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Driving Test
South Carolina
South Carolina CDL Knowledge Test Class B 1
Answers
Q.1.
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.2.
Broken suspension parts:
Are not a cause for concern.
Are extremely dangerous.
Cannot be identified.
Q.3.
Which of the following is not a reason to use your mirrors?
You are changing lanes.
You are making a turn.
You are looking at fuel prices.
Q.4.
In very hot weather, the air pressure in tires may decrease.
True
False
Q.5.
If using spring brakes when hauling a heavy load, a complete stop will:
Be impossible.
Take a long time.
Take a short amount of time.
Q.6.
Which gas would cause concern due to a faulty exhaust system?
Oxygen
Carbon monoxide
Nitrogen
Q.7.
When traveling down a steep downgrade:
The air brakes should be used.
The vehicle should be placed in a low gear and the driver should use engine braking.
The driver should continually downshift instead of using the brakes.
Q.8.
If an air compressor is belt-driven, the belt should be routinely checked to ensure that it is:
Thin.
Properly tightened.
Cracked.
Q.9.
The air storage tanks:
Hold only enough air for one braking cycle.
Hold enough air for brakes to be used several times if the compressor stops working.
Do not hold air unless there is an emergency.
Hold enough air for more than 1,000 braking cycles.
Q.10.
If you are unsure if there is enough space for your vehicle to safely pass under an upcoming bridge, you should:
Speed up.
Swerve while under the bridge.
Slow down.
Q.11.
Dual tires should:
Not both be in contact with the road surface.
Not touch one another.
Be different sizes from one another.
Q.12.
When driving, it is important to:
Avoid using your mirrors while in heavy traffic.
Look only to the front and right side of the vehicle.
Look to the front, sides, and rear of the vehicle.
Q.13.
When a brake pedal is pressed and the S-cam is turned, the S-cam:
Presses the brake shoes against the inside of the brake drum.
Tightens the brake drum onto the axle.
Presses the brake lining against the wheel.
Releases air from the air tanks.
Q.14.
If transporting 30 feet of cargo on a flatbed trailer, you should use a minimum of ____ to restrain the cargo.
One tie-down
Two tie-downs
Three tie-downs
Four tie-downs
Q.15.
If you must stop on the side of a one-way or divided highway, how far behind your vehicle should you place warning devices?
10, 15, and 30 feet
10, 25, and 50 feet
10, 100, and 200 feet
Q.16.
Improperly loaded cargo:
Should not be a concern.
Can be dangerous.
Reduces stress on the trailer frame.
Is unsafe, but is unlikely to damage a vehicle.
Q.17.
Before starting down a hill, be sure to:
Accelerate.
Switch into a high gear.
Sound your horn.
Switch into a low gear.
Q.18.
If braking at a speed of 55 mph while driving on dry pavement, the brake lag can add ____ to your vehicle's total stopping distance.
32 feet
15 feet
50 feet
10 feet
Q.19.
A truck may need to be under the legal maximum weight limit when being driven:
On a flat road.
On a mountainous road.
In heavy traffic.
At night.
Q.20.
Which of the following is not an example of a driving hazard?
An accident on the roadway
An open road
A police car assisting a motorist on the side of the road
An ice cream truck
Q.21.
Hydroplaning:
Only occurs at extremely high speeds.
Can occur at speeds as slow as 30 mph.
Happens most frequently when tire pressure is too high.
Happens most frequently when tires have good tread.
Q.22.
When leaving your vehicle unattended:
The parking brake must be always be used.
The parking brake should never be used.
Windows in the cab should be lowered.
Q.23.
Which of the following is not a reason to cover cargo?
To protect people from spilled cargo
To protect the cargo from weather
To keep the cargo a secret
Q.24.
If your vehicle is hydroplaning, you should:
Speed up.
Not apply the brakes.
Put the vehicle in reverse.
Turn the steering wheel as hard as possible.
Q.25.
Texting while driving is especially dangerous because:
It is both a mental and physical distraction.
A message may be upsetting to the driver.
People like to read and may become too engaged in their phones.
Q.26.
Mirrors should be used:
Only when there may be an emergency.
Regularly.
By a helper to monitor your blind spots.
Q.27.
When stopping, the brake pedal should be:
Pressed down quickly with both feet.
Pressed down gradually.
Lifted up quickly.
Q.28.
After the engine is started, warning lights and buzzers should all:
Stay on.
Flicker occasionally.
Turn off right away.
Turn off once the vehicle begins moving.
Q.29.
If required to complete a vehicle inspection report in writing, the report must be signed:
Every day.
Only if defects have been noted and certified to have been repaired.
Only if the repairs are estimated to cost more than $1,000.
Only if requested to do so by a law enforcement officer.
Q.30.
Which of the following is not a reason to cover cargo?
Protecting people from spilled cargo
Protecting the cargo from the weather
Preventing other drivers from looking at what is being transported
Q.31.
When you are about to start down a hill, you should switch into a ____ gear.
Higher
Faster
Lower
Q.32.
On low bridges:
Height warnings must always be posted.
Height warnings must be posted at least twice.
Height warnings may be posted, but do not have to be.
Q.33.
When conducting a pre-drive inspection:
The inspection report is not important.
The inspection report must only be reviewed if there will be passengers in the vehicle.
The previous inspection report should be reviewed, if applicable.
Q.34.
When leaving your vehicle unattended:
The parking brake should be used.
The parking brake only needs to be used if the vehicle is parked on a slope.
The parking brake should not be used, as it can damage the tires.
Q.35.
A pre-trip inspection:
Should be done in the same way every time.
Should be done differently every time.
Does not always need to include all items of concern.
Q.36.
The person responsible for the safe transport of cargo is the driver.
True
False
Q.37.
If stopped on the road or shoulder, within 10 minutes, you must:
Place emergency warning devices.
Alert local law enforcement.
Stand behind your vehicle and motion for traffic to pass you.
Call a mechanic.
Q.38.
How should you brake if your vehicle loses its ABS?
Brake normally.
Pump the brake repeatedly.
Push the brake pedal down as hard as you can.
Avoid using the brakes.
Q.39.
The minimum size of placards identifying hazardous materials is:
Four inches.
Six and one-quarter inches.
Nine and three-quarter inches.
10 and three-quarter inches.
Q.40.
Roads are slippery when it first begins to rain because:
Water is slippery.
The fresh rain mixes with oil on the roadway.
The water has nowhere to go.
Concrete can be slippery.
Q.41.
When completing an offset back/left parking maneuver, a driver should:
Pull straight forward, then back to the left.
Drive straight back, then pull forward to the left.
Pull straight forward, then drive straight back.
Q.42.
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.43.
A modulating control valve can control the:
Spring brakes.
Landing gear.
Air brakes.
Anti-lock braking system (ABS).
Q.44.
If you see lights ahead while driving in fog:
You can assume the lights are on the road.
It may be a reflection.
It may be an optical illusion.
The lights may not indicate where the road is as the vehicle may have pulled off the roadway.
Q.45.
Loading cargo:
Must be done by the driver.
Can be done by a second person who is responsible for the safety of the cargo.
Can be done by a second person, but the driver is responsible for the safety of the cargo.
Must be done by a person from the shipping company.
Q.46.
The brake pedal is part of which braking system?
The service brake system
The parking brake system
The emergency brake system
The auxiliary brake system
Q.47.
How long is a CDL valid?
One year
Two years
Four years
Five years
Q.48.
Wheel rims that have been welded should:
Be painted.
Be placed on tires in the rear of the vehicle.
Not be used.
Q.49.
Rollovers happen when:
Drivers turn too fast.
Drivers turn too slowly.
There is a lot of traffic.
Vehicles are too close to one another.
Q.50.
If you are unsure if there is enough space for your vehicle to safely pass under an upcoming bridge, you should:
Increase your speed.
Swerve as you pass under the bridge.
Slow down.
Drive on the shoulder.
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