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






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






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






4. Neutral charged particles of an atom






5. 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






6. 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






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






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. An electrode where reduction occurs






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






11. 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.






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






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






14. 125 and 250 VDC.






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






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






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






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






19. 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.






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






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






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






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






24. 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






25. Voltage Source - Conductor - Switch - Load






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






27. Negatively charged particles of an atom






28. 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






29. The flow of electrons






30. 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.






31. 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.






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






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






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






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






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






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. 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






40. 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






41. An electrode where free electrons are produced






42. 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 -






43. 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






44. A device that changes mechanical energy into electricity






45. A material in which charge moves through easily






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






47. V=IR.

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






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






50. The product of voltage times current