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






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






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






4. The 3 types of transformer power loss






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






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






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






8. The output rating of a transformer is based upon the maximum _____ the transformer is capable of carrying without exceeding a certain temperature rise.






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






10. 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.






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






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






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






14. The current related to turns ratio law






15. What is a rotation meter?






16. A transformer loses less than _% in energy






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






18. Provides the ratio between the applied primary voltage and the induced secondary voltage as result of the turns ratio






19. Transformer losses are classified as _____ and _____.






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






21. 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.






22. The number of turns can be adjusted in these types of transformers






23. The transformer winding to which voltage is supplied is called the _____ winding.






24. A transformer is a device that either increases or decreases alternating current and voltage using this principle






25. Used to increase the magnetic flux in a transformer






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






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






28. This core is more efficient than the air core because the iron core in each coil intensifies the magnetic flux in both primary and secondary coils when they become magnetized as current flows through each set of coils






29. The formula for the voltage related to turns ratio






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






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






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






33. An instrument used to measure electrical current.






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






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






36. How coercivity is minimized






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






38. 3 types of transformers






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






40. The simplest type of transformer core






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






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






43. The formula for the current related to voltage law






44. The 4 types of transformer cores






45. The shape of the core of the transformer ensures a ______________ for the magnetic flux with maximum concentration within the core and minimum leakage of the air






46. 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.






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






48. ___________ is often used in laminated cores - increases electrical resistance which decreases eddy currents






49. 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.






50. Divergence of the magnetic field causes this







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