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. Volt-ohm Meter.






2. 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.






3. MA; One thousandth of an amp.






4. Non-conducting material used to isolate and/or insulate energized electrical components.






5. Variable Frequency.






6. Kva; One thousand volt amps.






7. The difference in potential measured between two points caused by resistance or impedance.






8. OSHA;






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






10. Chemical changes and energy produced by electric currents.






11. 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.






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






13. The behavior of charged particles and the steady motion of charge in magnetic and electric fields.






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






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






16. The standard unit of magnetic flux.






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






18. 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.






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






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






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






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






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






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






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






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






28. Normally Closed.






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






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






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






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






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






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






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






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






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






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






39. A variable resistor.






40. 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






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






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






43. A meter used to measure units of volts.






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






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






46. 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.






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






48. 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.






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






50. A full path of electrical current from a voltage source that passes completely from one terminal of the voltage source to another.