CDL General Knowledge Test practice questions
237 free questions with answers and explanations.
- 51.When driving a combination vehicle, what is the primary danger associated with 'trailer swing' during a turn?Combination Vehicles (if applicable)
- 52.When inspecting the fifth wheel assembly of a combination vehicle, what is the significance of worn or missing fifth wheel skid plate fasteners?Combination Vehicles (if applicable)
- 53.A driver needs to adjust the slack adjusters on a combination vehicle. Which of the following statements about adjusting automatic slack adjusters is correct?Combination Vehicles (if applicable)
- 54.You are driving a combination vehicle and experience a 'trailer jackknife' during emergency braking on a slippery road. What is the most effective immediate action to recover from this situation?Combination Vehicles (if applicable)
- 55.To prevent a 'jackknife' when braking a combination vehicle, especially on slippery surfaces, what is the most effective technique?Combination Vehicles (if applicable)
- 56.You are driving a combination vehicle and notice that the trailer is 'fishtailing' or swinging from side to side. What is the MOST appropriate immediate action to regain control?Combination Vehicles (if applicable)
- 57.During a pre-trip inspection, a driver notices that the fifth wheel locking jaws are not fully closed around the kingpin. What is the immediate required action?Combination Vehicles (if applicable)
- 58.When driving a combination vehicle, what is the most significant factor that increases the risk of a 'rearward amplification' or 'crack-the-whip' effect?Combination Vehicles (if applicable)
- 59.A driver notices that during a full brake application, the trailer brakes lock up before the tractor brakes. What is the MOST likely cause of this issue?Combination Vehicles (if applicable)
- 60.What is the primary reason for performing a 'tug test' after coupling a tractor to a semi-trailer?Combination Vehicles (if applicable)
- 61.When driving a combination vehicle, what is the most critical factor to consider regarding the placement of heavy loads in the trailer?Combination Vehicles (if applicable)
- 62.What is the maximum acceptable amount of play (movement) for a properly coupled kingpin within the fifth wheel jaws?Combination Vehicles (if applicable)
- 63.A driver is performing a pre-trip inspection. When checking the slack adjusters on a combination vehicle, what is the maximum allowable movement (play) when pulled by hand?Combination Vehicles (if applicable)
- 64.When driving a loaded combination vehicle down a long, steep grade, which of the following is the MOST effective method to control your speed and prevent brake fade?Combination Vehicles (if applicable)
- 65.A driver is preparing to couple a tractor to a semi-trailer. After backing the tractor under the trailer and before raising the landing gear, what is the next critical step to ensure a secure coupling?Combination Vehicles (if applicable)
- 66.A driver is performing a pre-trip inspection of the fifth wheel assembly. Which of the following indicates a safe and properly coupled connection?Combination Vehicles (if applicable)
- 67.When backing a combination vehicle, what is the primary reason to use your mirrors frequently and make small steering corrections?Combination Vehicles (if applicable)
- 68.During coupling, after backing the tractor under the trailer and before raising the landing gear, what is the next critical step to ensure a secure connection?Combination Vehicles (if applicable)
- 69.When inspecting the air lines (hoses) connecting the tractor to the trailer, what is the most critical defect that would require immediate repair or removal from service?Combination Vehicles (if applicable)
- 70.You are driving a combination vehicle and notice that the trailer brakes are locking up frequently, especially when braking lightly. What is a common cause of this issue?Combination Vehicles (if applicable)
- 71.A driver notices significant 'chucking' or surging when accelerating or decelerating a combination vehicle. What is the most likely cause?Combination Vehicles (if applicable)
- 72.A driver is preparing to couple a tractor to a semi-trailer on a slightly sloped surface. What is the most critical initial step to prevent the trailer from moving unexpectedly?Combination Vehicles (if applicable)
- 73.What is the primary purpose of the 'trailer hand valve' (trolley valve) on a combination vehicle?Combination Vehicles (if applicable)
- 74.During a pre-trip inspection of a combination vehicle, how much free play is acceptable in the steering wheel?Combination Vehicles (if applicable)
- 75.Which of the following conditions is most likely to cause a 'rearward amplification' effect in a combination vehicle?Combination Vehicles (if applicable)
- 76.A driver is inspecting the air lines (hoses) connecting the tractor to the trailer. Which of the following conditions represents a critical safety defect that would put the vehicle out of service?Combination Vehicles (if applicable)
- 77.A driver is inspecting the air lines (hoses) connecting the tractor and trailer. Which of the following conditions would require immediate repair before driving?Combination Vehicles (if applicable)
- 78.A driver is transporting a liquid bulk load in a partially filled tank. Which of the following forces presents the greatest risk during braking or turning?Transporting Cargo Safely
- 79.A commercial driver is preparing to transport a load of coiled steel. Which of the following securement methods is specifically recommended for preventing longitudinal movement of the coils?Transporting Cargo Safely
- 80.A driver is transporting a flatbed load of lumber. According to federal regulations, what is the minimum number of tie-downs required for a 20-foot load of lumber that is not fully contained by the vehicle's structure?Transporting Cargo Safely
- 81.A driver is transporting a large, heavy machine that is bolted directly to the truck's frame. What type of securement is primarily being utilized?Transporting Cargo Safely
- 82.During a pre-trip inspection, a driver notices that the aggregate working load limit (WLL) of the tie-downs used to secure a 40,000-pound load is 18,000 pounds. What action should the driver take?Transporting Cargo Safely
- 83.A driver is inspecting a sealed trailer containing general freight. Which of the following is an acceptable method for determining if the cargo is properly secured without breaking the seal?Transporting Cargo Safely
- 84.A driver is transporting 5 large rolls of paper, each weighing 8,000 pounds. The rolls are placed side-by-side on a flatbed trailer. According to securement regulations, what is the minimum total working load limit (WLL) required for all tie-downs combined to secure this entire load?Transporting Cargo Safely
- 85.Which of the following statements about inspecting cargo in a dry van trailer is true?Transporting Cargo Safely
- 86.A driver is transporting a load of hanging meat in a refrigerated trailer. What is the primary concern regarding cargo balance for this type of load?Transporting Cargo Safely
- 87.When transporting a load that extends more than 4 feet beyond the rear of the vehicle during daylight hours, what is the minimum marking requirement?Transporting Cargo Safely
- 88.A commercial driver is preparing to transport a load of irregularly shaped machinery. Which of the following is the most critical factor to consider when securing this type of cargo?Transporting Cargo Safely
- 89.When transporting livestock, which of the following is a primary concern for the driver?Transporting Cargo Safely
- 90.According to federal regulations, what is the minimum aggregate working load limit (WLL) required for all tiedowns securing a piece of cargo weighing 50,000 pounds?Transporting Cargo Safely
- 91.When transporting a load of logs that are not contained within a bunk or cradle, what is the minimum number of tiedowns required for a single log that is 25 feet long?Transporting Cargo Safely
- 92.A driver is transporting a load of baled hay on a flatbed trailer. The bales are stacked two high. What is a specific requirement for securing baled hay?Transporting Cargo Safely
- 93.When loading a refrigerated trailer, what is the most important factor to consider to ensure proper airflow and temperature consistent throughout the cargo?Transporting Cargo Safely
- 94.What is the purpose of using header boards (headaches racks) on a flatbed trailer?Transporting Cargo Safely
- 95.A driver is transporting a flatbed load of construction materials. The load is 6 feet high and 8 feet wide. Which of the following is the minimum number of tie-downs required for this load, assuming it is 15 feet long and weighs 25,000 pounds?Transporting Cargo Safely
- 96.A driver is transporting a load of heavy, rigid cargo that is bolted directly to the trailer frame. This type of securement is known as:Transporting Cargo Safely
- 97.A commercial driver is preparing to transport a load of vehicles (e.g., cars, trucks) on a car carrier. Which of the following is a specific requirement for securing vehicles as cargo?Transporting Cargo Safely
- 98.A driver is transporting a load of heavy, irregularly shaped machinery on a flatbed trailer. The machinery is secured with chains. What is the minimum number of tiedowns required for a piece of equipment that is 15 feet long and weighs 25,000 pounds, assuming no blocking is used?Transporting Cargo Safely
- 99.A driver is transporting a load of dressed lumber that is 8 feet high and 40 feet long on a flatbed trailer. The lumber is bundled, but not otherwise contained by sideboards or stakes. What is the minimum number of tiedowns required for this load?Transporting Cargo Safely
- 100.What is the primary reason for distributing cargo weight evenly across all axles?Transporting Cargo Safely