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






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






3. What does transformer efficiency mean?






4. Copper loss is known as _____ loss.






5. _____ currents are reduced by laminating the core.






6. 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.






7. The 4 types of transformer cores






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






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






10. 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.






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






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






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






14. A transformer rated at 500KVA and below used for voltage transformation on the distribuition system.






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






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






17. A ___________ transformer is a continuously adjustable Autotransformer.






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






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






20. How the voltage and the number of turns are related for the voltage related to turn ratio






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






22. Used to increase the magnetic flux in a transformer






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






24. Connected to earth or to some conducting body which serves in place of the earth.






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






26. Is concentrated in the metal core






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






28. Insulated primary and secondary coils are in close proximity to each other - no iron core and very innefficient






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






30. How coercivity is minimized






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






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






33. 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.






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






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






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






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






38. The simplest type of transformer core






39. A transformer loses less than _% in energy






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






41. The 3 principle components of a transformer






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






43. 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






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






45. both coils in this core are heavily insulated






46. The formula for the current related to voltage law






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






48. The formula for the voltage related to turns ratio






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






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







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