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






3. The 3 types of transformer power loss






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






5. A ___________ transformer is a continuously adjustable Autotransformer.






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






7. 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






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






9. both coils in this core are heavily insulated






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






11. For a step up and step down transformer if the turns ratio is constant this is the only way to change the output voltage






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






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






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






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






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






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






18. A stationary device for transferring alternating current electrical energy from one circuit to another circuit by electromagnetic means.






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






20. _____ currents are reduced by laminating the core.






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






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






23. 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






24. Central magnetic core made of






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






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






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






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






29. The 4 types of transformer cores






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






31. Two coils wound on a closed iron core form a ________.






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






33. The 3 principle components of a transformer






34. 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.






35. How coercivity is minimized






36. An instrument used to measure electrical current.






37. The simplest type of transformer core






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






39. 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.






40. Transformer losses are classified as _____ and _____.






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






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






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






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






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






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






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






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






49. Divergence of the magnetic field causes this






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






Can you answer 50 questions in 15 minutes?



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