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






2. NEMA;






3. Radio Frequency Interference.






4. The increase of the power level - current or voltage of a signal. In an amplifier it is the ratio of the output to the input signal levels.






5. Ultra High Frequency






6. The average temperature of a process.






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






8. 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.






9. The opposition to electrical flow.






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






11. Kva; One thousand volt amps.






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






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






14. 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.






15. The delayed period of time when outputs are turned off when power is initially applied.






16. See; 'Maximum Power Rating'.






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






18. The maximum watts that a device can safely handle.






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






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






21. Current Consumption. The amount of amps or milliamps needed to maintain operation of a control or device.






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






23. The standard unit of magnetic flux.






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






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






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






27. A variable resistor.






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






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






30. The unit for capacitance. A capacitor that stored one coulomb of charge with one volt across it will have a value of one farad.






31. Very High Frequency.






32. The form of radiation used to make non-contact temperature measurements. In the electromagnetic spectrum it is the area beyond red light from 760 nanometers to 1000 microns.






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






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






35. The measured amount of electrical energy that represents the electrostatic forces between atomic particles. The nucleus of an atom has a positive charge (+) and the electrons have a negative charge(-).






36. 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.






37. '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.






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






39. Resistance Temperature Detector.






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






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






42. Variable Frequency.






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






44. Kwh; One thousand watt-hours.






45. An area in which combustible or flammable mixtures are or could be present.






46. IEEE;






47. 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.






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






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






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.