Test your basic knowledge |

Electrical Components

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. IBEW;






2. To close an electrical circuit. To establish an electrical circuit through the closing of a contact - switch or other related device.






3. When there is current through a semiconductor p-n junction it is the resistance of a forward-biased junction.






4. A device - instrument or component that will not produce any spark or thermal effects under any conditions that are normal or abnormal that will ignite a specified gas mixture. Electrical and thermal energy limits are at levels incapable of causing i






5. The time based relationship between a reference and a periodic function.






6. ANSI;






7. The amount of power that is consumed and converted to heat.






8. A silicone semiconductor that maintains a fixed voltage in a circuit.






9. A three terminal semiconductor device. In a 'FET' the current is from source to drain because a conducting channel is formed by a voltage field between the gate and the source.






10. Pounds per square inch absolute. Pressure commonly in reference to vacuum.






11. A coil of wire wound about a magnetic material - such as iron - that produces a magnetic field when current flows through the wire.






12. Applying molecular physics to electronics.






13. Two dissimilar metals connected at a point - that produce an electrical current whose magnitude is dependent upon the temperature at the junction point.






14. Magnetically - opposite poles - north and south. In electricity - oppositely charged poles - positive and negative.






15. The unit by which electrical resistance is measured. One ohm is equal to the current of one ampere which will flow when a voltage of one volt is applied






16. The rapid on/off cycling of a relay caused by improper signal or adjustment - faulty contacts - or other malfunction.






17. Pressure that is less than atmospheric pressure.






18. A panel meter with zero and span adjustments - commonly scaled for signals such as 1-5 volts - 4-20mA - etc.






19. In a three phase connection all three phases are connected in series thus forming a closed circuit.






20. MA; One thousandth of an amp.






21. A high-intensity incandescent lamp with a quartz bulb containing an inert gas of iodine or bromine vapor.






22. A switching device used in switching high DC loads. It contains a small permanent magnet which deflects arc in order to quench it.






23. A full path of electrical current from a voltage source that passes completely from one terminal of the voltage source to another.






24. A device that transfers power or energy from one system to another - such as taking a physical quality and changing it to an electrical signal.






25. A connected path to earth or to a conductive body that has a reference potential to earth.






26. NFPA;






27. A unit of electric charge. The amount of charge conveyed in one second by one ampere.






28. See; 'Proximity Sensor'.






29. The unit for capacitance. A capacitor that stored one coulomb of charge with one volt across it will have a value of one farad.






30. European environmental ratings. Similar to NEMA ratings in the USA. IP;*site has NEMA comparisons ~LINK~






31. An arrangement of any of various conductors through which electric current can flow from a supply current.






32. The range of voltage needed to maintain operation of a control or device.






33. Protective circuitry to guard against spikes that might be induced on the supply line.






34. The form of radiation used to make non-contact temperature measurements. In the electromagnetic spectrum it is the area beyond red light from 760 nanometers to 1000 microns.






35. One of the very small discrete packets into which many forms of energy are subdivided.






36. Radio Frequency Interference.






37. A process that is kept at a constant temperature.






38. UL; ~LINK~






39. Kva; One thousand volt amps.






40. A solid-state switching device used in switching AC wave forms.






41. NEMA;






42. A reference point at zero potential with respect to the earth. In an electronic circuit it is the common return path for electric current. A conducting connection between the earth and an electrical circuit or electrical equipment. Also - the negativ






43. RMS; AC voltage that equals DC voltage that will do the same amount of work. For an AC sine wave it is 0.707 x peak voltage.






44. A controller whose action is either fully on or off.






45. Intensity. The commonly used symbol used to represent Amperes when used in formulas. I = Intensity = Current = Amps = Amperes.






46. Very High Frequency.






47. The amount of energy released in a nuclear reaction. It is expressed in atomic mass units - or in million electron volts (MEV).






48. One millionth of an amp.






49. The conductor that is used by intent to connect the grounded circuit of an electrical wiring system or equipment to a grounding electrode with reference to earth.






50. 'American Wire Gauge' system used to determine wire size.