General Knowledge and Combination Vehicles, in all instances. Air Brakes if applicable... it is possible to need a Class A and not need to be authorized for air brakes (for example, something like a Ford F650/F750 with hydraulic brakes pulling a gooseneck trailer with electrically actuated hydraulic brakes). Plus any endorsements you want/need.
for basic general knowledge, class B, test, there are 50 questions
Yes
Take the written air brakes test, and perform a road test in a combination requiring a Class A CDL which is equipped with air brakes.
Depends on what class of CDL you're going for, among other things.
They're all in the CDL handbook. Study it, learn it. If you're not competent enough to do that, you have no business holding a CDL.
General Knowledge, Combination Vehicles, Air Brakes (if applicable), plus a pretrip and road test
The class of the Commercial Drivers License , A, B or C refers to the weight of the vehicle. When a person gets a CDL, they take the General Knowledge test.
Take and pass the written passenger test, and do a road test in a passenger vehicle. If you take your road test in a bus under 26,000 GVWR, you'll be restricted to passenger vehicles requiring a Class C CDL. If you take your road test in a single vehicle over 26,000 GVWR, you'll be restricted to operating passenger vehicles requiring a Class B or Class C CDL. You're really not going to find any Class A CDL passenger vehicles.
Depends on what class of CDL you're going for. You have to take the General Knowledge test for any class. Air Brakes if applicable. Combination Vehicles if you're going for Class A, plus any endorsements you'll need. Figure on an average of about 40 questions per test.
Absolutely. It just has to be a vehicle requiring a Class B CDL - nowhere does it say that it has to be a dump truck, roll-off, etc.
If it's just the power unit, with no trailer attached, they can do it with a Class B. But they must have a CDL to take that vehicle on a public roadway.
All you have to do to get the endorsement is pass the written test and road test in a passenger vehicle. However, if you have a Class A CDL and road test in a vehicle requiring only a Class C CDL, you'll be restricted to operating passenger vehicles in that class and lower.