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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 number of turns can be adjusted in these types of transformers






2. A ___________ transformer is a continuously adjustable Autotransformer.






3. The turns of both windings are cut by the same flux; therefore the induced emf in each turn of both windings is the _____.






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






5. 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






6. Divergence of the magnetic field causes this






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






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






9. The 3 principle components of a transformer






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






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






12. 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






13. A transformer loses less than _% in energy






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






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






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






17. 3 types of transformers






18. Transformers with 4800 volt primaries and 120/240 volt secondaries - either pole or subway type - with two secondary windings terminating at internal links which provide for parallel operation of the secondary windings at 120 volts or series operatio






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






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






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






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






23. A simple design has a core within each coil






24. The current related to turns ratio law






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






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






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






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






29. An instrument used to measure electrical current.






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






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






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






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






34. 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.






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






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






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






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






39. 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.






40. How coercivity is minimized






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






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






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






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






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






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






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






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






50. The formula for the voltage related to turns ratio






Can you answer 50 questions in 15 minutes?



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