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. 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(-).






2. Silicone Controlled Rectifier.






3. A device incorporating semiconductor material and suitable contacts capable of performing electrical functions (such as voltage - current or power amplification) with low power requirements.






4. An electrical resistor composed of semiconductor material - whose resistance is a known rapidly varying function of temperature.






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






6. The resistance to electrical current. Resistance is measured in ohms.






7. Resistance Temperature Detector.






8. FM; ~LINK~






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






10. The modification of a signal that causes the output to remain energized until it is released by intent.






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






12. The standard that is used to make comparison measurements or calibrations.






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






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






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






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






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






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






19. Kva; One thousand volt amps.






20. The speed or time rate of change of displacement.






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






22. An electromagnetic radiation produced when the inner satellite electrons of heavy atoms have been excited by collision with a stream of fast electrons return to their ground state - giving up the energy previously imparted to them.






23. EPA; ~LINK~






24. NFPA;






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






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






27. One millionth of a volt.






28. An electrical circuit that increases the power - voltage or current of an applied signal.






29. 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.






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






31. A circuit conductor that is grounded to become part of the electric circuit by design and intent.






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






33. The pronounced curvature in reverse voltage current that is characteristic of a diode.






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






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






37. A high-intensity incandescent lamp with a quartz bulb containing an inert gas of iodine or bromine vapor.






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






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






40. 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.






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






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






43. 'Common Mode Voltage.' The voltage which is tolerable between signal and ground.






44. A fluctuation in the intensity of a steady current.






45. SI; The standard metric system of units.






46. 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.






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






48. Normally Closed.






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






50. '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.