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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 ___________ transformer is a continuously adjustable Autotransformer.






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






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






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






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






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






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






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






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






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






11. 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.






12. Central magnetic core made of






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






14. 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






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






16. 3 types of transformers






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






18. What does transformer efficiency mean?






19. Anything above 600 volts is _____?






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






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






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






24. both coils in this core are heavily insulated






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






26. The simplest type of transformer core






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






28. The capacity of a transformer is rated in ____ _____.






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






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






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






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






33. Is concentrated in the metal core






34. _____ currents are reduced by laminating the core.






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






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






37. 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.






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






39. The current related to turns ratio law






40. A transformer loses less than _% in energy






41. The 3 principle components of a transformer






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






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






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






45. Copper loss is known as _____ loss.






46. 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






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






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






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






50. 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.







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