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Modulating control valve
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Trailer air supply control
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Relay valve
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California CDL Permit Test - Knowledge Test Class A
(From the 2021 California CDL driver handbook)
| Number of questions: | 50 |
| Passing score: | 40 |
Directions:
This license is required for driving any legal combination of vehicles, including vehicles under Class B and Class C. The GVWR of a trailer is not to exceed 10,000 pounds. To receive this license, applicants must pass a 50-question test. Each question has three answer choices. To pass, applicants must answer 40 questions correctly. Test questions come from the California Commercial Driver Handbook. Questions come from chapters covering: Introduction, Driving Safely, Transporting Cargo Safely, Air Brakes (if applicable), Combination Vehicles, Pre-Trip Vehicle Inspection Test, Basic Vehicle Control Skills Test and On-Road Driving. Endorsemetns that may be used with a Class A CDL are: Hazardous materials, Tank, Passenger, Doubles/Triples, HazMat and Tank, Air Brakes and School bus.
Passing grade —
10 or fewer errors
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1.
A ____ allows a driver to gradually apply spring brakes.
2.
If you’re unfamiliar with the area in which you must back up, you should:
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Get out of your vehicle and walk around the area to become more familiar with it.
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Not use both side mirrors because it can be distracting.
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Wait for someone else to back up in the area so you can see how they do it.
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3.
Cargo should have one tie-down for every ____ of cargo.
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Five feet
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10 feet
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20 feet
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4.
Drivers trapped behind a slow-moving vehicle often:
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Follow the vehicle too closely.
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Allow the vehicle plenty of space.
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Are happy with the speed of travel.
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5.
To apply for a CDL, an applicant must be at least:
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15 years old.
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18 years old.
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21 years old.
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6.
Rust around wheel nuts may mean:
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It rained recently.
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The nuts are loose.
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The nuts are too tight.
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7.
Mirrors should be checked:
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Before every lane change.
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When changing lanes, but only when other vehicles are nearby.
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When changing lanes, but only if it is dark outside.
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