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Driving Test
California
California CDL Knowledge Test Class B 1
Answers
Q.1.
You may not consume alcohol within ____ of going on duty.
One hour
Two hours
Four hours
Q.2.
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
Q.3.
Why do large vehicles use air brakes?
Other brake systems squeak too loudly.
Air brakes are very effective systems.
Other braking systems are hard to come by.
Q.4.
When backing with a trailer, you should begin by:
Turning the steering wheel in the direction of the turn.
Turning the steering wheel in the direction opposite of the turn.
Turning the wheel as sharply as possible.
Q.5.
While driving downhill, you should brake until you reach a speed that is ____ below your safe speed, then release the brake pedal.
5 mph
10 mph
15 mph
Q.6.
When backing with a trailer:
You should not back up in a straight line.
You should not correct drift until you are far off course.
You should frequently pull forward to reposition the vehicle.
Q.7.
If involved in an accident, which of the following is not recommended?
Trying to move your vehicle to the side of the road
Caring for the injured
Driving away from the scene
Q.8.
When leaving your vehicle:
The air brakes should be applied.
The parking brake should be applied.
Brakes should not be applied if the vehicle is left out of gear.
Q.9.
When backing up, follow a turning trailer by:
Changing nothing. The vehicle will naturally follow the trailer.
Changing the direction of the steering wheel.
Turning the steering wheel even harder in the direction that it is already turning.
Q.10.
By beginning a left turn before reaching the center of an intersection, you:
Will likely complete the turn satisfactorily.
May hit other vehicles with the left side of your vehicle.
Can expect other drivers to move their vehicles to accommodate your turn.
Q.11.
Cargo with a high center of gravity:
Can make a vehicle likely to tip over.
Is encouraged in inclement weather.
Is required on some roads.
Q.12.
If a tire fails, you should:
Use the brakes.
Stay off the brakes.
Swerve.
Q.13.
When driving in winter, which of the following should receive extra attention in a pre-trip inspection?
Coolant and antifreeze levels
The air conditioning unit
The oil pressure
Q.14.
When braking with ABS, you should:
Pump the brake pedal.
Brake normally.
Brake harder than you would with a different braking system.
Q.15.
A truck tractor built after March 1, 1997 must be equipped with:
An Anti-Lock Braking System (ABS).
A flag.
Hydraulic brakes.
Q.16.
A pre-trip inspection should include:
A check of the engine oil level.
Removing coolant.
Washing the tire rims.
Q.17.
Rough acceleration:
Is a good way to stay awake on long trips.
Is distracting.
Can cause mechanical damage.
Q.18.
If you are being tailgated while driving a large vehicle, do all of the following, except:
Reduce your speed gradually.
Increase your following distance.
Increase your speed.
Q.19.
If an unusual noise or feeling occurs in a vehicle while it is being driven, the driver should:
Assume it is not a concern and continue driving.
Hope the vehicle does alright until it is switched to another driver.
Check the situation to determine the proper solution.
Q.20.
When driving, you should stop every ____ to take a break to avoid becoming too tired.
Half hour
Two hours
Six hours
Q.21.
If asked by a law enforcement officer to take a test to determine your blood alcohol concentration (BAC):
You can refuse to take the test without a penalty.
You can refuse taking the test but will be required to pay a $50 fine.
You will lose your CDL if you refuse to take the test.
Q.22.
Pre-trip inspections are:
Recommended.
Needed only for trips longer than 100 miles in length.
Required by law.
Q.23.
Which of the following is the best advice for driving in fog?
Try not to drive in fog.
Use your high beam headlights.
Turn off your lights.
Q.24.
If you realize you may be running late to your destination, you should:
Speed up.
Get upset.
Deal with it and drive at a safe speed.
Q.25.
In hot weather, spots on the pavement where tar is bleeding:
Are very slippery.
Offer the same amount of traction as the rest of the roadway.
Offer more traction than the rest of the roadway.
Q.26.
If driving on a surface with poor traction, a driver should accelerate slowly:
Because it is always good to accelerate slowly.
To keep from losing control of the vehicle.
So that they do not accelerate faster than the vehicle ahead.
Q.27.
An Individual Vehicle Distance Record (IVDR) does not need to include which of the following?
The dates of a trip
The total distance traveled
The number of vehicles passed
Q.28.
When trying to put out an electrical fire, you should:
Use water.
Use a B:C extinguisher.
Use an X extinguisher.
Q.29.
Wheels with welding repairs are:
Safe to be used if the repairs were done by a professional.
Safe to be used if the repair seems solid.
Not safe to be used.
Q.30.
A poor balance of weight in a trailer:
Can make handling unsafe.
Improves traction.
Increases fuel efficiency.
Q.31.
What is a tire load?
The minimum safe weight a tire can carry
The maximum safe weight a tire can carry
The weight of a tire
Q.32.
Cargo being transported should be checked:
Only before the trip.
Before the trip and again within the first 50 miles of the trip.
Only by the loading personnel.
Q.33.
If driving through flowing water or a large puddle, you should:
Increase your speed.
Gently apply the brakes.
Try to stop in the water.
Q.34.
When operating a vehicle with a dual air brake system, the driver should:
Let the vehicle warm up before driving to ensure that the fuel reaches the engine.
Let the air compressor build up a minimum of 100 psi pressure in the primary and secondary systems before driving.
Begin driving just after the vehicle starts.
Q.35.
When exiting a vehicle, it is important to maintain ____ with your vehicle at all times.
Three points of contact
Four points of contact
Two points of contact
Q.36.
To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:
Set the control to normal.
Set the control to the off position.
Set the control to the neutral position.
Q.37.
When driving on a long downhill slope, you should brake by:
Only using the brakes.
Mostly using the brakes and occasionally downshifting.
Downshifting and then using the brakes.
Q.38.
Of the following, which is the most slippery surface?
Ice that is dry
Ice that is wet
Wet pavement
Q.39.
Your horn should be used to:
Tell other drivers that you are angry.
Warn other drivers that you are near.
Frighten other drivers.
Q.40.
If confronted by an aggressive driver, you should:
Make eye contact to better communicate with them.
Ignore their gestures.
Not move out of their path of travel.
Q.41.
To inspect slack adjusters on S-cam brakes, you need to:
Park on a hill and test the brakes.
Put on gloves and push in the slack adjusters.
Chock the wheels and disengage the parking brake.
Q.42.
When driving on a wet road, you should reduce your speed by:
About one-half.
About one-third.
About one-quarter.
Q.43.
Before driving a vehicle with air brakes, you should ensure that the ____ come on automatically when air pressure falls below 45 psi.
Spring brakes
Parking brakes
Air brakes
Q.44.
When leaving a vehicle unattended, a driver should:
Always set the parking brake.
Only set the parking brake if the vehicle is parked on a slope.
Deflate the tires by 10 percent.
Q.45.
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.
Q.46.
Rust around wheel nuts may mean:
It has rained recently.
The nuts could be loose.
The tires should be replaced.
Q.47.
When an S-cam turns inside a brake drum, the S-cam:
Presses the brake shoes against the inside of the brake drum.
Presses the brake shoes against the brake linings.
Presses the brake linings against the wheel axles.
Q.48.
Having ABS on only one axle:
Can be dangerous.
Still allows you additional control when braking.
Slows the vehicle, but cannot stop it.
Q.49.
If you have more than one license:
You likely won’t be caught.
You should not tell anyone.
You may get caught through the states' shared computer network.
Q.50.
A wig wag is:
A low pressure warning device.
A tube that carries air to the brakes.
A type of air brake system.
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