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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. Anything above 600 volts is _____?






2. 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)






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






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






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






6. The current flowing through the primary winding - in response to the applied primary voltage - sets this up






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






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






9. The 3 principle components of a transformer






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






11. Current flows through the primary winding in response to primary voltage and sets up a magnetic field that varies in direction and stregnth. under the influence of the changing magnetic field an AC voltage/kv is induced across the secondary coil by e






12. An instrument used to measure electrical current.






13. Modern; extremely efficient-more effective coupling between primary and secondary coils; smaller and lighter






14. A ___________ transformer is a continuously adjustable Autotransformer.






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






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






17. The 4 types of transformer cores






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






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






20. 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






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






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






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






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






25. The simplest type of transformer core






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






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






28. 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.






29. 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






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






31. An abnormal connection of relative low resistance - whether made accidentally or intentionally - between two point of different potential in a circuit.






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






33. Divergence of the magnetic field causes this






34. 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.






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






36. Function of the dielectric oil






37. How coercivity is minimized






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






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






40. What does transformer efficiency mean?






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






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






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






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






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






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






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






48. Copper loss is known as _____ loss.






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






50. Is concentrated in the metal core







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