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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 4 types of transformer cores






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






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






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






5. Function of the dielectric oil






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






7. Divergence of the magnetic field causes this






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






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






10. To minimize ________ in transformer construction - the primary and secondary windings are placed on the same leg(s) of the core.






11. Anything above 600 volts is _____?






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






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






14. The 3 principle components of a transformer






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






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






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






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






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






20. A part of a circuit made of a low melting point material so that it will melt and break the circuit when a specified current exceeded. Always the weakest point in the circuit.






21. Is concentrated in the metal core






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






23. Transformer losses are classified as _____ and _____.






24. _____ currents are reduced by laminating the core.






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






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






27. 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.






28. The current related to turns ratio law






29. A simple design has a core within each coil






30. 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.






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






32. The simplest type of transformer core






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






34. An abnormal connection of relative low resistance - whether made accidentally or intentionally - between two point of different potential in a circuit.






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






36. 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






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






38. 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)






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






40. Used to increase the magnetic flux in a transformer






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






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






43. What is a rotation meter?






44. A ___________ transformer is a continuously adjustable Autotransformer.






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






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






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






48. What does transformer efficiency mean?






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






50. 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






Can you answer 50 questions in 15 minutes?



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