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South Dakota
South Dakota CDL Knowledge Test Class A 1
Answers
Q.1.
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.2.
When driving, you should stop and take a break ____ to avoid becoming too tired.
Every half hour
Every hour
Every two hours
Every six hours
Q.3.
Skids caused by over-acceleration can usually be resolved by:
Removing your foot from the accelerator.
Braking.
Swerving to the right.
Q.4.
A wig wag is:
A low pressure warning device.
A tube that carries air to the brakes.
A type of air brake system.
Q.5.
When entering a foggy area, you should:
Stop on the side of the roadway.
Pass other vehicles.
Slow down.
Use your high beam headlights.
Q.6.
Regrooved tires:
Should not be used on any vehicle.
Should not be used on the front of a bus.
Should not be used on trucks hauling gravel.
Q.7.
How soon after starting a trip must cargo securement be checked?
After 50 miles
After 100 miles
After 250 miles
Q.8.
Backing with a trailer is dangerous because:
It is difficult to see behind the vehicle.
Most trucks do not have the ability to go in reverse.
Cargo may fall out of the trailer.
Q.9.
If brakes fail on a long downgrade, the driver should:
Turn the vehicle off and then back on to reset the brakes.
Pump the brakes.
Look for an escape ramp or other way to stop.
Q.10.
Steering wheel play of more than ____ can make steering difficult.
10 degrees
25 degrees
50 degrees
Q.11.
During a basic vehicle controls skills test exercise, your vehicle's final position should be:
In the general area that was described by the examiner.
In the exact final position described by the examiner.
Within three feet of the final position described by the examiner.
Q.12.
In cold weather, an alcohol evaporator should be checked and filled:
Once a week.
Every day.
Every hour.
Once a month.
Q.13.
For safety purposes, when should you turn off a retarder?
When the roadways are slippery
When you have a passenger
When you are carrying a heavy load
Q.14.
Service brakes should:
Be tested once a month.
Only be tested by a trained mechanic.
Be tested before every trip.
Q.15.
Of the following, which is not a recommended way to spot potential signs of trouble?
Watching the gauges
Using your senses
Checking critical items only at the beginning and end of a trip
Q.16.
When exiting a vehicle, a driver should:
Hop directly from their seat to the ground.
Maintain at least one point of contact with their vehicle.
Be turned to face their vehicle.
Q.17.
When approaching your vehicle as part of your pre-trip inspection, you should look for what as a sign of trouble?
A puddle of oil under the vehicle
Inflated tires
Lights that are not cracked
Q.18.
A low air pressure warning signal:
Is not recommended on vehicles with air brakes.
Is required on vehicles with air brakes.
Is optional on vehicles with air brakes.
Q.19.
A pre-trip inspection should include:
A check of the engine oil level.
Removing coolant.
Washing the tire rims.
Q.20.
A convex mirror is sometimes called a ____ mirror.
Bug-eye
Square
Helper
Q.21.
When accelerating on a surface with poor traction, such as a wet road, a driver should:
Speed up quickly.
Speed up slowly.
Not be concerned about the pavement.
Q.22.
Brakes may get out of adjustment:
If they are too hot.
In colder weather.
If they are used.
If they get wet.
Q.23.
A vehicle must be equipped with all of the following, except:
A fire extinguisher.
Spare electrical fuses.
Warning devices for a parked vehicle.
A flashlight.
Q.24.
When exiting your vehicle, you:
Must maintain four points of contact with the vehicle.
May turn to face the road before your exit is complete.
Must be facing away from the vehicle.
Must be facing the vehicle.
Q.25.
The two indicators that determine when you should upshift are:
Engine speed and road speed.
Other trucks and road conditions.
Timing and road position.
Oil pressure and air brake pressure.
Q.26.
What is black ice?
A thick layer of ice on the road
A thin layer of ice on the road
Ice that is black from debris on the road
Ice that is easily seen
Q.27.
A driver should always:
Stay in their lane.
Have an emergency plan.
Stay in the left lane.
Drive above the speed limit.
Q.28.
One way to prevent fatigue on long trips is to:
Take frequent breaks.
Text while driving.
Drink caffeine.
Q.29.
When experiencing cold weather, be sure to check your vehicle's alcohol evaporator:
Every three hours.
Every day.
Every other week.
Q.30.
When double clutching, if you remain in neutral for too long and can’t get your vehicle into the next gear, you should:
Stop the vehicle and start over.
Return to neutral, release the clutch, increase your speed, and try again.
Skip over your intended gear and move into the next gear.
Just keep the vehicle in neutral.
Q.31.
When entering a curve, you should:
Shift into neutral.
Use the shoulder.
Downshift.
Q.32.
While driving, your mirrors:
Should not be used.
Should only be used when changing lanes.
Should be checked regularly.
Q.33.
Windshield wiper blades should be:
Sticky.
Clean.
Brittle.
Cracked.
Q.34.
When a vehicle is started, the coolant temperature should:
Decrease.
Rise slowly.
Hold steady.
Q.35.
If something is found to be unsafe during a pre-trip inspection, you should:
Continue with the trip and make an appointment with a mechanic after the trip is completed.
Let a more experienced driver use the truck.
Get the issue fixed immediately.
Not use the items found to be unsafe, but may continue driving normally.
Q.36.
An example of required emergency equipment is:
A spare electrical fuse.
A loud horn.
A battery-operated flashlight.
Q.37.
In a leaf spring:
Leaves should be broken.
Leaves can be missing.
Leaves should not be broken.
Q.38.
While driving, if you notice anything that affects safety or could lead to mechanical problems, you should:
Wait to see if the problem goes away.
Include the concerns in your written report.
Try to fix the issue yourself.
Q.39.
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.40.
When traveling with cargo, you must make sure the cargo is secure:
No more than two times.
Every 150 miles or three hours of driving.
Only after traveling up a hill.
Only after coming to a hard stop.
Q.41.
Most heavy-duty vehicles use ____ air brake systems.
Single
Dual
Triple
Quad
Q.42.
When you must travel down a hill, when should you switch into a lower gear?
As you begin to move downward
As you go downhill and pick up speed
Before you start going downhill
Q.43.
Drowsy driving is most common during:
The night.
The early morning.
The mid-afternoon.
Q.44.
If one air system in a dual air brake system is very low on pressure:
None of the brakes will work at all.
Either the front or rear brakes will not be operating fully.
There will be no noticeable affect.
Lights on the outside of the tractor will flash.
Q.45.
During an applied leakage test, the maximum leakage rate for a double combination vehicle is ____ in a minute.
2 psi
4 psi
6 psi
Q.46.
A low air pressure warning signal should activate:
When tank pressure falls below 120 psi.
When tank pressure falls below 60 psi.
When tank pressure falls below 10 psi.
When tank pressure falls below 5 psi.
Q.47.
When it is difficult for others to see your vehicle, such as at dawn or dusk, you can help other drivers by:
Keeping your lights off.
Turning your lights on.
Driving on the shoulder.
Waving an arm out the window.
Q.48.
The safety belt should:
Not be adjustable.
Latch securely.
Be frayed.
Q.49.
During an applied leakage test, what is the maximum leakage rate that is safe for a single vehicle with air brakes?
10 psi in one minute
5 psi in one minute
3 psi in one minute
Q.50.
What helps prevent wheel lockup when braking?
An Anti-Lock Braking System (ABS)
Air brakes
An alternator
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