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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 simple design has a core within each coil






2. The current related to turns ratio law






3. 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)






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






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






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






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






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






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






10. 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.






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






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






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






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






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






16. A ___________ transformer is a continuously adjustable Autotransformer.






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






18. The formula for the current related to voltage law






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






20. 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






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






22. 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






23. Copper loss is known as _____ loss.






24. Divergence of the magnetic field causes this






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






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






27. closed core with a top and bottom. It directs the magnetic field towards the primary and secondary coils and increases the field stregnth






28. _____ currents are reduced by laminating the core.






29. Used to increase the magnetic flux in a transformer






30. 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






31. The 3 types of transformer power loss






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






33. 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






34. 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.






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






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






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






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






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






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






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






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






43. 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






44. 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.






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






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






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






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






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






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







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