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. Chemical changes and energy produced by electric currents.






2. A three terminal semiconductor device. In a 'FET' the current is from source to drain because a conducting channel is formed by a voltage field between the gate and the source.






3. '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.






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






5. MA; One thousandth of an amp.






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






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






9. Silicone Controlled Rectifier.






10. Symbol used to denote transmitter.






11. 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.






12. A coil of wire wound about a magnetic material - such as iron - that produces a magnetic field when current flows through the wire.






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






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






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






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






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






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






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






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






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






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






23. An arrangement of any of various conductors through which electric current can flow from a supply current.






24. Two dissimilar metals connected at a point - that produce an electrical current whose magnitude is dependent upon the temperature at the junction point.






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






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






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






28. IEEE;






29. The current that is gained by a transistor when it is connected in a common emitter circuit.






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






31. FM; ~LINK~






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






33. A reference point at zero potential with respect to the earth. In an electronic circuit it is the common return path for electric current. A conducting connection between the earth and an electrical circuit or electrical equipment. Also - the negativ






34. kV; One thousand volts.






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






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






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






38. 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.






39. A meter used to measure units of volts.






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






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






42. 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






43. Electrical energy produced by the action of heat.






44. Radio Frequency Interference.






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






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






47. 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.






48. One thousandth of an inch.






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






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