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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. The current related to turns ratio law






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






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






5. both coils in this core are heavily insulated






6. 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)






7. An instrument used to measure electrical current.






8. The magnetic lines of force that flow from the north pole of a magnet and return to the south pole.






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






10. The characteristic that requires energy to carry out the constant reorientation of the magnetic dipoles in the hysteresis loss






11. The capacity of a transformer is rated in ____ _____.






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






13. Anything above 600 volts is _____?






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






15. How a variable degree of core saturation is accomplished in a saturable reactor?






16. A magnet made by winding a coil of wire around a soft iron core. Current passed through this winding produces magnetic lines of force in the coil.






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






18. 3 types of transformers






19. Defined as the ratio of the power output to the power input (in a closed circuit containing resistance)






20. The relationship between current and voltage in the coils are inverse






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






22. The formula for the voltage related to turns ratio






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






24. Modern; used to control filament circuit; replaced both the rheostat and choke coil; operated on the electromagnetic principle that if an iron core within or near a coil is saturated with magnetic flux by an independed source of direct current - the






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






26. The total numbre of lines or force issuing from a pole. (north or south)






27. Used to increase the magnetic flux in a transformer






28. An abnormal connection of relative low resistance - whether made accidentally or intentionally - between two point of different potential in a circuit.






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






30. A transformer is a device that has no moving parts and that transfers energy from one circuit to another by _____.






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






32. If the transformer is used as a _____ transformer - the low voltage winding is the primary.






33. The 3 principle components of a transformer






34. _____ currents are reduced by laminating the core.






35. What is a rotation meter?






36. 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






37. A partial or total local failure in the insulation or continuity of a conductor.






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






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






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






41. Is concentrated in the metal core






42. 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






43. A ___________ transformer is a continuously adjustable Autotransformer.






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






45. The simplest type of transformer core






46. A part of a circuit made of a low melting point material so that it will melt and break the circuit when a specified current exceeded. Always the weakest point in the circuit.






47. 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 _____.






48. What does transformer efficiency mean?






49. The number of turns can be adjusted in these types of transformers






50. Some losses occur in all transformers. These losses are classified as copper losses and _____ losses.







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