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Driving Test
Iowa
Iowa CDL Knowledge Test Class A 2
Answers
Q.1.
When should mirrors be adjusted?
While driving
Before driving
After driving
Q.2.
Rims with welding repairs:
Are not safe to use.
Are acceptable to be used on tires in the rear of the vehicle.
Are acceptable to be used if carrying a light load.
Q.3.
An application pressure gauge shows:
How much air pressure is being applied to the brakes.
How much air pressure is available.
How much air pressure is required to stop a vehicle.
Q.4.
Skids caused by over-acceleration can usually be resolved by:
Removing your foot from the accelerator.
Braking.
Swerving to the right.
Q.5.
The only way to sober up after consuming alcohol is to:
Take a cold shower.
Exercise.
Wait.
Q.6.
When driving at night, you should do all of the following, except:
Make sure you are rested.
Make sure your glasses are clean.
Wear sunglasses.
Q.7.
During a pre-trip inspection, belts should be:
Loosened.
Checked for tightness.
Scrubbed clean.
Left alone and not inspected.
Q.8.
In cool weather, as the temperature begins to rise and ice begins to melt:
It is usually safe to drive.
The road will become even more slippery.
Traction will increase.
Q.9.
You must have an air brake endorsement:
To use a vehicle with air brakes.
To drive any truck with a trailer.
To transport hazardous materials.
Q.10.
Dry bulk tanks:
Cannot be driven on interstates.
Take special care to be driven.
Are usually not allowed to cross railroad tracks.
Q.11.
Aggressive driving is:
Operating a vehicle in a selfish or pushy manner.
Operating a vehicle with a strong regard for other motorists’ safety.
Operating a vehicle in the left lane.
Q.12.
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.13.
Distracted driving can be avoided by:
Pre-programming radio stations.
Smoking while driving.
Eating while driving.
Q.14.
What is removed when an air tank is drained?
Water and oil
Ammonia
Liquid cleaners
Q.15.
Eating while driving is:
A good way to save time.
A dangerous activity.
Acceptable if you are eating foods that are easy to eat.
Q.16.
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.17.
What should be done before transporting an over-length load?
Special transit permits should be acquired.
Fire departments along the route should be alerted.
Tolls should be paid.
Q.18.
If you remain in neutral for too long while switching gears:
The vehicle will speed up.
You may have trouble putting the vehicle into the next gear.
You may kill the engine.
Q.19.
If exiting a bus, a driver must:
Never make contact with the handrail.
Maintain contact with the handrail.
Move quickly.
Q.20.
Which of the following is not a reason to cover cargo?
To protect people from spilled cargo
To protect the cargo from weather
To protect the cargo from animals
Q.21.
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.22.
Using the brakes creates heat. If too much heat is produced:
The brakes may not work.
The brakes may squeak more than usual.
The brakes will brake unevenly.
Q.23.
If an air compressor is belt-driven, the belt should be routinely checked to ensure that it is:
Thin.
Properly tightened.
Cracked.
Q.24.
If a vehicle is equipped with power steering, the hoses should be checked:
For leaks.
For the proper amount of brake fluid.
To ensure that they are connected to the battery.
Q.25.
Texting while driving is:
Allowed if you are contacting your employer.
Allowed when driving on rural roads.
Not allowed.
Q.26.
Hydroplaning happens most often when:
A vehicle is traveling faster than 60 mph.
Tire pressure is too low.
Tire tread is too deep.
Q.27.
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.28.
If your vehicle is hydroplaning, you should:
Turn the steering wheel as hard as possible.
Not use the brakes.
Put the vehicle in reverse.
Q.29.
If confronted by an aggressive driver, you should:
Keep your vehicle in front of them.
Make eye contact with them
Ignore their gestures.
Q.30.
While driving, gauges are:
Unreliable.
Unpredictable.
To be monitored for potential signs of trouble.
Q.31.
Having weight loaded in a way that creates a high center of gravity:
Increases the likelihood of a rollover.
Increases the likelihood that items will fall down.
Increases the difficulty of unloading the cargo.
Q.32.
Heights posted at bridges:
Are always accurate.
Are legally binding.
Can be incorrect.
Q.33.
Roads are the most slippery right after it begins to rain because:
The water mixes with the oil and grease on the road that have not yet washed away.
Roads are naturally slippery.
The gravel gets washed into the middle of the lane.
Q.34.
What is the average driver’s reaction time?
1/16 of a second
1/8 of a second
3/4 of a second
Q.35.
A ____ allows a driver to gradually apply spring brakes.
Modulating control valve
Trailer air supply control
Relay valve
Q.36.
Black ice is:
Usually thick.
Usually thin.
Not a hazard when driving.
Q.37.
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.38.
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.39.
When making a lane change, your turn signal:
Should always be used.
Should only be used if there is traffic present.
Should only be used between dusk and dawn.
Q.40.
Oversized loads:
Can never be transported by a truck.
Should only be transported during the day.
Should receive proper authorization to ensure compliance with state and local laws.
Q.41.
Vehicles equipped with Anti-Lock Braking Systems (ABS) have ____ malfunction lamps to indicate when the ABS is not working.
Green
Blue
Yellow
Q.42.
You should not use your mirrors:
When changing lanes.
When making a turn.
To determine how fast you are traveling.
Q.43.
Mirrors should be:
Checked only when changing lanes.
Checked frequently.
Checked only if there is a reason to suspect a problem.
Q.44.
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.45.
When starting from a stop:
A vehicle should shift to the right.
A vehicle should be put into third gear.
A vehicle should not roll back.
Q.46.
When starting your vehicle, the coolant temperature should:
Not change.
Increase gradually.
Quickly jump from low to high.
Q.47.
Blocking a load:
Is dangerous and should never be done.
Helps to stabilize the load.
Is only done with liquid cargo.
Q.48.
The center of gravity in a trailer should be:
As high as possible.
As low as possible.
At the rear of the trailer.
Q.49.
If your vehicle is hydroplaning, you should:
Use the accelerator.
Not use the brakes.
Put the vehicle in a higher gear.
Q.50.
Air brakes use ____ to function.
Compressed air
Liquid nitrogen
Carbon dioxide
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