That depends on what class of CDL you're going for.
For a Class A CDL, you'll need to study General Knowledge, Combination Vehicles, and air brakes if applicable.
For a Class B CDL, you'll need to study General Knowledge and air brakes if applicable.
For a Class C CDL, you'll need to study General Knowledge, air brakes if applicable, and either Hazardous Materials or Passenger Vehicles since the only instance in which you'd obtain a Class C CDL is if you were operating a vehicle under 26,001 lbs. GVWR which was either hauling hazardous materials or else was a bus designed to transport more than 15 persons (including the driver).
Any endorsements you'd need will also have to be studied (e.g., hazmat, tanker, doubles and triples, passenger vehicles).
People will not be able to locate the answers to the Ca CDL permit test online. They will have to study the manual to know the answers.
The air brakes portion of your CDL handbook.
Your CDL permit is in addition to the class of licence you had beforehand. So long as you were licenced to drive a car before you got your CDL permit, you can drive your own car while you possess a CDL permit.
What type of permit? A CDL permit is, yes. A regular learner's permit is not. As with a full CDL, you're required to maintain a current DOT medical card with a CDL permit.
In order to obtain a CDL permit, you have to pass a driving test and get your license. When you get your license for a CDL permit, then you will be ble to drive trailer trucks and/or buses whenever you want to.
Yes. Aside from the CDL permit, it's a regular license.
Sure you can - but not as a CDL driver.
You're going to have to pay for the permit... no two ways about it. If you take the written tests, the only thing you'll have to pay for until you get an actual CDL is the permit itself, and you can take those tests at the DMV - you don't have to go to a truck driving school for that.
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As much as your state charges... CDL requirements are federally regulated, but prices are not. All you have to do to upgrade to an "A" permit is take the combination vehicles written test and pay the fee.
It costs roughly $150 to get your CDL. If you go to a trucking school there are many companies that will pay for not only your CDL but your school as well.
Get the CDL handbook and study it.