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Transformers

Subject : engineering
Instructions:
  • Answer 50 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. Central magnetic core made of






2. Provides the ratio between the applied primary voltage and the induced secondary voltage as result of the turns ratio






3. Instrument transformers reduce high voltages and currents to safe - usable values for the operation of _____ equipment.






4. Hysteresis Loss can be reduced by using a core with this feature






5. The shape of the core of the transformer ensures a ______________ for the magnetic flux with maximum concentration within the core and minimum leakage of the air






6. A simple design has a core within each coil






7. In a transformer the _____ current will always flow in such a direction that its magnetizing action will oppose the magnetizing action of the primary winding.






8. The 4 types of transformer cores






9. Function of the dielectric oil






10. A designated limit of operating characteristics based on definite conditions.






11. This type of core is moderately efficient due to closing the core and layering design which reduces power loss from less leakage flux which provides a continuous path for magnetic flux and an increase in field strength






12. The formula for the voltage related to turns ratio






13. The output rating of a transformer is based upon the maximum _____ the transformer is capable of carrying without exceeding a certain temperature rise.






14. A large amount of power wasted with the open-ended core






15. What is a rotation meter?






16. _____ shows that the voltamperes of the primary of a transformer equal the voltamperes of the secondary of a transformer.






17. Refers to the transformer's ability to avoid power loss (heat)






18. The transformer winding to which voltage is supplied is called the _____ winding.






19. The 3 types of transformer power loss






20. The terminals of the high voltage winding are marked _____.






21. The winding of a transformer to which electrical energy is supplied.






22. Autotransformers are not safe when they supply a _____ voltage from a high voltage source.






23. If the transformer is used as a _____ transformer - the high voltage winding is the primary.






24. The relationship between amperage flowing through the coils and the number of turns on individual coils is inverse






25. A transformer primary (H) that has 400 turns is wound to step the voltage down from 240 volts to 120 volts. The number or turns (TX) required in the secondary (X) winding is _____.






26. Determines if the transformer is a step up or step down transformer






27. The transformer winding to which the load is connected is called the _____ winding.






28. How coils serve as the primary and secondary windings for an autotransformer






29. The output side it develops AC by electromagnetic mutual induction - Secondary voltage is induced in this coil






30. Core losses are _____ loss and _____ - _____ loss.






31. The volt-amperes of the primary of a transformer is equal to the _____ - _____ output of the transformer.






32. This core is more efficient than the air core because the iron core in each coil intensifies the magnetic flux in both primary and secondary coils when they become magnetized as current flows through each set of coils






33. Current flows through the primary winding in response to primary voltage and sets up a magnetic field that varies in direction and stregnth. under the influence of the changing magnetic field an AC voltage/kv is induced across the secondary coil by e






34. Transformers designed for 4800 volt primary operation - but the secondaries are connected 240/480 volts. Winding ratio is 10:1






35. This is the most advanced and most efficient type of tansformer; it is commonly used in x-ray equipment






36. The terminals of the low voltage winding are marked _____.






37. _____ currents are reduced by laminating the core.






38. Kind of wire is the secondary coil in a transformer






39. The voltage induced in the coil is directly proportional to this






40. A test instrument used to indicate low voltage potentials in the range of 110 to 600 volts either alternating or direct current. (slang term: wiggy)






41. Is concentrated in the metal core






42. The current related to turns ratio law






43. Both the primary and secondary coils in a transformer are arranged around this






44. A magnetic field changing with respect to the conductor will generate a _____ in the conductor.






45. To prevent injury to personnel when servicing any equipment connected to a current transformer - the secondary winding must be ____ - _____.






46. Instrument transformers reduce high voltages and currents to safe - usable values for the operation of _____ _____.






47. The energy is always transferred without a change in frequency - but usually with changes in _____ and _____.






48. _____ shows that the voltages across the windings of a transformer are directly proportional to the turns in each winding.






49. The input side that attaches to the AC supply it recieves the electrical energy or incoming voltage






50. What does transformer efficiency mean?







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