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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. To minimize ________ in transformer construction - the primary and secondary windings are placed on the same leg(s) of the core.






3. A single electrical circuit.






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






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






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






7. A choke coil uses this to induce current






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






9. 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.






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






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






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






13. 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.






14. Anything above 600 volts is _____?






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






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






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






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






19. Used to increase the magnetic flux in a transformer






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






21. 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.






22. 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 _____.






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






24. 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






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






26. Copper loss is known as _____ loss.






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






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






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






30. The simplest type of transformer core






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






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






33. Transformer losses are classified as _____ and _____.






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






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






36. 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.






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






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






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






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






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






42. A transformer loses less than _% in energy






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






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






45. A simple design has a core within each coil






46. 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)






47. both coils in this core are heavily insulated






48. 3 types of transformers






49. What does transformer efficiency mean?






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







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