Why we do open circuit test?? Warning: Trying to access array offset on false in /home3/indiakep/public_html/wp-content/plugins/dw-question-answer/inc/Template.php on line 8 All Questions › Category: Electrical Machines › Why we do open circuit test?? 0 Vote Up Vote Down Akash Tiwari asked 6 years ago 1 Answers 0 Vote Up Vote Down Akash Tiwari answered 6 years ago 1) To determine no load loss and core loss. 2) To find no load current. 3) The efficiency of machine.