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. One millionth of a meter.






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






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






4. 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.






5. Expressed in webers - it is the product of the average normal component of the magnetic intensity over a surface and the area of that surface.






6. A variable resistor.






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






8. A unit of electrical current named after French physicist Andr






9. 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






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






11. -459.67






12. 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






13. 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.






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






15. The average temperature of a process.






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






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






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






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






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






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






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






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






24. A circuit element or components that allows signals of certain frequencies to pass and blocks signals of other frequencies.






25. See; 'Maximum Power Rating'.






26. Applying molecular physics to electronics.






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






28. See; 'Proximity Sensor'.






29. 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






30. Symbol for Mega - one million.






31. Electric current passing through an electrolyte which produces chemical changes in it.






32. 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.






33. Resistance Temperature Detector.






34. A device - instrument or component that will not produce any spark or thermal effects under any conditions that are normal or abnormal that will ignite a specified gas mixture. Electrical and thermal energy limits are at levels incapable of causing i






35. Kw; One thousand watts.






36. MV; One thousandth of a volt. The difference in potential needed to cause a current of one milliampere flow through a resistance of one ohm.






37. Intensity. The commonly used symbol used to represent Amperes when used in formulas. I = Intensity = Current = Amps = Amperes.






38. A unit of electric charge. The amount of charge conveyed in one second by one ampere.






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






40. A device having two terminals and has a low resistance to electrical current in one direction and a high resistance in the other direction.






41. IEC;






42. 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.






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






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






45. NEMA;






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






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






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






49. IBEW;






50. 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.