Diagnostic Test For Electrician License Examination Preparation
Transformers - Single 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 efficiency of a single phase transformer where the primary power is 500 watts and the secondary power is 420 watts?
Question #2
What is the voltage output of a 10:1 transformer if the primary is 120 volts?
Question #3
What is the expected secondary current of a single phase transformer where the efficiency of 86%, there are 1120 turns in the primary, 260 turns in the secondary and the primary current if 6.8 amps?
Question #4
What is the secondary power of a single phase transformer where the input voltage is 240 volts, the output voltage is 120 volts, the primary current is 2.62 amps and the efficiency is 92.2%?
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.