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






2. 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






3. 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.






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






5. The simplest type of transformer core






6. Two coils wound on a closed iron core form a ________.






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






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






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






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






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






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






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






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






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






16. Refers to the transformer's ability to avoid power loss (heat)






17. Copper loss is known as _____ loss.






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






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






20. A transformer loses less than _% in energy






21. 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.






22. 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






23. The 3 types of transformer power loss






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






26. An instrument used to measure electrical current.






27. 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)






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






29. Function of the dielectric oil






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






31. A ___________ transformer is a continuously adjustable Autotransformer.






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






33. both coils in this core are heavily insulated






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






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






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






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






38. Transformers with 4800 volt primaries and 120/240 volt secondaries - either pole or subway type - with two secondary windings terminating at internal links which provide for parallel operation of the secondary windings at 120 volts or series operatio






39. A single electrical circuit.






40. What is a rotation meter?






41. Used to increase the magnetic flux in a transformer






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






43. The formula for the current related to voltage law






44. 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.






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






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






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






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






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






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







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