After the refrigerant has been charged into the air-conditioning system, rotate the compressor shaft by hand to push out any __ that may have entered the compressor during the charge process. Select one: a. Air bubbles b. Dust c. Debris d. Liquid

The correct answer is a. Air bubbles.<br /><br />When charging a refrigerant into an air-conditioning system, it is important to rotate the compressor shaft by hand to push out any air bubbles that may have entered the compressor during the charge process. Air bubbles can cause issues with the proper functioning of the air-conditioning system, as they can interfere with the refrigerant flow and reduce the efficiency of the cooling process. By rotating the compressor shaft, any air bubbles that may have entered the compressor can be pushed out, ensuring that the refrigerant can flow properly through the system.