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. Copper loss is known as _____ loss.






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






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






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






5. Some losses occur in all transformers. These losses are classified as copper losses and _____ losses.






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






7. The capacity of a transformer is rated in ____ _____.






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






9. Is concentrated in the metal core






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






11. Transformer losses are classified as _____ and _____.






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






13. 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 _____.






14. The formula for the voltage related to turns ratio






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






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






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






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






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






20. The 3 principle components of a transformer






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






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






23. Function of the dielectric oil






24. 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






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






26. Central magnetic core made of






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






29. A single electrical circuit.






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






31. 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.






32. 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.






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






34. What does transformer efficiency mean?






35. Used to increase the magnetic flux in a transformer






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






37. The simplest type of transformer core






38. Divergence of the magnetic field causes this






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






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






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






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






43. _____ currents are reduced by laminating the core.






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






45. The 4 types of transformer cores






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






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






48. 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






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






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







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