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Electrical Engineering

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. May be used to power various low voltage loads and are typically used for applications that do not require any form of remote control.






2. 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.






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






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






5. Negatively charged particles of an atom






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






7. V=IR.

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8. Atoms that have acquired an electrical charge






9. 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.






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






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






12. Large battery - a battery charger - and a distribution panel






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






14. 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






15. Power Systems Branch [Position] one required nuclear utilities to install degraded grid voltage relay schemes to preclude connecting safety related loads to the grid following an accident if grid voltage should be inadequate to support required opera






16. Used to convert mechanical energy to electrical energy coupled to the turbine shaft






17. One or more cells connected in series






18. Used at low voltage levels (600 volts and below) to feed individual loads. These devices typically contain a thermal magnetic element which provides an inverse time tripping characteristic.






19. Are used at low voltages rather than medium voltage and they contain CTs and protective devices as part of the assembly.






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






21. Any path that electrons flow through






22. Analogous to a power plant switchyard but on the load end. Voltage is stepped down to Distribution System voltages.






23. 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.






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






25. Voltage Source - Conductor - Switch - Load






26. 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






27. Neutral charged particles of an atom






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






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






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






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






32. High voltage breakers and buses are arranged to allow power flow on the grid while isolating individual generators - transformers or transmission lines as needed. Power from the plant is delivered to the grid via the plant ****** - and the ******* se






33. 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.






34. Used to optimize power output. Multiply by root 3.






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

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36. A device that changes mechanical energy into electricity






37. A material in which charge moves through easily






38. 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






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






40. 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






41. 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.






42. Positively charged particles of an atom






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






44. The product of voltage times current






45. Significant impact on the capability of equipment to perform properly since the torque delivered by a motor is proportional to the voltage squared






46. 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.






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






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






49. Are used to supply power to smaller industrial and commercial users as well as residential customers. These lines can be compared to local roads such as the one in your local area or neighborhood - i.e. they're designed to handle the needs of local t






50. 125 and 250 VDC.







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