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California CDL DMV Knowledge Test Class A 2

Take 6 practice tests for CDL is the best way to prepare for your California DMV exam is by taking our free practice tests. The following question are from real California DMV practice test. More than 95% people pass a DMV exam when practice at DMV Practice Test.

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1. You may not consume alcohol within ____ of going on duty.
One hour
Two hours
Four hours

Commercial vehicle drivers are prohibited from consuming any intoxicating beverage, regardless of its alcohol content, within four hours of going on duty.

2. Poor weight balance:
Improves handling.
Can negatively affect handling.
Will reduce fuel consumption.

Poorly balanced cargo can cause a vehicle to be difficult to handle. Keep weight distribution in mind when loading cargo.

3. Do not operate a vehicle if any brake drums have cracks that are larger than ____ of the width of the friction area.
One half
One third
One fifth

Before beginning a trip, it is important to check the brake drums during your walk-around inspection. It is unsafe to drive if any brake drum has a crack more than one half of the width of the friction area.

4. The radiator cap:
Should not be removed when the coolant is hot.
Can be removed when the coolant is hot.
Should be cool to the touch under normal driving conditions.

Never remove the radiator cap or any part of the pressurized cooling system until it has cooled. Opening the cap while the system is too hot could release steam and boiling water that could severely burn you. If the radiator cap is cool to the touch, the system is likely cool enough for you to open the cap.

5. How should you brake if your vehicle's ABS is not working?
Brake normally, as you will still have functioning brakes.
Pump the brake repeatedly.
Press the brake pedal down as hard as you can.

Without a working Anti-Lock Braking System (ABS), your vehicle will still have normal brake function. Continue to drive and brake as you normally would and have your ABS serviced as soon as possible.

6. When should a driver sign a vehicle inspection report?
After every trip
If noted defects are repaired
After each fueling

You must sign a vehicle inspection report only if defects were noted and either certified to have been repaired or certified as not needing to be repaired.

7. Poor weight balance:
Improves handling.
Makes handling more difficult.
Increases a driver’s ability to steer.

Poorly balanced loads can lead to unsafe handling. It is important to properly distribute the weight of cargo when loading a vehicle.

8. During an applied leakage test, the maximum leakage rate for a double combination vehicle is ____ in a minute.
2 psi
4 psi
6 psi

It is important to know the maximum air loss rate that is safe for your specific vehicle. A double combination vehicle should have a leakage rate no higher than 4 psi in a minute during an applied leakage test.

9. A person driving with an open window in cold weather may be:
A distracted driver.
A person who is dressed inappropriately.
A person who likes fresh air.

It is important to observe other drivers' actions and identify clues that a person could be driving impaired. Drivers who have had too much to drink, are sleepy, are on drugs, or are ill can present hazards to other drivers. One sign that a driver may be impaired is that they have their windows rolled down in cold weather.

10. What is removed when an air tank is drained?
Water and oil
Liquid cleaners

In an air brake system, air tanks have drains to remove accumulations of water and compressor oil. Allowing water and oil to accumulate in the system could cause damage to the brakes.

11. The ____ tells a driver how much pressure is in the air tanks.
Application pressure gauge
Air compressor governor
Supply pressure gauge
Drum brake

A vehicle that is equipped with air brakes must also be equipped with a supply pressure gauge. This gauge tells the driver how much air pressure is in each of the vehicle's air tanks.

12. Containerized loads are used:
When the cargo is too large to fit on a truck.
When the cargo has been or will be transported by a train.
When the cargo is a liquid.

Containerized loads are generally used when freight is carried partway by rail or ship. Sealed materials cannot be inspected, but a driver should ensure that the containers do not exceed safe and legal weight limits.

13. If being tailgated, you should:
Increase your speed.
Increase the amount of space between your vehicle and the vehicle in front of you.
Make quick movements.

If you are being tailgated, you should increase the distance between your vehicle and the vehicle ahead of you. This reduces the need for you to make sudden changes in speed or direction while making it easier for the tailgater to pass your vehicle.

14. Violation points for major violations are retained on a driving record for:
Three years.
10 years.
55 years.

Points for major violations that occur while driving a commercial motor vehicle, or while you are a CDL holder, will be retained on your record for 55 years.

15. When completing a driver's side parallel parking maneuver, you should:
Pull forward directly into the parking space.
Back up past the parking space, then pull forward into it.
Pull forward past the parking space, then back into it.

You may be asked to complete a parallel parking maneuver into a parking space that is to the left of your vehicle. You should drive past the parking space before backing into it while bringing the rear of your vehicle as close to the rear of the space as possible. Your vehicle should be completely within the boundaries of the space.

16. While operating on a downgrade, you should brake until you reach a speed that is:
5 mph below your safe speed.
10 mph below your safe speed.
15 mph below your safe speed.

While driving downhill, you should hold down the brake pedal until your vehicle reaches a speed 5 mph below your safe speed, then release the brake pedal. Repeat this process.

17. If unable to tell if the road is becoming icy and slippery, a driver:
Should try guessing.
May open their window and feel the front of the side mirror for ice.
Should look at the road closely.

If you think the road surface may be becoming icy but you are not certain, you can open your window and feel the front of the side mirror, mirror support, or antenna. If ice has formed on any of these items, the road is likely becoming icy as well.

18. When parking, you should not use the parking brake if:
The brakes are very hot.
The brakes are very cold.
There is snow on the ground.

If your brakes are hot after coming down a steep grade, you should not use your parking brake when parking. Let your brakes cool before applying the parking brake or risk damaging the brakes.

19. To prevent a vehicle from rolling backward when beginning to move forward from a stopped position, you should:
Turn off the engine.
Partly engage the clutch.
Apply the emergency brake.

To prevent a vehicle with manual transmission from rolling backward when you begin to move forward from a stopped position, you can partly engage the clutch before removing your foot from the brake pedal.

20. During a basic vehicle control skills test, a look is when:
A driver checks the gauges on their instrument panel.
A driver checks their blind spots.
A driver walks to the back of their vehicle to check its position.

A driver uses a look when they open their door, leave their seated position, and walk to the back of the vehicle to check its position. During the straight line backing exercise, a driver may not exceed one look. During any other exercise, a driver may not exceed two looks.

21. Having ABS on only one axle:
Can be dangerous.
Still allows you additional control when braking.
Slows the vehicle, but cannot stop it.

If you have an Anti-Lock Braking System (ABS) equipped on only the tractor, only the trailer, or only one axle, you will still have more control over the vehicle when braking than you would without ABS. You should brake normally.

22. If the spring brakes are on, you should:
Not use the brake pedal.
Press the accelerator.
Move the steering wheel.

Do not use the brake pedal when the spring brakes are on. This could damage the brakes by subjecting them to the combined forces of springs and air pressure.

23. What is road rage?
Operating a motor vehicle with the intent of doing harm to others
Operating a motor vehicle that is deemed unsafe
Operating a motor vehicle that has not been inspected

Aggressive driving is defined as operating a motor vehicle in a selfish, bold, or pushy manner. Road rage is defined as operating a motor vehicle with the intent of doing harm to others, or the intent of physically assaulting another driver or their vehicle.

24. A modulating control valve can control the:
Spring brakes.
Landing gear.
Air brakes.

A modulating control valve allows a driver to gradually apply spring brakes. In equipped vehicles, the valve is controlled by a lever located on the dashboard.

25. Vehicles equipped with Anti-Lock Braking Systems (ABS) have ____ malfunction lamps to indicate when the ABS is not working.

Vehicles with ABS have yellow malfunction lamps to alert drivers when the braking systems are not working. Be sure you know where the malfunction lamp on your vehicle is before beginning a trip.

26. Talking on a cell phone while driving removes about ____ of a person's focus from the task of driving.
10 percent
39 percent
82 percent

Distracted driving is always dangerous. Talking on a cell phone takes away about 39 percent of a person's mental energy that would otherwise be devoted to driving.

27. If turning to avoid a hazard:
You should brake hard.
You should not brake as it may cause the wheels to lock.
You should turn very sharply.

You should not brake while making a quick turn to avoid a hazard. Doing so could cause your wheels to lock and make your vehicle skid out of control.

28. When adjusting your mirrors before a trip:
No part of your vehicle should be visible in any mirror.
Part of your vehicle should be visible in the mirrors.
More than half of each mirror should show the vehicle.

When properly adjusted, your mirrors should each display some part of your vehicle. Being able to see your own vehicle in your mirrors will give you a point of reference when judging the positions of other objects.

29. When traveling down a steep grade, you switch into a lower gear:
Before beginning the grade.
When you have already started the grade.
As far down the grade as possible.

You should shift your vehicle's transmission into a low gear before staring a downhill grade. Be prepared for gravity to increase your vehicle's speed when traveling downhill.

30. Braking mechanisms are located inside:
The fifth wheel.
A brake drum.
The landing gear.

Drum brakes are attached to the wheels and located on the axles of a vehicle. The braking mechanisms that cause the vehicle to stop can be found inside of a drum brake.

31. Driving with a cargo of hanging meat in a trailer:
Is discouraged during the summer months.
Can be problematic because animals are attracted to the smell of the meat.
Is challenging because the load has a high center of gravity.

An operator should drive with care when transporting a cargo of hanging meat. Such a load is unstable, both because it has a high center of gravity and because the swinging of the meat can affect the driver's handling of the vehicle.

32. Mirror adjustment can only be checked properly if:
The trailer is straight.
There is no trailer.
The vehicle is on a slight incline.

On a vehicle with one or more trailers, mirror adjustment can only be checked accurately if the trailers are straight. Mirror adjustment should be checked before the start of every trip.

33. You should maintain at least ____ of following distance per every 10 feet of your vehicle when you are traveling more slowly than 40 mph.
One second
Two seconds
Three seconds

At speeds below 40 mph, you should allow at least one second of following distance for every 10 feet of your vehicle. Follow the same formula when traveling at faster speeds, then add one additional second to your following distance. Remember that larger vehicles require more space to stop than smaller vehicles.

34. How can you check for a leak in hydraulic brakes?
Pump the brake pedal three times, then hold down the pedal for five seconds. If the pedal moves, there may be a problem.
Push the brake pedal down as far as possible and release. If the brake pedal returns to its normal position, there may be a problem.
Push the brake pedal down as far as possible and release. If the brake squeaks, there may be a problem.

Check hydraulic brakes by pumping the brake pedal three times before applying firm pressure to the pedal for five seconds. The pedal should not move. If it does, there may be a leak or some other problem in the braking system.

35. A tread depth of ____ should be in every major groove of a tire that is not in the front of a commercial motor vehicle.
1/32 of an inch
2/32 of an inch
4/32 of an inch

For safe operation, a commercial motor vehicle needs a tread depth of 4/32 of an inch in every major groove on the front tires, and a tread depth of 2/32 of an inch on other tires.

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