The purpose of using flux when soldering is to: A. anneal the surface. B. give better heat flow. C. reduce oxidation. D. pre-seal the oxidation. {Ans: C. reduce oxidation.}A system supply airflow check is used to diagnose: A. humidity problems. B. compressor overheating. C. restricted liquid line drier D. condenser fan motor overheating. {Ans: A. humidity problems.}The following conditions exist in a circuit that supplies power to three phase parallel loads. *One load is resistive, *One load is capacitive, *One load is inductive The total current in the circuit when operating will be: A. the resistive current plus the inductive current minus the capacitive current. B. the resistive current alone since the inductive current will always be cancelled by the capacitive current. C. the average of the currents flowing through each load. D. the sum of the currents through each load. {Ans: D. the sum of the currents through each load.}How would a technician repair a 1" hole in a section of duct board? A. Cut out the hole, and fabricate, staple and tape a plug in place to fill the hole B. Cut out the hole and fabricate and tape a plug in place to fill