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






2. A single electrical circuit.






3. 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






4. _____ shows that the voltamperes of the primary of a transformer equal the voltamperes of the secondary of a transformer.






5. The energy is always transferred without a change in frequency - but usually with changes in _____ and _____.






6. A designated limit of operating characteristics based on definite conditions.






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






8. The simplest type of transformer core






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






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






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






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






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






14. The shape of the core of the transformer ensures a ______________ for the magnetic flux with maximum concentration within the core and minimum leakage of the air






15. The current related to turns ratio law






16. Central magnetic core made of






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






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






19. 3 types of transformers






20. A ___________ transformer is a continuously adjustable Autotransformer.






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






22. 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






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






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






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






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






27. An instrument used to measure electrical current.






28. both coils in this core are heavily insulated






29. A simple design has a core within each coil






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






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






32. 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.






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






34. The 3 principle components of a transformer






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






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






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






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






39. Is concentrated in the metal core






40. What does transformer efficiency mean?






41. 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






42. Used to increase the magnetic flux in a transformer






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






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






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






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






47. 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.






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






49. How coercivity is minimized






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






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