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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. The flow of electrons (-) through a material






2. 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.






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






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






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






6. 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.






7. 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.






8. 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 ****






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






10. Temperature Controlled






11. Positively charged particles of an atom






12. The flow of electrons






13. An electrode where free electrons are produced






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






15. 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






16. 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.






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






18. 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






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






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






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






22. V=IR.

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23. 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






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






25. A circuit with a break in its path






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






27. 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.






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






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






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






31. Atoms that have acquired an electrical charge






32. Neutral charged particles of an atom






33. 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






34. 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






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






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. 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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38. 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






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






40. 125 and 250 VDC.






41. 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.






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






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. Any path that electrons flow through






45. A device that changes mechanical energy into electricity






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






47. Voltage Source - Conductor - Switch - Load






48. 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 -






49. The product of voltage times current






50. 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.