Test your basic knowledge |

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






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






3. 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.






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






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






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






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






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






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






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






12. Function of the dielectric oil






13. A single electrical circuit.






14. Used to increase the magnetic flux in a transformer






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






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






17. A simple design has a core within each coil






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






19. Is concentrated in the metal core






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






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






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






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






24. 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.






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






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






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






28. 3 types of transformers






29. An instrument used to measure electrical current.






30. The 3 types of transformer power loss






31. Central magnetic core made of






32. 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






33. 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






34. A transformer primary (H) that has 400 turns is wound to step the voltage down from 240 volts to 120 volts. The number or turns (TX) required in the secondary (X) winding is _____.






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






36. both coils in this core are heavily insulated






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






38. The current related to turns ratio law






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






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






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






42. Waste of power known as transformer loss - often produced by closed-ended core






43. 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)






44. The simplest type of transformer core






45. A transformer loses less than _% in energy






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






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






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






49. How coercivity is minimized






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







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