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Industrial Electrical Transformer Principles

Subjects : engineering, ib
Instructions:
  • Answer 12 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. The connection of transformer to form a 'Y' configuration. 'Y' connections can be made by connecting either the even terminals or the odd terminals together.






2. The effects of inductance are mutual between the primary and secondary. The current in the primary induces a voltage in the secondary.






3. The multiplier from line to neutral in a 3- phase transformer. Example: A 3- phase 'Y' to neutral--208 volts divided by 1.73 equals 120 volts.






4. The result of the energy wasted in reversing the magnetization of the core every time the current reverses and magnetizes the core in a different direction






5. Polarity where the HI marking is opposite the X2 marking and the H2 marking is opposite the X1 marking.






6. The connection of a transformer to form a 'A' configuration. Delta connections can be made by connecting odd to even terminals.






7. Efficiency is always the ratio of output to input. It is the ratio of true (output power) to apparent (input power).






8. A system of (ANSI) markings of the transformer leads. The high voltage leads are 'H' leads and the low voltage leads are 'X' leads.






9. (+) = Positive and (-) = Negative. Also see Transformer Polarity.






10. The primary winding is the winding that is connected to the source voltage. It does not necessarily have to be the high voltage winding.






11. The rating of a transformer in kilovolt- amps.






12. The winding that is connected to the load. It does not necessarily have to be the low voltage winding.