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. _____ currents are reduced by laminating the core.






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






3. Divergence of the magnetic field causes this






4. A ___________ transformer is a continuously adjustable Autotransformer.






5. 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






6. Is concentrated in the metal core






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






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






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






10. The current related to turns ratio law






11. 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)






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






13. Copper loss is known as _____ loss.






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






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






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






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






18. The loss of power required to reverse the core magnatism each time the current reverses. This loss is caused by friction between the molecules of iron as these particles are aligned first in one direction and the in the opposite direct as current dir






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






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






21. both coils in this core are heavily insulated






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






23. The 3 principle components of a transformer






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






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






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






27. The formula for the current related to voltage law






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






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






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






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






32. It refers to the direction of current flow in a closed circuit.






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






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






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






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






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






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






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






40. Anything above 600 volts is _____?






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






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






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






44. Function of the dielectric oil






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






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






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






48. The voltage induced in the coil is directly proportional to this






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






50. What does transformer efficiency mean?







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