Diagnostic Test For Electrician License Examination Preparation
Motors - Three Phase
Time Limit for This Page: 24 minutes
References Permitted: National Electrical CodeŽ, American Electrician's Handbook
Appropriate for Journeyman Electrician, Master Electrician and Electrical Inspector Exams.
Question #1
What is the full load current (flc) of a three phase 15 HP 208 volt motor?
Question #2
What is the smallest allowable THWN copper conductor to supply a 3 HP three phase 240 volt motor located adjacent to the power source?
Question #3
What is the smallest TW copper feeder for four 5 HP 208 volt 3 phase motors if the voltage drop is ignored?
Question #4
What is the maximum inverse time overcurrrent protective device for a 10 HP 460 volt 3 phase motor?
Upon completion, use any remaining time to make sure you have the right answers. When time has expired, go to the answer page to check your answers with the given answers.
Click HERE for ANSWERS TO DIAGNOSTIC TESTS.
If you did not score three correct in the time allowed, then you might want to consider exam preparation with the help of the David U. Larson workbook:
Click HERE for INFO ABOUT Calculations Workbooks for Electrician License Examinations.