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. A unit of electrical current named after French physicist Andr






2. A temperature scale. Also known as centigrade. Sea level water will freeze at 0






3. The moving of electricity or heat through a conductor.






4. An electrical resistor composed of semiconductor material - whose resistance is a known rapidly varying function of temperature.






5. The time delay between the output signal and the response time of the receiver of the signal.






6. Variable Frequency.






7. Symbol used to denote transformer.






8. 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.






9. The basic of thermal energy. The work done by the force of one newton acting through a distance of one meter.






10. The opposition to electrical flow.






11. IBEW;






12. 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.






13. A variable resistor.






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






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






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






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






18. One millionth of an amp.






19. 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






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






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






22. ISA;






23. Pounds per square inch differential. The difference in pressure between two points.






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






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






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






27. ANSI;






28. Normally Open.






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






30. Inspection - analysis and action required to ensure quality of output.






31. A hypothetical basic subatomic nuclear particle believed to be the basic component of protons - neutrons - etc.






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






33. 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.






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






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






36. 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






37. The energy delivered by a circuit or device. The electrical signal produced by the input to the transducer.






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






39. Expressed in webers - it is the product of the average normal component of the magnetic intensity over a surface and the area of that surface.






40. See; 'Proximity Sensor'.






41. IEEE;






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






43. 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.






44. A switch with contacts that are made with actuating force and released when that force is removed.






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






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






47. Kwh; One thousand watt-hours.






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






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






50. The difference in potential measured between two points caused by resistance or impedance.