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Driving Test
Iowa
Iowa CDL Knowledge Test Class B 1
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Q.1
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Do not base your decision to shift gears on:
The speed of your engine (rpm).
The speed of the road (mph).
The actions of the vehicle next to you.
Q.2
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When traction is poor, a driver should accelerate especially slowly:
Because it is always good to accelerate slowly.
To keep from losing control of the vehicle.
To keep from accelerating faster than the vehicle ahead.
Q.3
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What is Gross Combination Weight?
The total weight of the powered unit, trailer, and cargo
The total weight of a single vehicle without its load
The maximum weight allowed by the manufacturer
Q.4
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How can you check hydraulic brakes?
Pump the brake pedal three times then apply firm pressure to the pedal for five seconds. The brake pedal should not move.
Pump the brake pedal three times then apply firm pressure to the pedal for five seconds. The brake pedal should move slowly toward the floor.
Pump the brake pedal three times then apply firm pressure to the pedal for five seconds. The brake pedal should slowly rise.
Q.5
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When traveling long distances, you should:
Take rest breaks.
Drive as fast as possible.
Drive through the night.
Q.6
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Which of the following is not part of a vehicle’s air brake system?
Air gauges
Low pressure warning device
Air filter
Q.7
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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.8
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Blocking cargo:
Should never be done.
Should only be done in poor weather.
Prevents cargo from moving.
Q.9
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If you plan to transport hazardous materials, you must pass which endorsement test?
Tank
Hazardous materials
Passengers
Q.10
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Driving at night is usually:
More difficult than driving during the day.
Simpler than driving during the day.
Discouraged.
Q.11
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If a load is 40 feet long, it should be secured by at least ____ tie-downs.
Two
Three
Four
Q.12
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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.13
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If approaching a railroad crossing that is being approached by a train, you should:
Try to cross the tracks quickly.
Drive around any lowered gates.
Stop and wait for the train to pass before beginning across the tracks.
Q.14
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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.15
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On slippery roads, you should:
Accelerate and slow down frequently.
Adjust your driving to match weather conditions.
Tailgate other vehicles.
Q.16
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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.17
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Dry bulk tanks:
Usually have low centers of gravity.
Usually have high centers of gravity.
Are usually not allowed to cross railroad tracks.
Q.18
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When an S-cam turns inside a brake drum, the S-cam:
Presses the brake shoes against the inside of the brake drum.
Presses the brake shoes against the brake linings.
Presses the brake linings against the wheel axles.
Q.19
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A fatigued driver:
Is usually extra alert.
Is usually more conscientious than a typical driver.
May be slower to make critical decisions than a typical driver.
Q.20
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You may be an aggressive driver if you:
Expect delays on your drive.
Slow down and maintain a reasonable following distance.
Make hand gestures that could anger other drivers.
Q.21
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Blocking is used to:
Keep cargo in a large box.
Prevent cargo from sliding in a trailer.
Prevent cargo from falling out of a trailer.
Q.22
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You should ____ if the low pressure warning signal activates while you are driving.
Stop where you are and park
Exit the roadway as soon as safely possible
Continue driving normally
Q.23
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Which of the following is not a good rule when using turn signals?
Signal early. Signal well before a turn or lane change.
Signal continuously. Do not cancel a signal until the turn is completed.
Don’t over-signal. If no one is near you, there is no need to signal.
Q.24
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When stopping, the brake pedal should be:
Pressed down quickly with both feet.
Pressed down gradually.
Lifted up quickly.
Q.25
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Before driving a vehicle with air brakes, you should ensure that the ____ come on automatically when air pressure falls below 45 psi.
Spring brakes
Parking brakes
Air brakes
Q.26
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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.27
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When loading a trailer, it is important to:
Place as little weight as possible over the axles.
Place a well-balanced amount of weight over the axles.
Place weight over only the axles.
Q.28
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Do not operate a vehicle if any brake drums have cracks that are larger than ____ of the width of the friction area.
One half
One third
One fifth
Q.29
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While driving, gauges are:
Unreliable.
Unpredictable.
To be monitored for potential signs of trouble.
Q.30
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A cargo van is:
Usually the same height with or without a load.
Usually taller with a heavy load than with a light load.
Usually shorter with a heavy load than with a light load.
Q.31
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The heavier the vehicle:
The less important the brakes become.
The harder the brakes need to work.
The quieter the brakes will sound.
Q.32
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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.33
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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.34
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A commercial motor vehicle driver:
May use any cell phone while driving.
May only use a hands-free cell phone while driving, if permitted.
May only use a cell phone while driving on rural roads.
Q.35
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When pulled off on the side of the road:
A driver should keep the driver’s side door open.
A driver should turn on the emergency flashers.
The driver should wave their arms.
Q.36
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What is the average driver’s reaction time?
1/16 of a second
1/8 of a second
3/4 of a second
Q.37
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A ramp's posted speed limit:
Is suitable for all vehicles.
Is suitable for some vehicles, but may be too fast for a large CMV.
Is just a suggestion and may be exceeded.
Q.38
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Distracted driving:
Is not a concern.
Only occurs as a result of people who are physically doing something while driving.
Can occur as a result of mental activities, such as daydreaming.
Is encouraged on uncrowded roads.
Q.39
Submit
If convicted of any traffic violations, excluding parking violations, you must:
Notify your employer within 30 days.
Place a sign on the back of your vehicle noting the conviction.
Forfeit your CDL for six months.
Q.40
Submit
Steering wheel play of more than ____ can make steering difficult.
10 degrees
25 degrees
50 degrees
Q.41
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When making tight maneuvers, it is important for a driver to:
Open their door for a better look.
Use their mirrors.
Flash their headlights.
Q.42
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Before a trip, you should make sure that:
The brake pedal sticks.
The gas pedal is loose.
The grooved pedal surface has not been smoothed out.
Q.43
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When inspecting your tires, you do not want to find:
Tire tread that is 4/32 of an inch deep.
Valve stems without damage.
Mismatched tire sizes.
Q.44
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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.45
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On a leaf spring:
Leaves should shift.
Leaves can be missing.
Leaves should not be broken.
Q.46
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Anti-Lock Braking Systems (ABS):
Reduce a vehicle's normal braking capacity.
Are in addition to other braking systems and do not reduce a vehicle's braking power.
Are not effective on larger vehicles.
Q.47
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Using a helper when backing up a large vehicle is:
Encouraged.
Discouraged.
Illegal.
Q.48
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When should mirror adjustments be made?
Before starting a trip
While driving
When a vehicle is stopped at a traffic signal
Q.49
Submit
Emergency equipment in a vehicle is:
Only required for vehicles that are transporting hazardous materials.
Only required during interstate travel.
Required.
Q.50
Submit
When alley docking, you should first:
Position your vehicle directly in front of the alley.
Back up directly in front of the alley.
Stop parallel to the outer boundary of the alley.
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