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California
California CDL Knowledge Test Class A 1
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Q.1
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Rust around wheel nuts may mean:
It rained recently.
The nuts are loose.
The nuts are too tight.
Q.2
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Drivers trapped behind a slow-moving vehicle often:
Follow the vehicle too closely.
Allow the vehicle plenty of space.
Are happy with the speed of travel.
Q.3
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Mirrors should be checked:
Before every lane change.
When changing lanes, but only when other vehicles are nearby.
When changing lanes, but only if it is dark outside.
Q.4
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To apply for a CDL, an applicant must be at least:
15 years old.
18 years old.
21 years old.
Q.5
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If you’re unfamiliar with the area in which you must back up, you should:
Get out of your vehicle and walk around the area to become more familiar with it.
Not use both side mirrors because it can be distracting.
Wait for someone else to back up in the area so you can see how they do it.
Q.6
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A ____ allows a driver to gradually apply spring brakes.
Modulating control valve
Trailer air supply control
Relay valve
Q.7
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Cargo should have one tie-down for every ____ of cargo.
Five feet
10 feet
20 feet
Q.8
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When stopping a manual transmission vehicle, you should:
Push the clutch in when the engine is close to idle.
Push the clutch out when the engine is close to idle.
Shift into neutral when the engine is close to idle.
Q.9
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Poor weight balance:
Improves handling.
Makes handling more difficult.
Increases a driver’s ability to steer.
Q.10
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One way to prevent hydroplaning on wet road surfaces is to:
Ensure that your tires have good tread depth.
Under-inflate your tires.
Drive faster than usual.
Q.11
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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.12
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What should you do if your vehicle gets stuck on railroad tracks?
Stay in the vehicle.
Get out of the vehicle and call for assistance.
Continue trying to get your vehicle off the tracks until you are successful.
Q.13
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If the low pressure warning signal activates while you are driving, you should:
Continue driving normally.
Exit the road and park as soon as safely possible.
Stop where you are and park.
Q.14
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If you must drive in reverse, using driver's side backing:
Is always encouraged.
Is discouraged.
Is only recommended if it is raining.
Q.15
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Regrooved tires are:
Allowed only on the front of a bus.
Allowed only on the rear of a bus.
Not allowed anywhere on a bus.
Q.16
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What do air brakes use to make the brakes work?
Compressed air
Outside air
Non-compressed air
Q.17
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As part of the vehicle inspection test, you will be asked to:
Explain what you would inspect and why.
Replace an electrical fuse.
Unload the trailer.
Q.18
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If you are disqualified from driving:
Your employer will be notified by the state.
You must notify your employer within two business days.
You must notify your employer within a month.
Q.19
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If there is a fire in your vehicle, you should not:
Park in an area away from buildings, trees, brush, and other vehicles.
Pull into a service station.
Notify emergency services of your problem and your location.
Q.20
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Driving at night is:
Safer than driving during the day.
Just as safe as driving during the day.
More dangerous than driving during the day.
Q.21
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To avoid a hazard, you:
Should always come to a complete stop.
May need to swerve your vehicle out of the way.
Should change lanes without looking.
Q.22
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When driving in fog, you should:
Slow down.
Speed up.
Drive on the shoulder.
Q.23
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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
Q.24
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What must be on all air tanks with air-braked vehicles?
A check valve
A lock
A trap door
Q.25
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When changing lanes, turn signals:
Should not be used.
Should only be used if a vehicle is close to you.
Should be used each time.
Q.26
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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.27
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During an inspection, slack adjusters on S-cam brakes should not move more than:
One foot.
One centimeter.
One inch.
Q.28
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When starting your vehicle, the coolant temperature should:
Not change.
Increase gradually.
Quickly jump from low to high.
Q.29
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Some air brake systems introduce alcohol into the system to:
Make the brakes work without squeaking.
Prevent ice from forming in the brake system.
Prevent people from breathing the air from the system.
Q.30
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If you are taking the driving test and the route does not include a railroad crossing, you:
Will not have to do anything related to a crossing.
May have to explain how you would cross railroad tracks.
Will have to take a different route.
Q.31
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Always perform the steps of a pre-trip inspection in the same order each time because:
You will be less likely to forget something.
You will have more time to complete the inspection.
It is required by law.
Q.32
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If a tire fails, you should:
Use the brakes.
Stay off the brakes.
Swerve.
Q.33
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During an applied leakage test, the maximum leakage rate for a double combination vehicle is:
10 psi in a minute.
8 psi in a minute.
6 psi in a minute.
4 psi in a minute.
Q.34
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During the driving test, the examiner will be scoring you on:
Attitude.
How quickly you arrive to your destination.
Your general driving behavior.
Q.35
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If your brakes fail while you are traveling downhill and there is no available escape ramp, you should:
Keep pumping the brakes.
Turn the vehicle off.
Drive into an open field.
Q.36
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The air storage tanks:
Hold only enough air for one braking cycle.
Hold enough air for the brakes to be used several times if the compressor stops working.
Do not hold air unless there is an emergency.
Q.37
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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.38
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If you are confronted by an aggressive driver, you should:
Make eye contact.
Ignore their gestures.
Try to race.
Q.39
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If a vehicle is carrying hazardous cargo, placards must be placed:
Only on the front of the vehicle.
On the front, rear, and sides of the vehicle.
Only on the driver’s side of the vehicle.
Q.40
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Before attempting to put out an engine fire:
The hood should be opened.
The engine should be turned off.
The accelerator should be depressed to use up the remaining fuel.
Q.41
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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.
Q.42
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How much distance will an air brake-equipped vehicle need to come to a complete stop if it is traveling at 55 mph under ideal driving conditions?
300 feet
100 feet
450 feet
Q.43
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An emergency brake must be controlled by:
Mechanical force.
Air pressure.
Gravity.
Q.44
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A danger of swerving to avoid a hazard while driving a large truck is that:
The truck may miss the object.
The truck may flip over.
The truck may stay in the same lane.
Q.45
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An air compressor governor controls:
When the air compressor pumps air into the air storage tanks.
How fast air is pumped into the air storage tanks.
The temperature of the air pumped into the air storage tanks.
Q.46
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With the exception of the straight line backing exercise, a driver may exit their vehicle and check its position during testing exercises up to:
One time.
Two times.
Three times.
Q.47
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Every vehicle registered in California must have at least:
One mirror.
Two mirrors.
Three mirrors.
Q.48
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When loading a trailer, weight should be:
Placed as high as possible.
Placed as low as possible.
Placed as far to the left as possible.
Q.49
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If you are driving at a reduced speed in a construction zone when you spot a construction worker near the road, you should:
Speed up.
Stay at your current speed.
Further reduce your speed.
Q.50
Submit
Which of the following is not a cause of hydraulic brake failure?
Loss of hydraulic pressure
Brake fade on long hills
Downshifting
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