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NC CDL General Knowledge Questions
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To prevent a load from shifting, there should be at least one tiedown for every __ feet of cargo. - answer 10 You are driving a 40-foot vehicle at 35mph. The road is dry and visibility is good. What is the least amount of space you should keep in front of your vehicle to be safe? - answer 4 seconds. Which of these statements about drinking alcohol is true? - answer A few beers have the same effect on driving as a few shots of whiskey or a few glasses of wine. While driving, ice builds up on your wipers and they no longer clean the windshield. You should: - answer Stop safely and fix the problem. Which of these statements about driving in areas with strong winds is true? - answer Winds are a big problem when a truck comes out of tunnels.
What is counter-steering? - answer Turning the wheel back in the other direction after steering to avoid a traffic emergency. To help you stay alert while driving you should: - answer Take short breaks before you get drowsy. You do not have a Hazardous Materials Endorsement on your Commercial Driver's License. You can drive a vehicle hauling hazardous materials when: - answer The vehicle does not require placards. Cargo inspections: - answer Should be performed as part of your pre- trip inspection, again within the first 50 miles of your trip, then again after you have driven 3 hours or 150 miles, and after every break you take during driving. Retarders: - answer Can cause the drive wheels to skid when they have poor traction. You are driving a new truck with a manual transmission. What gear will you probably have to use to take a long, steep downhill grade? - answer A lower gear than you would use to climb the hill. Which of these statements about speed management is true? - answer You should choose a speed that lets you stop within the distance that you can see ahead.
An en route inspection should include checking for: - answer Tire overheating and brake overheating. Cargo secured properly. You're driving in the right lane of a four-lane, undivided road. You come over a hill and find a car stopped ahead in your lane. You do not have room to stop. The hill blocks your view to the rear. The shoulder is clear. Which of these is most likely the best action to take? - answer Steer to the right. Where or when should you test the stopping action of your service brakes? - answer When the vehicle is moving at about 5 mph. Which of these is not part of the pre-trip inspection of the engine compartment? - answer Valve clearance. Cargo covers: - answer Protect people from spilled cargo. May be a safety requirement in some States. High beams should be: - answer Used when it is safe and legal to do so. Which of these is the most important thing to remember about emergency braking? - answer If the wheels are skidding, you cannot control the vehicle.
You must park on the side of a level, straight, two-lane road. Where should you place the reflective triangles? - answer One within 10 feet of the rear of the vehicle, one about 100 feet to the rear, and one about 100 feet to the front of the vehicle. The road you are driving on becomes very slippery due to glare ice. Which of these is a good thing to do in such a situation? - answer Stop driving as soon as you can safely do so. Which of these statements about tires and hot-weather driving is true?
- answer You should inspect your tires every two hours or every 100 miles when driving in very hot weather. Your truck is in a traffic emergency and may collide with another vehicle if you do not take action. Which of these is a good rule to remember at such a time? - answer You can almost always turn to miss an obstacle more quickly than you can stop. What should you do when your vehicle hydroplanes? - answer Release the accelerator. You are starting your vehicle from a stop. As you apply power to the driver wheels, they start to spin. You should: - answer Take your foot off the accelerator.
You are driving on a two-lane road. An oncoming driver drifts into your lane and is headed straight for you. Which of these is most often the best action to take? - answer Steer to the right. Which of these statements about engine overheating is true? - answer You should never remove the radiator cap on a pressurized system until the system has cooled. You are driving a truck with a manual transmission. You have to stop the truck on the shoulder while driving on an uphill grade. Which of these is a good rule to follow when putting it back in motion up the grade? - answer Use the parking brake to hold the vehicle until the clutch engages. A vehicle is loaded with most of the weight on the steering axle. What may result? - answer Hard steering and possible damage to the tires. You are driving a 40-foot vehicle at 50 mph. Driving conditions are ideal (dry pavement, good visibility). What is the least amount of space that you should keep in front of your vehicle to be safe? - answer 5 seconds. Which of these is a good thing to do when steering to avoid a crash? - answer Do not turn any more than needed to clear what is in your way.
You are checking your wheels and rims for a pre-trip inspection. Which of these statements is true? - answer Rust around lug nuts may mean that they are loose. You do not have a Hazardous Materials Endorsement on your Commercial Driver's License. You are asked to deliver hazardous material in a placarded vehicle. You should: - answer Refuse to haul the load. As the Blood Alcohol Concentration (BAC} goes up, what happens? - answer Judgment and self-control are affected. If you need to leave the road in a traffic emergency, you should: - answer Avoid braking until your speed has dropped to about 20mph. Which of these statements about downshifting for a long downhill grade is true? - answer It allows engine compression and friction to help slow the vehicle. When looking ahead of your vehicle while driving you should look: - answer Back and forth, near and far. Escape ramps are: - answer Used to stop runaway vehicles.
The most important reason for being alert to hazards is so: - answer You will have time to plan your escape if the hazard becomes an emergency. Hydroplaning: - answer Is more likely if tire pressure is low. If you are being tailgated, you should: - answer Increase your following distance. Which of these statements about overhead clearance is true? - answer The weight of a vehicle changes its height. Which of these is a good rule to follow when using a fire extinguisher? - answer Aim at the base of the fire. While driving, you see a small (1-foot square) cardboard box ahead in your lane. You should: - answer Steer around it without making a sudden or unsafe move. Is it legal to drive with one fourth of a vehicle's leaf springs broken or missing? - answer No. Which of these can cause a fire? - answer Loose fuel connections. Under-inflated tires. Electrical short circuits.
Dry Bulk tanks and hanging meat: - answer Are unstable loads. Which of the following should you NOT do in the event of hydraulic brake failure? - answer Shift up. To correct a drive-wheel braking skid you should: - answer Counter- steer. Which of the following statements about tank vehicles is true? - answer Special skills are required to haul liquid tanks. If you are driving a long distance, you should: - answer Stop often and take short breaks before you feel really drowsy or tired. Which of the following is true about a vehicle with a high center of gravity? - answer The cargo should be rearranged so that the heaviest parts of the cargo are under the lightest parts. To prevent skidding, you should: - answer Adjust to conditions while driving. You should back and turn toward the driver's side: - answer So you can watch the rear of the vehicle by looking out the side window.
The new BAC (Blood Alcohol Concentration) for commercial drivers to be considered intoxicated when driving a commercial vehicle is: - answer. Truck escape ramps: - answer Are designed to protect vehicles from damage. Which of these can cause the vehicle to skid? - answer Not enough weight on the front axle. Over acceleration. Turning too sharply. Which of these describes how you should use the brake pedal on a steep downhill grade? - answer Release the brake when you are 5 MPH below your safe speed, then let your speed come back up to your safe speed and repeat braking again (bring your speed down 5 MPH below your safe speed). An en-route inspection should include checking: - answer Cargo doors and/or cargo securement. Tire temperature. Brake temperature. According to the driver's manual, why should you limit the use of your horn? - answer It can startle other drivers.
The amount of liquid to load into a tank depends on: - answer The weight of the liquid. The legal weight limits. The amount of liquid will expand in transit. You should use your mirrors to check: - answer Traffic gaps before you merge. The condition of the tires and cargo. Where the rear of your vehicle is while you make turns. Your brakes can get wet when you drive through a heavy rain. What can this cause when the brakes are applied? - answer Lack of braking power. Trailer jackknife. Wheel lockup. Which of these statements about using mirrors is true? - answer There are blind spots that your mirrors cannot show you. To avoid a crash, you had to drive onto the right shoulder. You are now driving at 40 MPH on the shoulder. How should you move back onto the pavement? - answer Come to a complete stop, if possible, before steering back onto the pavement. Which of these statements about managing space is true? - answer When the road is slippery, you should keep much more space in front of your vehicle.
Which of these tell you that cargo contains hazardous materials? - answer A four-inch, diamond shaped hazardous materials label on the container. A hazardous materials placard on the vehicle. If you are convicted for driving under the influence while driving a commercial vehicle, and this is your first offense, you will most likely get: - answer At least a one-year suspension of your CDL. Some liquid tanks are divided into several smaller tanks by: - answer Bulkheads. Front-end header boards: - answer Block the forward movement of your cargo. Protect you from your cargo in case of collision. The height of the vehicle center of gravity is very important for safe handling. A high center of gravity means you are more likely to do the following: - answer Rollover. The "load" means the following? - answer The maximum safe weight a tire can carry at a specified pressure.
