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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. 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






2. One or more cells connected in series






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






4. A circuit with a break in its path






5. 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.






6. 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.






7. An electrode where free electrons are produced






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






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






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






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






12. 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.






13. Neutral charged particles of an atom






14. 125 and 250 VDC.






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






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






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






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






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






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

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21. V=IR.

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






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






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






25. 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






26. 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






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






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






29. 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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30. 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.






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






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






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






35. A device that changes mechanical energy into electricity






36. 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.






37. 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






38. The product of voltage times current






39. May be used to power various low voltage loads and are typically used for applications that do not require any form of remote control.






40. 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.






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






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






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






44. 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






45. A condition where one or more phases have come into contact with ground or other phase(s) of the circuit - or the insulation separating them has been degraded. The current flow is only limited by the impedance between the source(s) and the ****






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






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






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






49. 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 -






50. Used to supply power to large industrial and commercial facilities as well as the Retail System. lines can be compared to state highways and major roads around cities.