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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 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






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






3. Copper loss is known as _____ loss.






4. Central magnetic core made of






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






6. The current related to turns ratio law






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






8. The formula for the voltage related to turns ratio






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






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






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






12. 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.






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






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






15. What is a rotation meter?






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






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






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






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






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






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






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






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






24. 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)






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






26. Used to increase the magnetic flux in a transformer






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






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






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






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






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






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






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






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






35. 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.






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






37. Divergence of the magnetic field causes this






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






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






40. The 3 principle components of a transformer






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






42. A transformer loses less than _% in energy






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






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






45. How coercivity is minimized






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






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






48. 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






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






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







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