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. NFPA;






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






3. A circuit element or components that allows signals of certain frequencies to pass and blocks signals of other frequencies.






4. Normally Open.






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






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






7. The method by which two devices or systems are connected and interact with each other.






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






9. The conductor that is used by intent to connect the grounded circuit of an electrical wiring system or equipment to a grounding electrode with reference to earth.






10. CSA ~LINK~






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






12. NEMA;






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






14. One thousandth of an inch.






15. Magnetically - opposite poles - north and south. In electricity - oppositely charged poles - positive and negative.






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






17. (AC); Electrical current that changes (or alternates) in magnitude and direction of the current at regular intervals.






18. See; 'Proximity Sensor'.






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






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






22. Resistance Temperature Detector.






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






24. The maximum temperature at which a device can be safely operated.






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






26. Volt-ohm Meter.






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






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






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






30. A unit of electrical current named after French physicist Andr






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






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






33. One millionth of a meter.






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






35. The amount of power that is consumed and converted to heat.






36. A meter used to measure electrical resistance in units of ohms.






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






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






39. UL; ~LINK~






40. Pounds per square inch absolute. Pressure commonly in reference to vacuum.






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






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






43. Pounds per square inch gage. Pressure in relationship to the ambient air pressure>






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






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






46. Pressure that is less than atmospheric pressure.






47. (ampere)The basic unit of current in an electrical circuit. One ampere is the rate of flow of electric current when one coulomb of charge flows past a point in the circuit in one second. Symbolically characterized by the letter 'I' and sometimes 'A'






48. Kw; One thousand watts.






49. 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.






50. An ionized gas containing about equal numbers of positive and negative charges - which is a good conductor of electricity - and is affected by a magnetic field.