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






2. IEEE;






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






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






5. The unit by which electrical resistance is measured. One ohm is equal to the current of one ampere which will flow when a voltage of one volt is applied






6. 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.






7. 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.






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






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






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






11. 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.






12. Resistance Temperature Detector.






13. Silicone Controlled Rectifier.






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






15. 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.






16. IEC;






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






18. One millionth of an amp.






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






20. The opposition to electrical flow.






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






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






23. A highly accurate bridge configuration that is used to measure three-wire RTD thermometers.






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






25. Normally Open.






26. The time delay between the output signal and the response time of the receiver of the signal.






27. ISA;






28. The rate at which electricity flows - measured in amperes - 1 ampere = 1 coulomb per second.






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






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






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






32. 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.






33. A meter used to measure units of volts.






34. 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.






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






36. 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.






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






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






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






40. '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.






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






42. MA; One thousandth of an amp.






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






44. See; 'Proximity Sensor'.






45. A variable resistor.






46. NFPA;






47. Pressure that is less than atmospheric pressure.






48. Mm; One thousandth of a meter.






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






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