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






2. Silicone Controlled Rectifier.






3. See; 'Proximity Sensor'.






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






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






6. OSHA;






7. The amount of energy released in a nuclear reaction. It is expressed in atomic mass units - or in million electron volts (MEV).






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






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






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






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






12. One thousandth of an inch.






13. UL; ~LINK~






14. 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.






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






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






17. One millionth of an amp.






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






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






20. In a temperature controller it is the output form that provides a current proportional to the amount of control that is required. Commonly it is the 4 to 20 milliamp current proportioning band that is used in the electronics industry.






21. One millionth of a meter.






22. 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.






23. The rate of transfer of energy.






24. Current Consumption. The amount of amps or milliamps needed to maintain operation of a control or device.






25. 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.






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






27. The part of a circuit that supplies power to the entire circuit or part of the circuit. Usually a separate unit that supplies power to a specific part of the circuit in a system.






28. 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.






29. Kwh; One thousand watt-hours.






30. The time delay between the output signal and the response time of the receiver of the signal.






31. Pounds per square inch differential. The difference in pressure between two points.






32. A sudden and unwanted increase or decrease of supply voltage or current.






33. See; 'Maximum Power Rating'.






34. 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.






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






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






37. The range of temperature over which a device may be safely used. The temperature range which the device has been designed to operate.






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






39. Kva; One thousand volt amps.






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






41. 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.






42. The amount of heat needed to convert one pound of water to one pound of steam. Latent heat is expressed in BTU per pound.






43. Ultra High Frequency






44. 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.






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






46. Or Hertz; The measurement of the time period of one alternating electric current. In the United States this is commonly 60 cycles per second - or 60 Hertz.






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






48. Applying molecular physics to electronics.






49. The unit of power. One watt equals one joule per second - 1/746th horsepower.






50. An interconnected arrangement of parts for carrying high-voltage electricity.