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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. Response to the change in the level of the input signal.






2. NEMA;






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






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






5. 'American Wire Gauge' system used to determine wire size.






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






7. Mm; One thousandth of a meter.






8. Radio Frequency Interference.






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






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






12. Resistance Temperature Detector.






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






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






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






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






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






18. In a three phase connection all three phases are connected in series thus forming a closed circuit.






19. Ultra High Frequency






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






21. A hypothetical nuclear of a quark plus an antiproton.






22. '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.






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






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






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






26. The amount of time it takes for a device to react to an input signal.






27. 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.






28. Symbol used for wye configuration for three phase electrical connections.






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






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






31. A fundamental negatively (-) charged atomic particle that rotates around a positively (+) charged nucleus of the atom.






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






33. 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






34. A unit of energy in solid-state physics with mass and momentum but that does not exist as a free particle.






35. A panel meter with zero and span adjustments - commonly scaled for signals such as 1-5 volts - 4-20mA - etc.






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






37. The opposition to electrical flow.






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






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






40. A three mode control consisting of time Proportioning - Integral and Derivative rate action.






41. The time it takes for a controller to complete one on/off cycle.






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






43. A small current leaking from an output device in the off state caused by semiconductor characteristics.






44. 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.






45. 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.






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






47. Pressure that is less than atmospheric pressure.






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






49. Very High Frequency.






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