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. ANSI;






2. A highly accurate bridge configuration that is used to measure three-wire RTD thermometers.






3. NEMA;






4. MLS; A photoelectric control that operates on pulsed infrared radiation at a specific frequency - and responds only to that frequency of pulse. MLS is used frequently in areas where ambient light may cause problems with other types of sensors.






5. Symbol used to denote transmitter.






6. A sensor or switch with the ability to detect it's relationship to a metal target without making physical contact.






7. A form of silicone dioxide. Commonly used in the making of radio transmitters and heat resistant products.






8. OSHA;






9. The power of one watt operating for one hour - and equal to 3 -600 joules.






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






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






12. The opposition to electrical flow.






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






14. Output power divided by input power - (work performed in ratio to energy used to produce it).






15. In a temperature controller it is the output form that provides a current proportional to the amount of control that is required. Commonly it is the 4 to 20 milliamp current proportioning band that is used in the electronics industry.






16. Radio Frequency Interference.






17. UL; ~LINK~






18. Kva; One thousand volt amps.






19. A full-wave rectifier where the diodes are connected in a bridge circuit. This allows the current to the load during both the positive and negative alternating of the supply voltage.






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






21. The unit of power. One watt equals one joule per second - 1/746th horsepower.






22. Non-conducting material used to isolate and/or insulate energized electrical components.






23. The maximum watts that a device can safely handle.






24. A form of energy produced by the flow of particles of matter and consists of commonly attractive positively (protons [+]) and negatively (electrons [-]) charged atomic particles. A stream of electrons - or an electric current.






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






26. A fluctuation in the intensity of a steady current.






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






28. The resistance to electrical current. Resistance is measured in ohms.






29. IEC;






30. MV; One thousandth of a volt. The difference in potential needed to cause a current of one milliampere flow through a resistance of one ohm.






31. The pronounced curvature in reverse voltage current that is characteristic of a diode.






32. Very High Frequency.






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






34. A small current leaking from an output device in the off state caused by semiconductor characteristics.






35. Or Hertz; The measurement of the time period of one alternating electric current. In the United States this is commonly 60 cycles per second - or 60 Hertz.






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






37. The modification of a signal that causes the output to remain energized until it is released by intent.






38. LED; A solid state light source component that emits light or invisible infrared radiation.






39. A positive (+) electrode. The point where electrons exit from a device to the external electric circuit.






40. A switch in a controller that manually resets after exceeding the controllers limit.






41. NEC: A set of regulations pertaining to electrical installation and design in the interest of the protection of life and property. The NEC is adopted by NFPA and approved by ANSI. It is the preferred standard of guidelines used by most electrical reg






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






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






44. Voltage; The unit of electromotive force (EMF) that causes current to flow. One volt causes a current of one amp through a resistance of one ohm.






45. The range of temperature over which a device may be safely used. The temperature range which the device has been designed to operate.






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






47. The adjustment of a display that results are zero on the display corresponding to a non-zero signal.






48. A hypothetical nuclear of a quark plus an antiproton.






49. Mm; One thousandth of a meter.






50. Normally Closed.