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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. _____ currents are reduced by laminating the core.






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






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






4. The magnetic lines of force that flow from the north pole of a magnet and return to the south pole.






5. Transformer losses are classified as _____ and _____.






6. The 3 types of transformer power loss






7. 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.






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






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






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






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






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






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






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






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






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






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






18. Divergence of the magnetic field causes this






19. The transformer winding to which the load is connected is called the _____ winding.






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






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






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






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






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






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






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






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






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






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






30. An instrument used to measure electrical current.






31. A simple design has a core within each coil






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






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






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






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






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






37. A choke coil uses this to induce current






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






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






40. Anything above 600 volts is _____?






41. The 4 types of transformer cores






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






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






44. 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.






45. 3 types of transformers






46. 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.






47. 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.






48. Central magnetic core made of






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






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







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