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






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






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






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






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






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






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






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






10. Central magnetic core made of






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






12. 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.






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






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






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






16. Is concentrated in the metal core






17. Transformers with 4800 volt primaries and 120/240 volt secondaries - either pole or subway type - with two secondary windings terminating at internal links which provide for parallel operation of the secondary windings at 120 volts or series operatio






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






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






20. A ___________ transformer is a continuously adjustable Autotransformer.






21. What is a rotation meter?






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






23. The 3 types of transformer power loss






24. _____ currents are reduced by laminating the core.






25. The formula for the voltage related to turns ratio






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






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






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






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






30. Copper loss is known as _____ loss.






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






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






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






34. An instrument used to measure electrical current.






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






36. Function of the dielectric oil






37. The 3 principle components of a transformer






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






39. both coils in this core are heavily insulated






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






41. 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






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






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






44. Anything above 600 volts is _____?






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






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






47. The current related to turns ratio law






48. What does transformer efficiency mean?






49. How coercivity is minimized






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







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