Our test is about half theory and about half questions that arise in the field. We use the test to weed out pretenders and to justify the pay scale the tech is asking for. Some examples of theory questions are: Define superheat and subcooling? An example of a practical knowledge question is: What information would you need to replace a condenser fan motor? There we're looking for voltage, RPM, frame, air over or enclosed, etc. We do a lot of "antique restoration" and can't get OEM parts for a lot of that stuff. Here's the simple question that trips up way too many people: How many amps can be drawn off a 48va transformer with a 120 volt primary and a 24v secondary on an ordinary gas furnace?
Let's see what kind of answers I get.