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. ISO;






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






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






4. Symbol used to denote transformer.






5. Symbol for Mega - one million.






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






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






8. Normally Closed.






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






10. -459.67






11. An anode (+) or cathode (-) conductor on a device through which an electric current passes.






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






13. The quality of having the ability to emit light when struck by electrons or another form of radiation.






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






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






16. Commonly used in generators and motors - it is an electromagnet formed from a coil of insulated wire that is wound around a soft iron core.






17. 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.






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






19. ANSI;






20. A region of space that surrounds a moving electrical charge or a magnetic pole - in which the electrical charge or magnetic pole experiences a force that is above the electrostatic ones associated with particles at rest.






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






22. 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.






23. A variable resistor.






24. 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.






25. Variable Frequency.






26. The measure of the ability of a material or substance to carry electrical current.






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






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






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






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






31. Kwh; One thousand watt-hours.






32. An interconnected arrangement of parts for carrying high-voltage electricity.






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






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






35. A negative (-) electrode. The point of entry of electrons into a device from an external circuit. The negative electrode of a semiconductor diode.






36. Kw; One thousand watts.






37. 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.






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






39. 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






40. UL; ~LINK~






41. IBEW;






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






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






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






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






46. 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.






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






48. 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.






49. The standard unit of magnetic flux.






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