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






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






3. 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.






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






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






6. A form of energy produced by the flow of particles of matter and consists of commonly attractive positively (protons [+]) and negatively (electrons [-]) charged atomic particles. A stream of electrons - or an electric current.






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






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






9. The rate of transfer of energy.






10. Pressure that is less than atmospheric pressure.






11. MA; One thousandth of an amp.






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






13. Symbol used for wye configuration for three phase electrical connections.






14. The quality of having the ability to emit light when struck by electrons or another form of radiation.






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






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






17. See; 'Maximum Power Rating'.






18. A solid-state switching device for semiconductors to convert AC current in one of two directions controlled by an electrode.






19. 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(-).






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






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






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






23. 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.






24. A variable resistor.






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






26. An electrical circuit that is not 'made'. Contacts - switches or similar devices are open and preventing the floe of current.






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






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






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






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






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






32. Electrical energy produced by the action of heat.






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






34. Kwh; One thousand watt-hours.






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






36. Normally Open.






37. The opposition to electrical flow.






38. A panel meter with zero and span adjustments - commonly scaled for signals such as 1-5 volts - 4-20mA - etc.






39. 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.






40. ANSI;






41. The moving of electricity or heat through a conductor.






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






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






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






45. 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.






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






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






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






49. SI; The standard metric system of units.






50. 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.