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California CDL General Knowledge Test Questions and Answers – 330+ Solved
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Q. To prevent a load from shifting, there should be at least one tie down for every _ feet of cargo.
Q. You are driving a 40-foot vehicle at 35 mph. The road is dry, and visibility is good . What is the least amount of space you Ans should keep in front of your vehicle to be safe?
Ans: 4 seconds
Q. According to the state of California, what is the most important and obvious reason to check your vehicle?
Q. According to the state of California, you are considered involved in interstate commerce UNLESS the cargo you are transporting
Ans: originates in the state and is headed for a location in the state.
Q. Which of these statements about drinking alcohol is true?
Ans: A few beers have the same effect on driving as a few shots of whiskey or a few glasses of wine.
Q. You should check your tires every _ or every _ when driving in very hot weather.
Ans: 2 hours, 100 miles
Q. While driving, ice builds up on your wipers and they no longer clean the windshield. You should:
Ans: Stop safely and fix the problem.
Q. Which of these statements about driving in areas with strong winds is true?
Ans: Winds are a big problem when a truck comes out of tunnels.
Q. What is counter-steering?
Ans: Turning the wheel back in the other direction after steering to avoid a traffic emergency.
Q. To help you stay alert while driving, you should:
Ans: Take short breaks before you get drowsy.
Q. You do not have a Hazardous Materials Endorsement on your Commercial Driver’s License. You can drive a vehicle hauling hazardous materials when:
Ans: The vehicle does not require placards.
Q. 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?
Ans: A lower gear than you would use to climb the hill.
Q. The steps for checking your signal lights include the following
Ans: Turn off all lights, turn onn the stop lights, and turn on the left turn signal lights
Q. Which of these statements about speed management is true?
Ans: You should choose a speed that lets you stop within the distance that you can see ahead.
Q. On wet roads, you should reduce your speed by
Q. Which of these best describes how you should use the brake pedal on a steep downhill grade?
Q. If you are involved in a collision, you should
-notify the proper authorities
-gather appropriate information for a collision report
-do the best you can to care for injured persons
Q. How far ahead do most good drivers look, according to the Handbook?
Ans: 12 to 15 seconds
Q. Which of these statements about double clutching and shifting is true?
Ans: You can use the tachometer to tell you when to shift.
Q. Which if these statements about using turn signals is true?
Ans: When turning, you should signal early.
Q. Which of these statements about cargo loading is true?
Ans: State laws dictate legal weight limits.
Q. If your vehicle catches fire while you are driving, you should:
Ans: Park in an open area.
Q. You are checking your tires for a pre-trip inspection. Which of these statements is true?
Ans: Tires of mismatched sizes should not be used on the same vehicle.
Q. Which of the following factors is NOT used to determine your safe speed when going down a long steep downgrade?
Ans: Time of day
Q. You can see a marking on a vehicle ahead of you. The marking is a red triangle with an orange center. What does the marking mean?
Ans: It may be a slow-moving vehicle.
Q. An en route inspection should include checking for:
Ans: (Both are correct) Tire overheating and brake overheating; Cargo secured properly.
Q. 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. Ans: 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 nest action to take?
Steer to the right.
Q. To help you stay alert and safe while driving, you should
Ans: avoid medications whose warning labels mention drowsiness
Q. Where or when should you test the stopping action of your service brakes?
Ans: When the vehicle is moving about 5 mph.
Q. Which of these is not part of the pre-trip inspection of the engine compartment?
Ans: Valve clearance
Q. Which of these is NOT part of the basic method for shifting up?
Ans: Accelerate while pressing the clutch and turning toward the driver’s side.
Q. High beams should be:
Ans: Used when it is safe to do so.
Q. Which of these is the most important thing to remember about emergency braking?
Ans: If the wheels are skidding, you cannot control the vehicle.
Q. With the controlled braking method, you _?
Ans: Apply the brakes as hard as you can without locking the wheels
Q. You must park on the side of a level, straight, two-lane road. Where should you place the reflective triangles?
Ans: 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.
Q. 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?
Ans: Stop driving as soon as you can safely do so.
Q. Which of these statements about tires and hot-weather driving is true?
Ans: You should inspect your tires every two hours or very 100 miles when driving in very hot weather.
Q. 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?
Ans: You can almost always turn to miss an obstacle more quickly than you can stop.
Q. Which of the following is NOT a basic step to be taken at a crash scene?
Ans: Gather the contact information of all the drivers involved
Q. What should you do when your vehicle hydroplanes?
Ans: Release the accelerator.
Q. You are starting your vehicle from a stop. As you apply power to the driver wheels, they start to spin. You should:
Ans: Take your foot off the accelerator.
Q. It takes the body about _ hours to get rid of the alcohol in four drinks.
Q. Cargo that can shift should have at least _ tie-downs.
Q. If a straight vehicle (no trailer or articulation) goes into a front-wheel skid, it will:
Ans: Go straight ahead even if the steering wheel is turned.
Q. Which of these statements about accelerating is true?
Ans: Rough acceleration can cause mechanical damage.
Q. Which of these is a good thing to remember when crossing or entering traffic with a heavy vehicle?
Ans: Heavy vehicles need larger gaps in traffic than cars.
Q. Which of these statements about staying alert to drive is true?
Ans: Sleep is the only thing that can overcome fatigue.
Q. 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 Ans: most often the best action to take?
Steer to the right.
Q. Which of these statements about engine overheating is true?
Ans: You should never remove the radiator cap on a pressurized system until the system has cooled.
Q. You are driving a truck with a manual transmission. You have to stop the truck on the shoulder while driving on an uphill grade. Ans: Which of these is a good rule to follow when putting it back in motion up the grade?
Use the parking brake to hold the vehicle until the clutch engages.
Q. Which of these should you do during a trip as part of your en route inspection?
-watch your gauges to check for trouble
-pay attention with your senses to possible problems
-check critical items when you stop, such as brakes, tires, and lights
Q. A vehicle is loaded with most of the weight on the steering axle. What may result?
Ans: Hard steering and possible damage to the tires.
Q. 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?
Ans: 5 seconds
Q. Which of these things is a good thing to do when steering to avoid a crash?
Ans: Do not turn any more than needed to clear what is in your way?
Q. You are checking your wheels and rims for a pre-trip inspection. Which of these statements is true?
Ans: Rust around lug nuts may mean that they are loose.
Q. You do not have Hazardous Materials Endorsement on your Commercial Driver’s License. You are asked to deliver hazardous material Ans: in a placarded vehicle. You should:
Refuse to haul the load.
Q. As the Blood Alcohol Concentration (BAC) goes up, what happens?
Ans: Judgment and self-control are affected.
Q. Which contains more alcohol: a 12-ounce glass of 5% beer, a 5-ounce glass of 12% wine or a 1 1/2-ounce shot of 80-proof liquor.
Ans: They all contain the same amount of alcohol
Q. If you need to leave the road in a traffic emergency, you should:
Ans: Avoid braking until your speed has dropped to about 20 mph.
Q. Which of these statements about downshifting for a long downhill grade is true?
Ans: It allows engine compression and friction to help slow the vehicle.
Q. When looking ahead of your vehicle while driving you should look:
Ans: Back and forth near and far.
Q. Escape ramps are:
Ans: Used to stop runaway vehicles.
Q. Which of these statements about cold-weather driving is true?
Ans: Windshield washer antifreeze should be used.
Q. When should you wear seat belts?
Ans: Anytime you are in a moving vehicle.
Q. How do you correct a rear-wheel acceleration skid?
Ans: Stop accelerating.
Q. Which of these is NOT a good rule to follow when caring for injured at an accident scene?
Ans: Keep injured persons cool.
Q. Which of these is NOT a rule to follow for backing safely?
Ans: Accelerate slightly to complete the backing process quickly
Q. For your safety, when setting out reflective triangles you should:
Ans: Hold the triangles between yourself and oncoming traffic
Q. Heavy vehicles must sometimes travel more slowly than other traffic. Which of these is NOT a good rule to follow when you are driving such a vehicle?
Ans: Signal other drivers when it is safe for them to pass you.
Q. The most important reason for being alert to hazards is so:
Ans: You will have time to plan your escape if the hazard becomes an emergency.
Q. If you are being tailgated, you should:
Ans: Increase your following distance.
Q. Vehicle handling can become unsafe if the weight is not properly balanced. Hard steering can be caused by
Ans: Too much weight on the steering axles
Q. Which of these statements about overhead clearance is true?
Ans: The weight of a vehicle changes its height.
Q. Which of these is a good rule to follow when using a fire extinguisher?
Ans: Aim at the base of the fire.
Q. While driving, you see a small (1 foot square) cardboard box ahead in your lane. You should:
Ans: Steer around it with out making a sudden or unsafe move.
Q. Is it legal to drive with one fourth of a vehicles leaf springs broken or missing?
Q. Which of these can cause a fire?
Ans: (all are correct) Loose fuel connections; under-inflated tire; electrical short circuits.
Q. Dry bulk tanks and hanging meat:
Ans: Are unstable loads.
Q. Which of the following should you NOT do if you experience a tire failure?
Ans: Apply the brakes hard and immediately
Q. Which of the following should you NOT do in the event of hydraulic brake failure?
Ans: Shift up
Q. Which of the following should you NOT do when you are being tailgated?
Ans: Speed up
Q. Which of the following should you NOT do while driving at night?
Ans: Avoid using your high beams, just in case.
Q. To correct a drive -wheel braking skid you should:
Q. Which of the following statements about tank vehicles is true?
Ans: Special skills are required to haul liquid tanks.
Q. If you are driving a long distance, you should:
Ans: Stop often and take short breaks before you feel really drowsy or tired.
Q. Which of the following is true about a vehicle with a high center of gravity?
Ans: The cargo should be rearranged so that the heaviest parts of the cargo are under the lightest parts.
Q. To prevent skidding, you should:
Ans: Adjust to conditions while driving.
Q. You should back and turn toward the driver’s side:
Ans: So you can watch the rear of the vehicle by looking out the side window.
Q. When you check the condition of visible parts during your pre-trip inspection, make sure that the _ are secured against snagging, rubbing or wearing.
Ans: Airlines and electrical wiring.
Q. During your pre-trip test, when examining hoses with the instructor, you need to look for
Ans: puddles on the ground
Q. With a BAC of _, most people lose consciousness, and some die.
Q. The distance your vehicle travels from the time your eyes see a hazard until your brain recognizes it is called __ distance.
Q. Which of these items is checked in a pre-trip inspection?
Ans: (all are correct) Whether all vehicle lights are working and clean; cargo securement; wiper blades.
Q. The “reaction distance” is the distance traveled from the time:
Ans: The brain tells the foot to push the brake pedal to the time the foot actually pushes the pedal.
Q. When driving a commercial vehicle with a height over 13 feet, you should:
Ans: If you aren’t sure a clearance is high enough, stop and make sure.
Q. The purpose of a baffle is to:
Ans: Control the load surge.
Q. The new BAC (Blood Alcohol Concentration) for commercial drivers to be considered intoxicated when driving a commercial vehicle is:
Q. Truck escape ramps:
Ans: Are designed to protect vehicles from damage.
Q. Which of these can cause the vehicle to skid?
Ans: (All) Not enough weight on the front axle; over acceleration; turning too sharply.
Q. Which of these describes how you should use the brake pedal on a steep downhill grade?
Ans: 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).
Q. An en-route inspection should include the following
Ans: (all) cargo doors and / or cargo securement; tire temperature; brake temperature.
Q. According to the driver’s manual, why should you limit the use of your horn?
Ans: It can startle other drivers.
Q. The amount of liquid to load into a tank depends on:
Ans: (all) The weight of the liquid; the legal weight limits; the amount of liquid will expand in transit.
Q. You should use your mirrors to check:
Ans: (all) traffic gaps before you merge; the condition of the tires and cargo; where the rear of your vehicle is while you make turns.
Q. Your brakes can get wet when drive through heavy rain. What can this cause when the brakes are applied?
Ans: (all) lack of braking power; trailer jackknife; wheel lockup.
Q. Which of these statements about using mirrors is true?
Ans: There are blind spots that your mirrors cannot show you.
Q. To avoid a crash you had to drive onto the right shoulder. You are now driving 40 mph on the shoulder. How should you move back onto the pavement?
Ans: Come to a complete stop, if possible, before steering back onto the pavement.
Q. Which of these statements about managing space is true?
Ans: When the road is slippery, you should keep much more space in front of your vehicle.
Q. You are testing the stopping action of service brakes on a hydraulic system. Which of these can mean there is a problem?
Ans: (all) The brake pedal goes to the floor; stopping action is delayed; the vehicle pulls to one side when the brake pedal is pressed.
Q. The distance that you should look ahead of your vehicle while driving amounts to about ___ at highway speed.
Ans: 1/4 mile.
Q. Which of these statements about drinking alcohol is true?
Ans: (all) alcohol first affects judgment and self-control, which are essential for safe driving; Statistics show that drivers who have been drinking have a much greater chance of being in a crash; A driver can lose their license for driving while under the influence of alcohol.
Q. On which fires can you use the “ABC” fire extinguisher?
Ans: (all) Electrical fires; Burning tires; Burning cloth.
Q. Which of these is a proper use of vehicle lights and flashers?
Ans: (all) Flashing your brake lights to warn someone behind you of a hazard that will require slowing down; Turning on your headlights during the day when visibility is reduced due to rain or snow; Flashing your brake lights to warn someone behind you that you’re going to stop on the road.
Q. According to the Handbook, children present a hazard because
Ans: they move quickly without checking traffic
Q. Which of these tell you that cargo contains hazardous materials?
Ans: a four-inch, diamond shaped hazardous materials label on the container and A hazardous materials placard on the vehicle.
Q. 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:
Ans: At least a one year suspension of your CDL.
Q. Some liquid tanks are divided into several smaller tanks by:
Q. Front-end header boards:
Ans: (both correct) Block the forward movement of your cargo; Protect you from your cargo in case of collision.
Q. The height of the vehicle center of gravity is very important for safe handling. A high center of gravity means you are ore likely to do the following:
Q. The “load” means the following?
Ans: The maximum safe weight a tire can carry at a specified pressure.
Q. Whether or not you load and secure your load yourself, you are responsible for:
Ans: (all) Knowing your cargo is securely tied-down and covered; Recognizing overloads and poorly balanced weight; Inspecting your cargo.
Q. Which of these statements about downshifting for a long downhill grade is true?
Ans: It allows engine compression and friction to help the brakes slow the vehicle.
Q. Medical certificates must be renewed every:
Ans: 2 years.
Q. During a pre-trip inspection you discover an exhaust leak or power steering leak, you should:
Ans: Report the problem and make arrangements for another vehicle to use.
Q. During what time in your pre-trip inspection of a school bus do you check the back emergency door? (to ensure it is closed.)
Ans: During step four (lights first half) the inside walk through.
Q. Inspect your cargo after you have driven:
Ans: 25 miles or 50 miles depending on the law in the state you are in, then again after 3 hours or after you have driven 150 miles and after every stop for a break.
Q. Axle weight means the following?
Ans: The weight transmitted to the ground by one axle or one set of axles.
Q. Blocking your cargo to keep it from sliding must be done at the:
Ans: used in front, back, and/or sides of a piece of cargo.
Q. Over-length, over-width, and/or overweight loads require:
Ans: (all) Flashing lights; Driving limited to certain times; Special transit permits.
Q. Turn signals should be used:
Ans: At least 100 feet before turning or changing lanes.
Q. Which of these statements about speed management is true?
Ans: (all) On a wet road, you should reduce your speed by about 1/3; On packed snow, you should reduce your speed by about 1/2; When the road is slippery, it will take longer to stop and it will be harder to turn without skidding.
Q. At what speed should you test the stopping action of the service brakes?
Ans: 5 mph
Q. You are driving on a straight, level highway at 50 mph. There are no vehicles in front of you. Suddenly a tire blows out on your Ans: vehicle. What should you do first?
Stay off the brake until the vehicle slows down on its own.
Q. Which of these will help keep an engine cool in hot weather?
Ans: (all) Making sure the engine has the right amount of oil; Properly adjusted v-belts; Avoiding high speed driving.
Q. When a vehicle is carrying a load at night, which extends four feet or more beyond the rear of the body, there must be _ at Ans: the extreme end of the load.
Q. When checking the bus seats, what are you looking for?
Ans: (all) To insure they are securely fastened to the bus; To see if they have been removed; To insure the seat and back portions are not loose.
Q. You must inspect your cargo:
Ans: (all) After every break; Every 3 hours or 150 miles; Before starting.
Q. Tie downs must be of the proper type of strength. The combined strength of cargo tie downs must be strong enough to lift:
Ans: One and one-half times the weight of the cargo tied-down.
Q. Which of these is important to check before driving in the winter?
Q. Tank vehicles are used to carry liquid and are dangerous to drive because:
Ans: (all) Danger of load surge; High center of gravity; Shifting of the load occurs.
Q. Flags or lights are required on projecting loads that extend
Ans: 4 or more feet beyond the rear body
Q. Prior to driving, what are some of the items you should check the interior of the bus for?
Ans: (all) School books and student belongings; A student or other passengers; Trash and clothing.
Q. How far can the board of education make a student walk to their assigned pick up location?
Ans: 1/2 mile.
Q. There are three types of vehicle inspections, which of these is one of them?
Ans: (all) Post-trip; En-route; Pre-trip
Q. You are checking your brakes and suspension system for a pre-trip inspection. Which of these statements is true?
Ans: (all) Brake pads should not have brake fluid on them; One missing leaf in a a leaf spring can be dangerous; Brake shoes should be at least 1/32 inch thick.
Q. You must park on the side of a level, straight, four lane, divided highway. Where should you place the three reflective triangles?
Ans: One within 10 feet of the rear of the vehicle, one about 100 feet to the rear, and one about 200 feet to the rear.
Q. Which of these is a good driving rule for work zones?
Ans: (all) Turn on you flashers/hazard lights; Use your brake lights to warn drivers behind you; Drive slowly.
Q. Under loaded front axles can cause the following:
Ans: (all) Too much play in the steering wheel; Poor traction; Damage to the tires.
Q. Dry bulk tanks require special care because:
Ans: (all) The load can shift; They have a high center of gravity.
Q. Overloading can have a bad effect on?
Ans: (all) Speed control; Steering; Braking.
Q. No matter how small the cargo is, it should have at least:
Ans: 2 tie downs
Q. As part of your pre-trip inspection you must:
Ans: (all) Check for poorly balanced weight; Check if cargo is secured; Check for overloads.
Q. Which item lists almost all or all the emergency equipment that is required on a school bus?
Ans: A fire extinguisher, fusees, electrical fuses (if your vehicle uses them), a crow bar, emergency triangles, and a first aid kit (with an emergency medical card for each student inside the first aid kit).
Q. When backing your vehicle, which of the following is NOT recommended
Ans: Back towards the right side
Q. Cargo that is not loaded or secured properly can cause many problems. Which of these statements is true?
Ans: (all) Other highway users can hit or be hit by loose cargo; Loose cargo can cause injury to the driver or passengers during a quick stop or crash; Overloading can damage vehicle.
Q. You must drive on a slippery road. Which of these is a good thing to do in such a situation?
Ans: Slow down gradually.
Q. Brake “fade”:
Ans: Can be caused by the brakes becoming too hot.
Q. The biggest problem with a broken exhaust system is that it may let poison fumes into the vehicle’s cab:
Q. What is the most important reason for doing a vehicle inspection?
Ans: Safety for your self and other road users.
Q. You should have a minimum of _ tread on your steering tires.
Ans: 4/32 inch
Q. When taking a break in the middle of your trip you should check:
Ans: Critical items such as: tires, brakes, and cargo tie-downs.
Q. Which of these is correct regarding brake shoes:
Ans: Brake shoes should not be worn dangerously thin.
Q. What items should be checked for safety on the steering column?
Ans: Steering arms should not have missing nut, bolts or cotter keys.
Q. Measuring BAC (Blood Alcohol Concentration) is done by measuring a person’s:
Ans: Body weight
Q. You truck has a dual air system and one of the systems loses its pressure. What will happen?
Ans: Either the front or back brake will not fully be operational.
Q. When getting in to start the engine and inspect inside the vab you must:
Ans: (both) Make sure the parking brake is on and put the gearshift in neutral (or park if automatic); Start the engine and listen for unusual noises.
Q. When preparing to do a pre-trip inspection yo must check to see that the parking brakes are in and/or chocked.
Q. It is important for driving safety to always be looking ahead. Which of the following is NOT a recommended time/distance that you should be looking ahead?
Ans: About 5 car lengths on the highway
Q. The oil pressure gauge should come up to normal within how long after starting the engine?
Q. You should check the following for looseness, sticking, damage, or improper settings:
Ans: (both) Steering wheel and Transmission controls; Accelerator, brakes, and clutch pedals.
Q. After inspecting mirrors and windshields for cracks, dirt, and illegal stickers, or other obstructions to your vision, you should:
Ans: Clean and adjust as necessary.
Q. When checking lights you should:
Ans: (all) Make sure that the parking brake is set; Turn off the engine and take the key with you; Turn on the headlights and four way flashers.
Q. What should the wheel bearing seals be checked for?
Ans: Hub oil level and no leaks.
Q. How many red reflective triangles should you carry?
Q. How do you test the hydraulic brakes for leaks?
Ans: Pump the brake pedal three times, then apply firm pressure to the pedal and hold for five seconds. The pedal should not move.
Q. Why put the starter key in your pocket during the pre-trip inspection?
Ans: For your safety.
Q. You are driving a 40-foot truck at 35 MPH, how much space (in seconds) should you keep in front of you?
Ans: 4 seconds
Q. To avoid rollbacks when you start, you should:
Ans: Partly engage the clutch before you take your right foot off the brake.
Q. What is the proper way to hold the steering wheel?
Ans: Firmly with both hands on opposite sides of the wheel.
Q. Why should you back towards the driver’s side?
Ans: (both) Backing toward the right side is dangerous; So you can see better.
Q. When backing, why is it important to use a helper?
Ans: There are blind spots you can’t see.
Q. What is the most important hand signal you and your backing helper should agree on?
Q. What are two special occasions where you should downshift?
Ans: Before starting down a hill and before entering a curve.
Q. When should you downshift automatic transmissions?
Ans: When going down grades.
Q. Retarders keep you from skidding where the road is slippery.
Q. The act of operating a motor vehicle in a selfish, bold, or pushy manner, without regard for the rights or safety of others is known as?
Ans: Aggressive driving
Q. What are two ways to know when to shift?
Ans: Use engine speed (rpm) and use road speed (mph).
Q. How far ahead should you look?
Ans: 12-15 seconds
Q. What are the two main things to look for ahead?
Ans: Traffic and road conditions
Q. What is your most valuable way to see the sides and the rear?
Ans: Checking your mirrors regularly.
Q. What does “communicating” mean in safe driving?
Ans: Letting other drivers know you’re there to help prevent crashes.
Q. If you go twice as fast your stopping distance will increase by:
Ans: Four times
Q. Empty trucks have the best braking.
Q. What is hydroplaning?
Ans: When the tires lose their contact with the road.
Q. What is black ice?
Ans: A thin layer of ice clear enough that you can see the road underneath it
Q. If the vehicle in front of you is smaller than yours, it can probably:
Ans: Stop faster than you.
Q. If you are driving a 30 foot vehicle at 55 mph, how many seconds of following distance should you allow?
Ans: 4 seconds
Q. If you swing wide to the left before turning right another driver may try to pass you on your right.
Q. You should use low beams whenever you can.
Q. What should you do before driving if you are sleepy?
Ans: Get some sleep before you drive.
Q. What effects can wet brakes cause?
Ans: Brakes can be weak or grab.
Q. How can you avoid wet brake problems?
Ans: Slow down, shift to a low gear, gently put on the brakes.
Q. You should let air out of hot tires so the pressure goes back to normal.
Q. You can safely remove the radiator cap as long as the engine isn’t overheated.
Q. What factors determine your selection of “safe” speed when going down a long steep downgrade?
Ans: Total weight of the vehicle, length of the grade, steepness, road conditions, and weather.
Q. Why should you be in proper gear before starting down a hill?
Ans: Because gravity can cause the speed of your vehicle to increase.
Q. What is a hazard?
Ans: Any road condition or other road user that is a possible danger.
Q. Why make emergency plans when you see a hazard?
Ans: In order to protect yourself and others.
Q. What are some advantages of going right instead of left around an obstacle?
Ans: (all) You can avoid a head-on collision; Taking the shoulder may be best; Someone may be passing to the left.
Q. Stopping isn’t always the safest thing to do in an emergency.
Q. What is an “escape ramp”?
Ans: Ramps that are located a few miles from the top of a downgrade to help you stop.
Q. What are some things to do at an accident scene to prevent another accident?
Ans: (all) Try to get your vehicle to the side of the road; If you’re stopping to help, park away from the accident; Put on your flashers and set out reflective triangles.
Q. Name two causes of fires:
Ans: Under-inflated tires and duals that touch.
Q. Which of these can cause the vehicle to skid?
Ans: (all) Not enough weight on the front axle; OVer acceleration; Turning too sharply.
Q. 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 Ans: speed limit is 55. The safest speed for your vehicle in this situation is most likely:
Q. Every time you park your vehicle and shit the engine off you should:
Ans: Apply the parking brake.
Q. For an average commercial vehicle being driven at 55 mph on dry pavement it will take about _ to bring the vehicle to a stop.
Ans: The length of a football field (300 feet).
Q. Which of these statements about certain types of cargo is true?
Ans: Unstable loads such as hanging meat or livestock require extra caution on curves.
Q. Which of the statements about backing is true?
Ans: (all) Backing is always dangerous; You should back and turn towards the driver’s side whenever possible; You should use a helper to communicate with hand signals.
Q. The most common cause of serious vehicle skids is:
Ans: Driving too fast for road conditions.
Q. The parking brake should be tested while the vehicle is:
Ans: Moving forward slowly.
Q. A driver’s trip log if required:
Ans: Must be shown immediately when an officer requests it.
Q. When should the pre-trip inspection report from the last driver be reviewed?
Ans: During your pre-trip inspection.
Q. If you are stopped at a rest area and found to have a BAC (Blood Alcohol Concentration) of .02 you will:
Ans: Be placed out of service for 24 hours.
Q. How far ahead should you be looking while driving in town?
Ans: 1 block
Q. How does “bleeding tar” effect the road surface and driving conditions?
Ans: Tar in the road pavement rises to the road surface in very hot weather causing the roads to become very slippery.
Q. Converter dollies built on or after March 1, 1998 are required to have anti-lock brakes. These dollies will have:
Ans: A yellow malfunction lamp on the left side of the dolly.
Q. What is the minimum length for mud flaps?
Ans: Within 8 inches of the surface of the road.
Q. How long does it take a typical tractor trailer to clear a single track? A double track?
Ans: It takes 14 seconds to clear a single track, and more than 15 seconds to clear a double track.
Q. What is the definition of “sleep debt”?
Ans: The cumulative effect of not getting enough sleep.
Q. Name some important steering system parts:
Ans: The rod, spindle, and pitman arm.
Q. What is the minimum tread depth for front tires?
Ans: 4/32 inch
Q. When using your fire extinguisher you should get as close to the fire as possible.
Q. Name some things you should check on the FRONT of your vehicle during your pre-trip inspection:
Ans: Low beams, high beams, four way flashers, and turn signals.
Q. Why are placards used?
Ans: To communicate risk
Q. Name some suspension system defects:
Ans: (both) Broken leaves in leaf spring and cracked or broken spring hanger; Leaking shock absorbers.
Q. What is the minimum tread depth for tires other than front tires?
Ans: 2/32 inch
Q. How can you avoid the effects that wet brakes can cause?
Ans: (all) Slow down and place the transmission in low gear; Gently put on brakes and increase engine rpm, cross the water while keeping light pressure on the brakes; When out of water maintain light pressure on the brakes for a short distance.
Q. What things should you check during a trip?
Ans: Watch gauges, mirrors, and use your senses to check for problems…LOOK, LISTEN, AND SMELL.
Q. Why should you be in the proper gear before starting down a hill?
Ans: You will not be able to shift into a lower gear once you are going down a hill.
Q. What is an advantage of going right instead of left around an obstacle?
Ans: If you are blocked on both sides, a move to the right won’t force anybody into opposing traffic lane and a possible head-on collision.
Q. Name two situations when legal maximum weights may not be safe to haul:
Ans: During bad weather or in mountains.
Q. What three things related to cargo are the driver’s responsibility?
Ans: Inspecting the cargo, recognizing overloads, and properly securing the cargo.
Q. What is a hazardous materials placard?
Ans: Signs put on the outside of a vehicle which identify the hazard class of the cargo.
Q. What must you check before transporting a sealed load?
Ans: That the load is properly secured.
Q. How do you calculate how many seconds of following distance space you have?
Ans: Wait until the vehicle ahead of you passes a clear landmark, then count off the seconds until you reach the same spot.
Q. What is a “pull-up”?
Ans: Pulling forward while backing a trailer to reposition it.
Q. What should wheel bearing seals be checked for?
Q. Select the proper collision procedures that are required for any collision that you are involved in ; in which you are not seriously injured.
Ans: (all) Protect the area; Notify authorities; Care for the injured; Collect required information; Report the collision.
Q. What must you do if you are involved in a collision that involves death, injury, or property damage over $1,000?
Ans: File an official report on form SR-1 within 10 days
Q. The tendency for long commercial vehicles to swing wide on turns in called:
Q. What should you do if you get stuck on the railroad tracks?
Ans: Get out of your vehicle and away from the tracks.
Q. An antilock braking system (ABS) will
Ans: not change the way you brake normally
Q. Which of these is a good thing to remember about drinking alcohol?
Ans: Alcohol first affects judgment and self-control.
Q. Which of these statements is true about medicines used to treat the common cold?
Ans: It often makes you sleepy thus should not be used while driving.
Q. The total weight of the powered unit, the trailer, and the cargo is called:
Ans: Gross combination weight.
Q. Your safety equipment must include
Ans: three red reflective triangles to be used as warning devices
Q. Which piece of emergency equipment should be in your vehicle?
Ans: Warning devices for parked vehicles.
Q. Which of these statements is true about causes of vehicle fires?
Ans: Poor trailer ventilation can cause flammable cargo to catch on fire.
Q. Which of these statements is true about vehicle fires?
Ans: A burning tire should be cooled with water.
Q. Legal maximum weight limits may not be safe in all of the following, EXCEPT
Q. Which of these statements is true about brakes?
Ans: Brakes absorb more heat to stop heavier vehicles.
Q. Which of the following does not provide extra gears on some trucks?
Ans: Automatic transmissions.
Q. Which of these is not a danger when an automatic transmission is forces into lower gear at a high speed?
Ans: Loss of steering control
Q. Which of these statements is true about backing heavy vehicles?
Ans: You should avoid backing whenever you can.
Q. The distance you should look ahead _ while driving at highway speeds.
Ans: 1/4 mile.
Q. The Commercial Driver’s Handbook suggests several things to do when you pass a vehicle. Which of these is NOT one them?
Ans: At night, turn on your high beams while you pass the vehicle.
Q. Which of these statements is true about speed management?
Ans: On slippery roads, it takes longer to stop and is harder to turn without skidding.
Q. You are driving a heavy vehicle and must exit a highway using an off ramp that curves downhill. You should:
Ans: Slow down to a safe speed before taking the curve.
Q. Which of these is a good thing to do when driving at night?
Ans: Drive slowly enough to stop within the range of your headlights.
Q. Which of these is NOT something you should do if your headlights are not working properly?
Ans: Leave your high beams on.
Q. When roads are slippery you should:
Ans: Make turns as carefully as possible.
Q. You should avoid driving through deep puddles or flowing water but if you cannot, which of these steps can help keep your brakes working?
Ans: Gently putting on the brakes while driving through the water.
Q. Which of these is true about the radiator shutters and the winterfront?
Ans: You should remove ice from the radiator shutters.
Q. Which of these statements is NOT true about engine belts in hot weather?
Ans: Cracking is likely to occur but it is not a safety threat.
Q. What should you do if you see a hazard in the roadway?
Ans: Use your 4-way flashers or brake lights to warn others.
Q. A car suddenly “cuts” in front of you creating a hazard. What should you NOT do?
Ans: Honk and stay close behind the car.
Q. Your vehicle has hydraulic brakes. When traveling on a level road, you press the brake pedal and find that it goes to the floor. Which of these statements is true?
Ans: Pumping the brake will generate enough pressure to stop the vehicle.
Q. Bridge formulas permit:
Ans: Less maximum axle weight for axles that are close together.
Q. You are checking your steering and exhaust systems in your pre-trip inspection. Which of these problems should be fixed before the vehicle is driven?
Ans: Steering play-more than 10% (2 inches on a 20 inch wheel).
Q. Which of these items is NOT checked on a pre-trip inspection?
Ans: Amount of fuel in the vehicle.
Q. One can recognize hazardous materials by looking at the container’s:
Q. If you must stop on a hill in a two-way, two-lane road. How far back should you place your reflective triangles?
Ans: Within 500 feet behind the vehicle.
Q. Which of these is true about hours of service?
Ans: You should balance your hours of service with enough sleep to keep you alert.
Q. You should try to park your vehicle so:
Ans: You can pull forward when you leave.
Q. Which of these is NOT a proper use of vehicle lights?
Ans: Flashing your brake lights to stop someone from tailgating.
Q. Which of the following in NOT a type of retarder?
Q. What is the first thing you should try to do if your brakes fail while driving downhill?
Ans: Get off the road as soon as possible.
Q. When you drive in the mountains, you will have to use lower gears to drive safely down grades. Which of these does NOT affect your choice of gears?
Ans: Tire tread type
Q. Which of these in NOT caused by rough acceleration?
Ans: Tire damage
Q. Which of the following statements is true?
Ans: Many heavy vehicle accidents occur between midnight and 6 am.
Q. Which of the following may be a sign of tire failure?
Ans: Wheels fishtailing.
Q. Which of these statements is NOT true?
Ans: A drinker can control how fast his or her body absorbs and gets rid of alcohol.
Q. Optional safety equipment may include emergency phone numbers, tire chains and:
Ans: Tire changing equipment
Q. The braking effect of the engine is the greatest when the engine is _ the governed RPM’s and the transmission is in the __ gears.
Ans: Near, lower.
Q. The best drivers are those who watch and prepare for hazards. This is called being:
Q. Which of these is not a possible penalty for having more than one license?
Ans: warning for a first offense
Q. Which of these will cause you to lose your CDL for a minimum of one year for the first offense?
-Driving a commercial motor vehicle (CMV) when your blood alcohol content (BAC) is .04% or higher
-Committing a felony that involves your use of a CMV
-Refusing to undergo blood alcohol testing when asked to do so.
Q. What is the safest speed when you are driving in heavy traffic?
Ans: The speed of other traffic (if not illegal or safe)
Q. What will help keep an engine cool in hot weather?
Ans: Making sure the engine has the right amount of oil.
Q. Which of these statements is true regarding the use of drugs while driving?
Ans: Prescription drugs are allowed as long as the doctor says the drugs will not affect safe driving ability.
Q. Which of these statements is true about warning other drivers of a stopped vehicle?
Ans: Move the rear reflective triangle back if the driver’s vision is obscured to within 500 feet.
Q. If you have a heavy load that is slowing you down on an upgrade you should:
Ans: Shift into a lower gear.
Q. Which of these statements is NOT true about backing a heavy vehicle?
Ans: You should back slowly until you slightly bump into the dock.
Q. In your mirror you see a car approaching from the rear. The next time you check your mirror you don’t see the car. To change lanes you should:
Ans: Wait until you are sure the car isn’t in your blind spot.
Q. What should you do if a car coming towards you at night keeps it’s high beams on?
Ans: Look to the right edge of your lane or the right edge of the road.
Q. Which of these is especially true about your tires in hot weather?
Ans: You should check tire mounting and air pressure before driving?
Q. When driving through roadway work zones, you should:
Ans: Watch for sharp pavement drop-offs.
Q. Which of these statements is true about bad weather driving conditions?
Ans: When the temperature drops, bridges will freeze before roadways.
Q. Which of these statements is true about other drivers?
Ans: Short-term or daily rental truck drivers are often not used to the limited vision and pose a hazard.
Q. Which of these will happen if a tire blows out at highway speeds?
Ans: A vibrating feeling.
Q. To prevent “brake fade” you should:
Ans: Select a gear that will keep your vehicle to a safe speed on steep downgrades.
Q. If you have been drinking alcohol, before you drive, you should:
Ans: Wait for it to wear off.
Q. Which of the following best describes how sleep debt can be paid off?
Ans: It can only be paid off sleeping.
Q. Which of these statements is true about drugs?
Ans: The use of alcohol or drugs can lead to collision and/or arrest.
Q. “Implied consent” means when you sign the driver’s license application form, you:
Ans: Give your consent to be tested for alcohol in your blood.
Q. You should use your mirrors to check:
Ans: Where the rear of your vehicle is while you make turns.
Q. The purpose of retarders is:
Ans: Help slow the vehicle while driving and reduce brake wear.
Q. It is important to shift gears correctly to keep:
Ans: Control of the vehicle.
Q. A helper should be used to help back your vehicle:
Ans: Whenever possible.
Q. You should signal continuously while turning because:
Ans: You need both hands on the wheel to turn safely.
Q. When approaching a traffic light that has been green for a long time, you should:
Ans: Start to slow down so you will be ready to stop.
Q. What three things add up to total stopping distance for your truck or bus?
Ans: Perception distance, reaction distance, braking distance.
Q. If you cannot see well with your headlights when driving in an area with few streetlights on a clear night, you should:
Ans: Use your high beams when legal and keep your interior light off.
Q. When driving at night, use your low beams, when an oncoming vehicle is within:
Ans: 500 feet
Q. If your brakes get wet while driving on a rainy day, what can happen when you apply the brakes?
Ans: Trailer Jackknife
Q. Which of these is a danger of crossing railroad tracks on dirt roads?
Ans: You could get hung up halfway across the tracks.
Q. A key principle to remember about loading cargo is to keep the load:
Ans: Balanced in the cargo area.
Q. Can federal inspectors inspect your truck or bus?
Ans: Yes, and they can place it out of service.
Q. Which of these is NOT required knowledge for drivers needing HAZMAT endorsement?
Ans: Basic chemistry.
Q. When driving on grades, which of these is the best choice for a safe speed?
Ans: Based on your vehicle and it’s cargo, select a speed that is safe within the posted limit.
Q. Which of these should you NOT do during a drive wheel skid?
Ans: Steer into the skid
Q. Trucks and buses are subject to certain laws, restrictions, and regulations. Which of these statements is true?
Ans: Laws and restrictions can vary from place to place.
Q. When you are passing another vehicle, pedestrian, or bicyclist you should assume they:
Ans: May move into your traffic lane.
Q. Within how many days must you notify your employer of any traffic violations (except parking)?
Q. Which of the following cannot be checked at the same time:
Ans: Brake lights, flashers, and turn signals.
California CDL General Knowledge Test Questions and Answers – Definitions
Q. Cargo inspections:
Ans: 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.
Ans: Can cause the drive wheels to skid when they have poor traction.
Q. Cargo covers:
Ans: (both are correct) Protect people from spilled cargo; May be a safety requirement in some states.
Q. Stab braking:
Ans: Involves releasing the brakes only after the wheels lock up.
Q. Controlled braking:
Ans: Is used to keep a vehicle in a straight line when braking.
Q. Containerized loads:
Ans: Are generally used for freight carried part way by rail or ship.
Q. Convex curved mirrors:
Ans: Show a wider area than flat mirrors.
Ans: Is more likely if tire pressure is low.
Q. Gross Vehicle Weight (GVW):
Ans: The total weight of a single vehicle and its load.
About California CDL General Knowledge Test
The California CDL General Knowledge Test is a requirement for all commercial truck drivers who wish to obtain their California Commercial Driver’s License (CDL).
The test covers important topics that all truck drivers should know, such as road signs, rules of the road, and basic vehicle maintenance.
By taking the test and passing it with a score of 80% or higher, you will demonstrate your knowledge of these topics and show that you are ready to become a safe and responsible truck driver in California.
Hope you got access to California CDL Test General Knowledge Questions and Answers by following to above what we shared. Share with other students if you find it helpful.