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They may not be permitted everywhere.
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They can help to slow a vehicle.
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They cannot be turned off.
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Iowa CDL Permit Test - Knowledge Test Class B
(From the 2020 Iowa CDL driver handbook)
| Number of questions: | 50 |
| Passing score: | 40 |
Directions:
This license is required for driving a single vehicle with a GVWR of more than 26,001 pounds, and a trailer not to exceed 10,000 pounds gross vehicle weight rating, or a vehicle designed to transport 24 or more people (including the driver). To receive this license, applicants must pass a 50-question test. To pass, applicants must answer 40 questions correctly. Each question has three or four possible answer choices. Test questions come from the Iowa Commercial Driver License Manual. Questions come from chapters covering: Introduction, Driving Safely, Transporting Cargo Safely, Air Brakes (if applicable), Pre-Trip Vehicle Inspection Test, Basic Vehicle Control Skills Test and On-Road Driving.. Endorsements that may be used with a Class B CDL are: Hazardous materials, Tank, Passenger, HazMat and Tank, Air Brakes and School bus.
Passing grade —
10 or fewer errors
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1.
What is a drawback of retarders?
2.
When you must travel down a hill, when should you switch into a lower gear?
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As you begin to move downward
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As you go downhill and pick up speed
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Before you start going downhill
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3.
If you have more than one license:
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You likely won’t be caught.
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You should not tell anyone.
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You may get caught through the states' shared computer network.
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4.
What is the minimum number of tie-downs required to secure a 10-foot piece of cargo?
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One
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Two
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Three
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5.
Header boards:
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Should never be used.
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Protect the driver from being hit by cargo.
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Protect the driver's head when entering the cab of a truck.
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6.
Overloading a vehicle with cargo:
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Usually has no effect on the vehicle.
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Can impact the vehicle's steering and brake control.
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Can impact the vehicle's electrical system.
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7.
Pre-trip inspections should be done:
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Differently each time in order to place emphasis on different items.
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The same way each time to prevent you from forgetting anything.
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Once in a while.
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