Test your basic knowledge |

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. A transformer loses less than _% in energy






2. Reference to a jumper or conductor - to or from a piece of electrical equipment.






3. The 4 types of transformer cores






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






5. A transformer is a device that either increases or decreases alternating current and voltage using this principle






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






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






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






9. The turns of both windings are cut by the same flux; therefore the induced emf in each turn of both windings is the _____.






10. Is concentrated in the metal core






11. An instrument used to measure electrical current.






12. both coils in this core are heavily insulated






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






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






15. A variable transformer is a continuously adjustable _____ - has the primary winding and secondary winding electrically connected.






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






17. 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






18. The formula for the current related to voltage law






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






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






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






22. The entire transformer is placed in a metal tank then immersed in ________.






23. Transformer losses are classified as _____ and _____.






24. How coercivity is minimized






25. The simplest type of transformer core






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






27. When an alternating current is applied to the high-voltage (H) winding of a transformer with no load on the secondary (X) winding - a small current - called the _____ current - flows in the primary.






28. The current related to turns ratio law






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






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






31. A single electrical circuit.






32. An electromagnetic device that operates on the principle of self induction. It uses AC.






33. ___________ is often used in laminated cores - increases electrical resistance which decreases eddy currents






34. Waste of power known as transformer loss - often produced by closed-ended core






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






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






37. The winding to which voltage is supplied is called the _____ winding.






38. Modern; extremely efficient-more effective coupling between primary and secondary coils; smaller and lighter






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






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






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






42. With no load on the secondary winding - a small current flows in the primary called _____ _____.






43. Copper loss is known as _____ loss.






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






45. The winding to which the load is connected is called the _____ winding.






46. 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






47. The turns ratio between the windings (primary & secondary) of a transformer unless otherwise specified.






48. Used to increase the magnetic flux in a transformer






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






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







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