Anywhere from 10 to 100, but 20 is common.
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Rule of thumb, about 20 questions per section. How many questions that comes to total depends on your class of CDL and endorsements you're going for. For all classes, you'll have to take General Knowledge. If it's going to be an air brake equipped vehicle, you'll have to take air brakes (and perform your road test in a vehicle so equipped). If you're going for a Class A, you'll have to take Combination Vehicles. Then there's your endorsements... double/triple trailers, hazardous materials, passenger, tanker..
132 questions.
50
145
you can get either 80 questions in the test or u can have 85