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Electrical Engineering

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. Similar to switchgear except for use in low voltage versus medium voltage applications. used to supply power to motor control centers and large individual low voltage motors in some applications.






2. A material that is usually insulated but becomes conductive through the addition of an impurity






3. Building blocks of elements consisting of a positively charged nucleus surrounded by electrons






4. Used to isolate equipment but are typically not designed to be opened or closed while the circuit is energized (i.e. they're not designed to interrupt current). Also used in switchyard to isolate equipment






5. Main Generator feeds main transformer - aux transformer (to aux loads) and crosstie to train B






6. The instantaneous movement from negatively charged atoms to positively charged atoms






7. Neutral charged particles of an atom






8. A mechanical switching device used to either enable or interrupt current flow in a circuit. Typically provides both overload and fault protection. Is similar to a fuse; however - can be reset and reused.






9. The product of voltage times current






10. A material that has no resistance to electrical current - this usually occurs near absolute zero






11. Is measured in watts and represents the power consumed by the resistive elements in an AC circuit






12. Atoms that have acquired an electrical charge






13. 125 and 250 VDC.






14. Voltage is stepped down again to serve smaller industrial and commercial customers as well as residential needs.






15. Any path that electrons flow through






16. The source voltage is equal to the sum of the voltage drops across the elements of the circuit and the load.

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17. The flow of electrons






18. Used in numerous applications to amplify or perform switching operations.






19. The flow of electrons (-) through a material






20. (analogous to flow) predominantly flows on the surface of the conductor.






21. An assembly of low voltage circuit breakers and/or starters used to supply individual loads of small to moderate sizes. Each feeder circuit is typically contained in a separate compartment or bucket.






22. The power output from the plant is stepped up in voltage to match the grid voltage. Transformers that are used to provide offsite power to the plant (e.g. when the generator is off-line) step down the voltage.






23. An electrode where reduction occurs






24. Are used to provide low voltage circuits for use in metering - monitoring - and protective relaying applications. The turns ratio of the transformer determines the low voltage rating as a function of the system voltage - and is often selected to be 1






25. An assembly of circuit breakers typically used to supply power to large motors and medium or low voltage transformers within the auxiliary power system. Each breaker is contained in a separate cubicle along with associated current transformers - and






26. Negatively charged particles of an atom






27. A voltage source that does not change polarity such as that delivered from a battery.






28. V=IR.

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29. Changes the voltage of electricity so that it can be transferred over long distances






30. A material through which a charge does not move easily






31. A material that dissolves in water producing a solution that conducts electricity






32. Temperature Controlled






33. Requires - in part - that (1) electric power from the transmission network to the onsite distribution system shall be supplied by two physically independent circuits (not necessarily on separate rights of way) designed and located so as to minimize t






34. A device that changes mechanical energy into electricity






35. Unit's main generator - offsite power via the switchyard - and redundant emergency diesel generators






36. Total Current entering a junction must equal current leaving a junction

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37. An energy storage device that converts chemical energy to electricity when power is needed.






38. Voltage Source - Conductor - Switch - Load






39. An electrode where free electrons are produced






40. Is a configuration used for very high current bus assemblies typically operating at generator voltage levels of 20 to 24 kV where each conductor is mounted within its own enclosure.






41. protect your eyes and clothing. air must be circulated through the battery rooms with large stationary batteries to prevent a build-up of a combustible mixture.System cannot be grounded. First ground should do nothing.






42. A circuit with a complete path - which allows for charges to move






43. Nuclear fuel is used to produce heat which is used to create steam. The steam is used to spin the turbine. The turbine shaft is connected to the generator rotor. The mechanical energy is converted to electrical energy through the generator.






44. Changes in voltage caused by motor starts or other loads being switched onto an electrical system






45. Offsite power comes in via sartup transformer and some sites can backfeed power from grid via the main transformer OR even a crosstie






46. A circuit with a break in its path






47. Represents the power transferred to or from capacitive and inductive elements in an AC circuit and is measured in volt-amperes reactive. Voltage and current are 90






48. A material in which charge moves through easily






49. Operate somewhat like check valves such that current only flows in one direction - when the voltage on the input is higher than the output






50. The path of an electron in an atom or molecule







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