Why we do open circuit test?? All Questions › Category: Electrical Machines › Why we do open circuit test?? 0 Vote Up Vote Down Akash Tiwari asked 4 years ago 1 Answers 0 Vote Up Vote Down Akash Tiwari answered 4 years ago 1) To determine no load loss and core loss. 2) To find no load current. 3) The efficiency of machine.