You can buy one, you just can't operate it.
A bobtail can be driven with a Class B CDL, but if you're driving tractor-trailers for a living, you'd have a Class A CDL, anyhow.
Class A CDL (without a "no tractor-trailers" restriction) in the US, E+C in South Africa, EC in the European Union.
Yes, but you can't drive it.
If you don't have a valid DOT physical, your CDL is null and void. The only exemptions to CDL requirements are farm vehicles, military vehicles, emergency vehicles, and recreational vehicles, within the conditions specified for those exemptions.
To drive a semi truck, you need a specific driving license that allows you to drive that class of vehicle. As well, as proper education and training such as driver's ed.
Yes, you would. Without the trailer, you could operate it with either a Class A or Class B CDL.
You would have to explain what state your licence is from, and whether or not that's a restriction code. To drive a semi, you would need a Class A CDL (unless it's a registered farm vehicle, exempt from CDL requirements, in which case, your state is free to establish their own licencing requirements). I know in North Carolina, a "No tractor trailer" restriction on a Class A CDL was an "8" restriction. Taking a quick glance, I can see that 57 is a CDL restriction code in Tennessee. If TN is your state, then your answer would be no - 57 is the "except tractor-trailer" restriction code for that state.
The only way you could do this is if it were already registered as a farm vehicle, the distance of the dealership from the farm was 150 miles or less, and you are the farmer, an immediate family member of the farmer, or a direct employee of the farmer. Otherwise, it's considered a commercial vehicle under FMCSR, and requires a CDL.
Out of service, heavy fines, vehicle impounded.
no
A commercial drivers license or CDL is required to drive semi trucks, tractor trailers, and eighteen-wheelers. Most companies will require a minimum amount of experience or graduation from a truck driving school. Each state has slightly different requirements for their CDL so make sure you check your own state's requirements.
Yes. That's a pretty big ticket.