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






2. Very High Frequency.






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






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






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






6. 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.






7. One millionth of an amp.






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






9. One thousandth of an inch.






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






11. 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.






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






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






14. Chemical changes and energy produced by electric currents.






15. SI; The standard metric system of units.






16. The voltage that is applied across a semiconductor junction to permit forward current through that junction and the device. Forward voltage is also known as 'bias.'






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






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






19. Output power divided by input power - (work performed in ratio to energy used to produce it).






20. 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.






21. kV; One thousand volts.






22. An ionized gas containing about equal numbers of positive and negative charges - which is a good conductor of electricity - and is affected by a magnetic field.






23. 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.






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






25. 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






26. 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.






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






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






29. Symbol used to denote transmitter.






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






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






32. 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






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






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






35. 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






36. CSA ~LINK~






37. A Solid State relay is a switching device that completes or interrupts a circuit electrically and has no moving parts. A Mechanical relay is an electromechanical device that closes contacts to complete a circuit or opens contacts to interrupt a circu






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






39. OSHA;






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






41. 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.






42. 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.






43. Resistance Temperature Detector.






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






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






46. Electrical energy produced by the action of heat.






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






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






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






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