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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. 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






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






3. 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






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






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






7. Is the vector sum of real and reactive power in an AC circuit and is measured in volt-amperes.






8. 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






9. 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.






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






11. The product of voltage times current






12. A solid conductor through which a current enters or exits a medium






13. 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






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






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






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






17. 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






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






19. Voltage Source - Conductor - Switch - Load






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






21. The flow of electrons






22. 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.






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






24. A device that changes mechanical energy into electricity






25. 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.






26. Temperature Controlled






27. If you are requesting service for new loads - or are making changes that affect the time when a load would operate or the amount of load -






28. 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.






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






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






31. 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






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






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






34. 125 and 250 VDC.






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






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






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






38. 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.






39. Neutral charged particles of an atom






40. Used for transmission systems which are used for transporting bulk power from large generators to areas with heavy load concentrations such as cities.






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






42. A material in which charge moves through easily






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






44. 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.






45. Any path that electrons flow through






46. Are used to provide low current circuits for use in metering - monitoring - and protective relaying applications. The turns ratio determines the amount of current that will be available in the secondary as a function of the system current on the prim






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






48. Is typically used for medium voltage applications where the 3 phase conductors can be mounted within the same enclosure.






49. Atoms that have acquired an electrical charge






50. A fundamental quantity in electricity (+ or -)







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