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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. A simple design has a core within each coil






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






3. both coils in this core are heavily insulated






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






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






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






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






8. Copper loss is known as _____ loss.






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






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. How coercivity is minimized






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






13. 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






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






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






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






17. 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 _____.






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






19. 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






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






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






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






23. 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.






24. The 3 types of transformer power loss






25. The current related to turns ratio law






26. 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.






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






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






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






30. 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.






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






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






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






34. An instrument used to measure electrical current.






35. The formula for the current related to voltage law






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






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






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






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






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






41. A ___________ transformer is a continuously adjustable Autotransformer.






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






43. A single electrical circuit.






44. Is concentrated in the metal core






45. 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.






46. The 4 types of transformer cores






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






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






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






50. What does transformer efficiency mean?







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