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Driving Test
Iowa
Iowa CDL Knowledge Test Class A 1
Answers
Q.1.
When driving in fog, you should:
Slow down.
Speed up.
Drive on the shoulder.
Q.2.
When loading cargo, it is important to:
Stack items as high as possible.
Know the weight capacity rating of the suspension system.
Place light items underneath heavier items.
Q.3.
Most heavy vehicles use the ____ method when changing gears.
Double clutching
Double shifting
Triple clutching
Q.4.
A truck should be parked:
So that it must be backed up to leave the space.
So that it can be pulled forward to leave the space.
On the grass.
Q.5.
If you’re not sure what to do to extinguish a fire in your vehicle, you should:
Use water.
Stay inside the vehicle.
Wait for the firefighters.
Q.6.
The leakage rate for a single vehicle with air brakes should be no more than ____ in one minute during a static leakage test.
1 psi
2 psi
3 psi
Q.7.
Causing a fatality through negligent operation of a CMV will result in the loss of your CDL for a minimum of:
One month.
Six months.
One year.
Three weeks.
Q.8.
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.9.
Air tank drains should:
Not be used by the driver.
Only be used when it is wet outside.
Be used to drain the tanks completely.
Q.10.
____ are the most likely to be affected by strong winds.
Light vehicles
Heavy vehicles
Vehicles with open windows
Q.11.
When should you slow for a curve?
Before entering the curve
While in the curve
After the curve
Q.12.
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.13.
Dry bulk tanks:
Cannot be driven on interstates.
Take special care to be driven.
Are usually not allowed to cross railroad tracks.
Q.14.
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.15.
When using a mirror, you should:
Look quickly at the mirror.
Stare at the mirror for a long time.
Use only the driver’s side mirror.
Q.16.
Texting while driving should:
Only be done on straightaways.
Only be done in curves.
Not be done.
Q.17.
Traction is important in:
Safe braking.
Properly using turn signals.
Operating the horn.
Q.18.
If your brakes fail on a downgrade, your best hope to stop is to:
Use an escape ramp.
Use the shoulder.
Drift to a stop.
Q.19.
If approaching a vehicle with a distracted driver, you should:
Quickly pass the vehicle.
Maintain a safe distance from the vehicle.
Closely follow the vehicle.
Q.20.
If there is a fire in your vehicle and you are not sure how to extinguish it, you should:
Use a fire extinguisher.
Try douse the flames with water.
Move away from the flames and wait for the firefighters.
Q.21.
Within 10 minutes of stopping on the side of the road, you must:
Place emergency warning devices.
Alert local law enforcement.
Call a mechanic.
Q.22.
If confronted by an aggressive driver, you should:
Keep your vehicle in front of them.
Make eye contact with them
Ignore their gestures.
Q.23.
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.24.
In a vehicle with dual parking control valves, a separate air tank can be used:
To make the air brakes work more effectively.
To temporarily release the spring brakes.
To charge the brakes on the rear trailer.
Q.25.
When transporting cargo, drivers must check the securement of the cargo every:
10 miles.
150 miles.
500 miles.
Q.26.
To prevent becoming an aggressive driver you should:
Increase your speed.
Make gestures at other drivers.
Give other drivers the benefit of the doubt.
Q.27.
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.28.
When driving:
It is best to hide your intentions from others.
You should only use turn signals if there are vehicles near you.
You should not use turn signals in construction zones.
You should always use turn signals to warn others about your intentions.
Q.29.
Failing to drain air tanks could result in:
Water accumulations freezing and causing brake failure.
Squishy brakes.
Too much air collecting in the tanks.
Q.30.
If a load is 10 feet long, it must be secured by a minimum of ____ tie-downs.
Two
Three
Four
Q.31.
When turning, you should:
Signal before the turn.
Turn off your turn signal just before starting the turn.
Signal only if vehicles are in front of you.
Q.32.
Radial and bias-ply tires:
Should be used together.
Should be used together on the front of a vehicle.
Should not be used together.
Q.33.
When approaching a railroad crossing, you should:
Rely on warning signals to indicate if a train is approaching.
Rely on the actions of other motorists to indicate if a train is approaching.
Not rely solely on warning signals to indicate if a train is approaching.
Q.34.
If the safety relief valve in the air brake system releases air:
The compressor needs more air.
The air pressure has become too high.
The brakes are fully operational.
Q.35.
During the vehicle inspection test, you will be asked to:
Change a tire.
Explain to the examiner what you are inspecting and why.
Estimate the weight of a load on a trailer.
Q.36.
What is a drawback of retarders?
They may not be permitted everywhere.
They can help to slow a vehicle.
They cannot be turned off.
Q.37.
When you need to change lanes:
Other vehicles will likely get out of your way.
You should change lanes slowly and smoothly.
You should wait to change lanes until you are in an intersection.
Q.38.
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.39.
Reading a text message while driving is:
Encouraged.
Allowed only if you are not pulling a trailer.
Illegal.
Q.40.
If an Anti-Locking Braking System (ABS) is not working on a truck:
The truck will not have any brakes.
The truck should be driven only at low speeds.
The truck will still have brakes.
Q.41.
When a vehicle is started, the coolant temperature should:
Decrease.
Rise slowly.
Hold steady.
Q.42.
Which of the following vehicles is not exempted in requiring the driver to hold a CDL?
A military vehicle
A school bus
An emergency vehicle
Q.43.
____ is an example of required emergency equipment.
A spare electrical fuse
A loud horn
A battery-operated flashlight
Q.44.
When driving under wet conditions, a lack of spray coming from the tires of other vehicles indicates that:
Ice has formed on the road.
The pavement is dry.
The spray is caught on the underside of the vehicle.
Q.45.
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.46.
If you see taillights ahead while you are driving in fog:
The lights may not indicate where the road is as the vehicle may have pulled off the roadway.
You can assume the vehicle ahead is on the road.
It may be an optical illusion.
Q.47.
Which of the following is true?
It is safe to drive on a tire that is missing one or two lug nuts.
A cracked lock ring on a rim is safe if you are not driving faster than 55 mph.
A missing clamp on a rim is dangerous and should be corrected.
Q.48.
After a tire has been changed, the driver should stop after a short distance to:
Check the tightness of the lug nuts.
Lower the tire's air pressure.
See if rocks have gotten into the tread.
Q.49.
When transporting cargo, drivers must check the securement of the cargo every:
10 miles.
150 miles.
500 miles.
Q.50.
What is traction?
Friction between the tires and road
Tires' rates of rotation
The length of time needed to activate the brakes
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