CDL General Knowledge Practice Test

These General Knowledge practice questions are meant to accompany our Free Online CDL Courses. You will NOT see these questions on your test at motor vehicle. Check out the full courses if you find these questions difficult. Good luck in your CDL pursuit. Let us know if we can help in any way.


Question. Truck Escape Ramps:



Correct.




Correct.




Try Again.




Try Again.


Question. Which of these can cause the vehicle to skid?



Try Again.




Try Again.




Try Again.




Correct.


Question. Every time you park your vehicle and shut the engine off you should:



Try Again.




Correct.




Try Again.




Try Again.


Question. You are driving a vehicle that could safely be driven at 55 MPH on an open road. But traffic is now heavy, moving at 35 MPH although the speed limit is 55. The safest possible speed for your vehicle in this situation is most likely:



Try Again.




Try Again.




Correct.


Question. Which of these describes how you should use the brake pedal on a steep downhill grade?



Correct.




Try Again.




Try Again.




Try Again.


Question. For an average commercial vehicle, being driven at 55 MPH on dry pavement it will take about____ to bring the vehicle to a stop.



Try Again.




Try Again.




Try Again.




Correct.


Question. Which of these statements about certain types of cargo is true?



Try Again.




Try Again.




Correct.


Question. Which of these statement about backing a heavy vehicle is true?



Try Again.




Try Again.




Try Again.




Correct.


Question. When should you wear seat belts?



Try Again.




Correct.




Try Again.




Try Again.


Question. The most common cause of serious vehicle skids is:



Correct.




Try Again.




Try Again.


Question. If you are being tailgated, you should:



Try Again.




Try Again.




Try Again.




Correct.



Question. The parking brake should be tested while the vehicle is:



Try Again.




Try Again.




Try Again.




Correct.


Question. A drivers trip log, if required:



Try Again.




Try Again.




Correct.




Try Again.


Question. Should the pre-trip inspection report from the last driver be reviewed during your pre-trip inspection?



Correct.




Try Again.


Question. If you are stopped at a roadside inspection and found to have a BAC (Blood Alcohol Concentration) of .02 you will:



Try Again.




Correct.




Try Again.




Try Again.


Question. When roads are slippery, you should:



Try Again.




Try Again.




Try Again.




Correct.


Question. If a tire blows out in a commercial vehicle, you should put the brakes on hard to stop quickly.



Try Again.




Correct.


Question. What type of vehicles can get stuck on a railroad crossing?



Correct.




Try Again.




Try Again.




Try Again.


Question. While driving, you see a small (1 foot square) cardboard box ahead in your lane. You should:



Correct.




Try Again.




Try Again.




Try Again.


Question. Which of the pieces of emergency equipment should be carried at all times in your vehicle.



Try Again.




Try Again.




Try Again.




Correct.


Question. What is counter steering?



Try Again.




Try Again.




Correct.




Try Again.


Question. You do not have a hazardous materials endorsement on your commercial license. When can you drive a vehicle hauling hazardous materials?



Try Again.




Try Again.




Correct.




Try Again.


Question. You are driving a new truck with a manual transmission. What gear will you probably have to use to take a long downhill grade?



Correct.




Try Again.




Try Again.




Try Again.


Question. High beams should be:



Try Again.




Correct.




Try Again.




Try Again.


Question. An en-route inspection should include checking:



Try Again.




Try Again.




Try Again.




Correct.


Question. Where or when should you test the stopping action of your service brakes?



Try Again.




Try Again.




Correct.




Try Again.


Question. Stab braking:



Try Again.




Correct.




Try Again.




Try Again.


Question. Which of these statements about using turn signals is true?



Try Again.




Correct.




Try Again.




Try Again.


Question. Retarders:



Try Again.




Try Again.




Try Again.




Correct.


Question. Which of these statements about staying alert to drive is true?



Try Again.




Try Again.




Correct.




Try Again.


Question. 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 generally the best action?



Correct.




Try Again.




Try Again.




Try Again.


Question. You should avoid driving through deep puddles or flowing water. But if you must, which of these steps can help keep your brakes working?



Try Again.




Correct.




Try Again.




Try Again.



Question. Which of these statements about brakes is true?



Try Again.




Try Again.




Correct.


Question. What should you do when your vehicle hydroplanes?



Correct.




Try Again.




Try Again.




Try Again.


Question. Which fires can you use water to put out?



Try Again.




Correct.




Try Again.




Try Again.


Question. Your vehicle 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?



Try Again.




Try Again.




Correct.




Try Again.


Question. Which of these is a sign of a tire failure?



Try Again.




Try Again.




Try Again.




Correct.


Question. Which of these statements about drinking alcohol is true?



Try Again.




Correct.




Try Again.




Try Again.


Question. Which of these can help you stay alert while driving?



Correct.




Try Again.




Try Again.




Try Again.


Question. Which one of these is not part of the check of the engine compartment done for a pre-trip inspection?



Try Again.




Try Again.




Try Again.




Correct.


Question. According to the driver's manual, why should you limit the use of your horn?



Try Again.




Correct.




Try Again.




Try Again.


Question. You are traveling down a long, steep hill. Your brakes get so hot that they fail. What should you do?



Try Again.




Try Again.




Correct.




Try Again.


Question. How far should a driver look ahead of the vehicle while driving?



Try Again.




Try Again.




Correct.




Try Again.


Question. Which of these statements about cargo loading is true?



Correct.




Try Again.




Try Again.




Try Again.


Question. Which of these statements about marking a stopped vehicle is true?



Try Again.




Correct.




Try Again.


Question. You are driving a 40 foot vehicle at 45 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?



Try Again.




Try Again.




Try Again.




Correct.


Question. The amount of liquid to load into a tank depends on:



Try Again.




Try Again.




Try Again.




Correct.


Question. You are starting your vehicle in motion from a stop. As you apply power to the drive wheels, they start to spin. You should:



Try Again.




Try Again.




Correct.




Try Again.


Question. You should use mirrors to check:



Try Again.




Try Again.




Try Again.




Correct.


Question. The proper way to hold the steering wheel is at clock positions:



Try Again.




Correct.




Try Again.




Try Again.


Question. Cargo inspections:



Correct.




Try Again.




Try Again.




Try Again.


Question. Your brakes can get wet when you drive through a heavy rain. What can this cause when the brakes are applied?



Try Again.




Try Again.




Try Again.




Try Again.


Question. How do you test hydraulic brakes for leaks?



Try Again.




Correct.




Try Again.




Try Again.


Question. Which of these is a good rule to follow when driving at night.



Try Again.




Try Again.




Correct.




Try Again.



Question. A vehicle is loaded with very little weight on the drive axle. What may result?



Try Again.




Try Again.




Try Again.




Correct.


Question. The key principle in balancing cargo weight is to keep the load:



Try Again.




Correct.




Try Again.




Try Again.


Question. Which of these statements about using mirrors is true?



Correct.




Try Again.




Try Again.




Try Again.


Question. Which of these statements about cold weather driving is true?



Try Again.




Try Again.




Try Again.




Correct.


Question. The most important reason for being alert to hazards is so:



Correct.




Try Again.




Try Again.




Try Again.


Question. Which of these is a good rule to follow when using a fire extinguisher?



Try Again.




Try Again.




Correct.




Try Again.


Question. Is it legal to drive with one fourth of a vehicles leaf springs broken or missing?



Try Again.




Try Again.




Correct.




Try Again.


Question. You have left the road in an emergency condition, it is



Try Again.




Try Again.




Try Again.




Correct.




Try Again.


Question. Which of these statements about down shifting is true.



Correct.




Try Again.




Try Again.




Try Again.


Question. Which of these statements about drugs is true?



Try Again.




Try Again.




Correct.




Try Again.


Question. To avoid a crash, you had to drive onto the right shoulder. You are now driving at 40 MPH n the shoulder. How should you move back onto the pavement?



Try Again.




Try Again.




Try Again.




Correct.


Question. Which of these statements about managing space is true?



Try Again.




Correct.




Try Again.




Try Again.


Question. Which of these is the most important things to remember about emergency braking?



Correct.




Try Again.




Try Again.




Try Again.


Question. To correct a rear wheel (drive wheel) braking skid, you should:



Try Again.




Try Again.




Try Again.




Correct.


Question. While driving, ice builds up on your wipers and they no longer clean the windshield. You should:



Try Again.




Try Again.




Correct.




Try Again.


Question. 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?



Try Again.




Try Again.




Try Again.




Correct.


Question. You must park on the side of a level. straight, two lane road. Where should you place the three reflective triangles?



Try Again.




Try Again.




Correct.




Try Again.


Question. You are 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, and the hill blocks your view to the rear. Which of these is most likely the best action to take?



Correct.




Try Again.




Try Again.




Try Again.


Question. You are checking your tires for a pre-trip inspection. Which of these statements is true?



Correct.




Try Again.




Try Again.




Try Again.


Question. The first step to take if your vehicle catches fire while driving is:



Try Again.




Correct.




Try Again.




Try Again.


Question. Which of these statements about double clutching and shifting is true?



Try Again.




Try Again.




Correct.




Try Again.


Question. The center of gravity of a load:



Try Again.




Try Again.




Correct.




Try Again.


Question. You are testing the stopping action of the service brakes on a hydraulic system. Which of these can mean there is a problem?



Try Again.




Try Again.




Try Again.




Correct.


Question. The distance you should look ahead of your vehicle while driving amounts to about ______ at highway speed.



Try Again.




Try Again.




Correct.




Try Again.


Question. Which of these statements about tires and hot weather driving is true?



Try Again.




Correct.




Try Again.




Try Again.


Question. You are driving a 40 foot vehicle at 35 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?



Try Again.




Try Again.




Correct.




Try Again.


Question. A moving vehicle ahead of you has a red triangle with an orange center on the rear. What does this mean?



Try Again.




Try Again.




Try Again.




Correct.


Question. Which of these statements about drinking alcohol is true?



Try Again.




Try Again.




Try Again.




Correct.


Question. On which fires can you use the "ABC" fire extinguisher?



Try Again.




Try Again.




Try Again.




Correct.


Question. Which of these statements about speed management is true?



Try Again.




Try Again.




Correct.




Try Again.


Question. Cargo that can shift should have at least tie downs.



Try Again.




Correct.




Try Again.




Try Again.


Question. If a straight vehicle (no trailer or articulation) goes into a front wheel skid it will:



Try Again.




Correct.




Try Again.




Try Again.


Question. Which of these is a proper use of vehicle lights and flashers?



Try Again.




Try Again.




Try Again.




Correct.


Question. Which of these statements about crossing or entering traffic with a heavy vehicle is true?



Correct.




Try Again.




Try Again.




Try Again.


Question. You are checking your wheels and rims for a pre-trip inspection. Which of these statements is true?



Try Again.




Try Again.




Correct.




Try Again.


Question. Controlled braking:



Correct.




Try Again.




Try Again.




Try Again.


Question. Your vehicle has hydraulic brakes. While traveling on a level road you press the brake pedal and find that it goes to the floor. Which of these statements is true?



Try Again.




Correct.




Try Again.




Try Again.


Question. Which of these statements about escape ramps is true?



Try Again.




Try Again.




Correct.




Try Again.


Question. Which of these tell you that cargo contains hazardous materials?



Try Again.




Try Again.




Try Again.




Correct.


Question. To prevent shifting, there should be at least one tie down for every_______________feet of cargo.



Correct.




Try Again.




Try Again.




Try Again.


Question. Cargo covers:



Try Again.




Try Again.




Try Again.




Correct.


Question. Which of these statements about accelerating is true?



Try Again.




Correct.




Try Again.




Try Again.


Question. You are driving a heavy vehicle with a manual transmission. You have to stop the vehicle on the shoulder while driving on an upgrade. Which of these is a good rule to follow when putting it back in motion.



Correct.




Try Again.




Try Again.




Try Again.


Question. Which of these can cause a fire?



Try Again.




Try Again.




Try Again.




Correct.


Question. You are checking your steering and exhaust system for a pre-trip inspection. Which of these statements is true?



Try Again.




Try Again.




Correct.




Try Again.


Question. A vehicle is loaded with most of the weight on the steering axle. What may result?





Try Again.




Try Again.




Correct.