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. 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.'






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






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






4. Symbol used to denote transmitter.






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






6. (DC); Electrical current that flows consistently in one direction only.






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






8. 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.






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






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






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






12. 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.






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






14. A meter used to measure electrical resistance in units of ohms.






15. Silicone Controlled Rectifier.






16. ISO;






17. A controller whose action is either fully on or off.






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






19. 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






20. Volt-ohm Meter.






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






22. 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.






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






24. That part of a circuit which is physically interconnected.






25. The standard that is used to make comparison measurements or calibrations.






26. NEMA;






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






28. 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.






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






30. Variable Frequency.






31. Resistance Temperature Detector.






32. 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






33. 'British Thermal Unit' - the amount of thermal energy required to raise one pound of water 1degree F. One BTU is equal to .293 watt hours. One kWh is equal to 3412 BTUs.






34. (AC); Electrical current that changes (or alternates) in magnitude and direction of the current at regular intervals.






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






36. The current that is gained by a transistor when it is connected in a common emitter circuit.






37. Ultra High Frequency






38. NFPA;






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






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






41. A variable resistor.






42. ANSI;






43. The method by which two devices or systems are connected and interact with each other.






44. Kwh; One thousand watt-hours.






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






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






47. Electrical energy produced by the action of heat.






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






49. Inspection - analysis and action required to ensure quality of output.






50. A hypothetical nuclear of a quark plus an antiproton.