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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. The standard unit of magnetic flux.






2. The part of a circuit that supplies power to the entire circuit or part of the circuit. Usually a separate unit that supplies power to a specific part of the circuit in a system.






3. The amount of heat needed to convert one pound of water to one pound of steam. Latent heat is expressed in BTU per pound.






4. A variable resistor.






5. 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.






6. The increase of the power level - current or voltage of a signal. In an amplifier it is the ratio of the output to the input signal levels.






7. Symbol used to denote transformer.






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






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






10. EPA; ~LINK~






11. The output that is produced when one or more inputs are present.






12. UL; ~LINK~






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






14. The act of the opening of an electrical circuit.






15. Very High Frequency.






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






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






18. FM; ~LINK~






19. A form of control where the power supplied to a process is controlled by limiting the phase angle of the line voltage.






20. SI; The standard metric system of units.






21. A device that converts AC voltage to pulsating DC voltage.






22. The opposition to electrical flow.






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






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






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






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






27. Electric current passing through an electrolyte which produces chemical changes in it.






28. NEMA;






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






30. The rate of transfer of energy.






31. MA; One thousandth of an amp.






32. Silicone Controlled Rectifier.






33. Applying molecular physics to electronics.






34. The electrical demand of a process. Load can be expressed or calculated as amps (current) - ohms (resistance) or watts (power).






35. 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






36. Also known as Hertz - it is the number of complete cycles of periodic waveform that occur during a time period of one second.






37. An electrically conductive fused salt or a solution where the charge is carried by ionic movement.






38. The standard that is used to make comparison measurements or calibrations.






39. Electrical energy produced by the action of heat.






40. Current Consumption. The amount of amps or milliamps needed to maintain operation of a control or device.






41. Normally Open.






42. ISA;






43. 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.






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






45. 'British Thermal Unit' - the amount of thermal energy required to raise one pound of water 1degree F. One BTU is equal to .293 watt hours. One kWh is equal to 3412 BTUs.






46. NFPA;






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






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






49. A tube - pipe or trough that carries and protects electric wiring.






50. A sudden and unwanted increase or decrease of supply voltage or current.







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