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






2. closed core with a top and bottom. It directs the magnetic field towards the primary and secondary coils and increases the field stregnth






3. A system of conductors in which at least one conductors or point (usually the middle wire or neutral point of a transformer or generator windings) is intentionally grounded either solididly or through a current-limiting device.






4. The output which can be delivered for the time specified at rated secondary voltage and rated frequency without exceeding the specified temperature limitations.






5. An instrument used to measure electrical current.






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






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






8. has a laminated iron core (layers of metal plates)






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






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






11. Central magnetic core made of






12. 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






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






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






15. The simplest type of transformer core






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






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






18. The formula for the current related to voltage law






19. 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






20. 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.






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






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






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






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






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






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






27. This type of transformer power loss is caused by the continually changing AC current movement which constantly magnetizes/demagnetizes/re-magnetizes






28. 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






29. Divergence of the magnetic field causes this






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






31. The formula for the voltage related to turns ratio






32. 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 _____.






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






34. A ___________ transformer is a continuously adjustable Autotransformer.






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






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






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






38. A simple design has a core within each coil






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






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






41. A choke coil uses this to induce current






42. Used to increase the magnetic flux in a transformer






43. A transformer which when supplied from a constant potential source automatically maintans a constant current in its secondary circuit under varying conditions of load impedance. Used on series street light circuits.






44. Copper loss is known as _____ loss.






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






46. The current flowing through the primary winding - in response to the applied primary voltage - sets this up






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






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






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






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







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