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






2. 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.






3. The standard unit of magnetic flux.






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






5. The average temperature of a process.






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






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






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






9. OSHA;






10. A device having two terminals and has a low resistance to electrical current in one direction and a high resistance in the other direction.






11. 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.






12. A variable resistor.






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






14. The element inside a vacuum tube - incandescent lamp or other similar device.






15. One millionth of a volt.






16. 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.






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






18. Variable Frequency.






19. The mechanism of a switch which operates the contacts.






20. Kw; One thousand watts.






21. 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.






22. A material used to conduct electricity or heat.






23. Electric and magnetic force field that surrounds a moving electric charge.






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






25. That part of a circuit which is physically interconnected.






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






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






28. FM; ~LINK~






29. A solid-state switching device for semiconductors to convert AC current in one of two directions controlled by an electrode.






30. The speed or time rate of change of displacement.






31. A rise and fall of voltage - current - or other faction that would be constant under normal conditions. A pulse that is intentionally induced will have a finite duration time.






32. The opposition to electrical flow.






33. Radio Frequency Interference.






34. (DC); Electrical current that flows consistently in one direction only.






35. UL; ~LINK~






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






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






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






39. 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.






40. A device used to store electrical energy in an electrostatic field until discharge.






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






42. Normally Closed.






43. A circuit which may have one or many resistors and/or other various devices connected in a series so that the current has only one path to follow.






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






45. The magnitude and time phase of a quantity - represented by a plotted line.






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






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






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






49. An electrical circuit that is not 'made'. Contacts - switches or similar devices are open and preventing the floe of current.






50. A Solid State relay is a switching device that completes or interrupts a circuit electrically and has no moving parts. A Mechanical relay is an electromechanical device that closes contacts to complete a circuit or opens contacts to interrupt a circu