while driving?
• What is the weight limit for a single axle on a commercial vehicle in Kentucky?
• What is the maximum legal speed for commercial vehicles in Kentucky?
• What consequence can improper gear selection lead to while driving downhill?
• What is the purpose of checking mirror condition during the inspection?
• What can having improperly secured cargo lead to?
• How should you prepare to adjust slack adjusters if they are moving more than the specified limit?
• What do hazardous materials placards identify?
• What is the maximum driving time allowed for CDL drivers before taking a mandatory break?
• What must you check before transporting a sealed load?
• What is one crucial factor to check during a pre-trip inspection?
• What item should always be present in a commercial vehicle for emergencies?
• What is the main reason for using a helper when backing up?
• Why must air tanks be drained?
• When should a low air pressure warning signal activate?
• What is the maximum blood alcohol concentration (BAC) allowed for a CDL holder in Kentucky?
• What is the most important reason for doing a vehicle inspection?
• What does the term "no zone" refer to in truck driving?
• What should drivers do if their cargo is poorly balanced?
• What is the most important hand signal that should be agreed upon between a driver and a helper?
• What is the minimum vision requirement for obtaining a CDL in Kentucky?
• What does a foot pedal air drop of more than 3 psi indicate in single vehicles?
• What is an effective way to ensure better visibility when reversing?
• What is one responsibility of drivers related to cargo?
• When backing up a commercial vehicle, what should drivers do?
• How should drivers react to the presence of emergency vehicles on the road?
• In the context of safe driving, what does "communicating" primarily refer to?
• How often should drivers inspect their cargo while on the road?
• How frequently must a commercial vehicle undergo a safety inspection?
• What type of chemicals are commonly transported as hazardous materials?
• What types of hazardous materials can be transported by bus?
• What does the term "rollover" refer to in commercial driving?
• When should automatic transmissions typically be downshifted?
• When is it recommended to use low beams while driving?
• What actions can lead to aggressive driving behavior?
• How far from a railroad crossing should you stop?
• Why do CDL drivers need to be aware of their vehicle's stopping distance?
• What is the most important way to see the sides and rear of your vehicle?
• Which of the following is classified as a "serious traffic violation" for CDL holders?
• How long does it typically take for a tractor-trailer unit to clear a double track?
• Why is it important to regularly inspect your cargo?
• Which of the following might reduce brake effectiveness?
• Why is it important to check slack adjusters regularly?