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






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






3. Copper loss is known as _____ loss.






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






5. This is the most advanced and most efficient type of tansformer; it is commonly used in x-ray equipment






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






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






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






9. 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






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. 3 types of transformers






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






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






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






15. 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






16. What is a rotation meter?






17. both coils in this core are heavily insulated






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






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






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






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






22. Used to increase the magnetic flux in a transformer






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






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






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






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






27. 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.






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






29. Is concentrated in the metal core






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






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






33. A stationary device for transferring alternating current electrical energy from one circuit to another circuit by electromagnetic means.






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






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






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






37. 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






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






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






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






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






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






43. The 3 types of transformer power loss






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






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






46. A transformer loses less than _% in energy






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






48. 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.






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






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







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