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 interaction of magnetism and electrical current.






2. Variable Frequency.






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






4. Radio Frequency Interference.






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






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






7. 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.






8. The rate at which electricity flows - measured in amperes - 1 ampere = 1 coulomb per second.






9. kV; One thousand volts.






10. A device used to store electrical energy in an electrostatic field until discharge.






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






12. An electromagnetic radiation produced when the inner satellite electrons of heavy atoms have been excited by collision with a stream of fast electrons return to their ground state - giving up the energy previously imparted to them.






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






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






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






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






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






18. 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(-).






19. Symbol used to denote transformer.






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






21. A material used to conduct electricity or heat.






22. A process that is kept at a constant temperature.






23. A high-intensity incandescent lamp with a quartz bulb containing an inert gas of iodine or bromine vapor.






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






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






26. A form of silicone dioxide. Commonly used in the making of radio transmitters and heat resistant products.






27. The measure of the ability of a material or substance to carry electrical current.






28. Symbol for Mega - one million.






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






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






31. MLS; A photoelectric control that operates on pulsed infrared radiation at a specific frequency - and responds only to that frequency of pulse. MLS is used frequently in areas where ambient light may cause problems with other types of sensors.






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






33. 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.






34. The average temperature of a process.






35. MA; One thousandth of an amp.






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






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






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






39. A unit of energy in solid-state physics with mass and momentum but that does not exist as a free particle.






40. 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






41. ISO;






42. One millionth of an amp.






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






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






45. Kva; One thousand volt amps.






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






47. A tube - pipe or trough that carries and protects electric wiring.






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






49. The delayed period of time when outputs are turned off when power is initially applied.






50. 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.'