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






2. 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.






3. An electrode where reduction occurs






4. 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






5. 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.






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


7. 125 and 250 VDC.






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






9. A material in which charge moves through easily






10. 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.






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






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






13. 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






14. 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






15. Temperature Controlled






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






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






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






19. 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






20. 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 -






21. A circuit with a break in its path






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






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






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






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






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






27. 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






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






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






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






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






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






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






34. The source voltage is equal to the sum of the voltage drops across the elements of the circuit and the load.


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






36. The product of voltage times current






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






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






39. Any path that electrons flow through






40. 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






41. The flow of electrons






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






43. Positively charged particles of an atom






44. 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.






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






46. 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 ****






47. V=IR.


48. Atoms that have acquired an electrical charge






49. 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.






50. An electrode where free electrons are produced