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Engineering Studies

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. Between 2000-35 -700km above the earth's surface.






2. Degradation of a signal as it travels over a cable. Attenuation increased with higher frequencies






3. Horizontal






4. Hard - brittle






5. Soaked cast iron at 870c for long time then cooled slow






6. 100khz






7. A flexible communications cable that contains pairs of insulated copper wires that are twisted together for reduction of EMI and RFI and covered with an outer insulating jacket.






8. An orbit in which a satellite orbits Earth at the same rate as Earth rotates and thus stays over the same place all the time






9. A method of transmitting signals by changing the amplitude of a waves






10. 100GHZ+






11. Ma/vr x 100/1






12. Load/area






13. Used where scarifical anodes cannot supply enough protection - offshore oil rigs - buried pipes - big things. protection is provided by connecting a rectifier to provide a direct current source between the anode and the metal being protected.






14. A device that converts the AC inside a DC generator to a DC output or converts a DC supply to an AC inside a DC motor.keeping the armature rotating






15. Majority silicon X>1.5% for graphite. Graphite in flakes that cause stress points






16. Being forced - under pressure - through a hole like toothpaste. either hot or cold






17. Results from the changing anode and cathode regions over the entire surface






18. Good high temp wear - tools






19. 10MHZ






20. The greater the sulphur the harder the rubber to stretch






21. Mass X gravity X height






22. Makes brittle by heating and then cooling quickly - less flexible. Red Heat then quenching






23. 1%<X<2% carbon. more cementite - used for files






24. The quantity of information that can be transmitted through a communication medium in a given amount of time.






25. Usually used together - strengthening and toughness






26. 0.3%<X<0.6% carbon. mostly pear- lite - heat treatable. 0.4 used in axles






27. Soft - ductile






28. High pressure

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29. Small amounts of magnesium to make spheres instead of flakes. thus no stress concentrations






30. Low pressure

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31. 1/4 of the wavelength (higher better)






32. Steel reinforcing rusts - rust has a greater volume concrete then breaks of as a result.






33. Can be reflected of the ionosphere - 3 to 30 megahertz






34. Resulting from exposure to oxygen in the atmosphere - chemical fumes - steam - flue gas. creates a layer of metal oxide.






35. Ma/vr






36. A method of transmitting signals by changing the frequency of a wave






37. Rubbers






38. Glass that is strengthened by introducing stress through rapid heating and cooling of the glass surfaces






39. Use of xrays passed through the material to make a visual record of internal structures on specially sensitized film






40. Difference/original






41. Solid at room temp - weak secondary bonds. can be reheated multiply times.






42. Resulting from combined effect of stresses set up within the metal






43. Maximum bending moments X distance to natural axis/ second moment of area






44. A solid state component made from three layers of semiconductor material that can amplify the strenght of an electric signal or act as an electronic switch






45. A motor that is light - rugged and very reliable - runs on ac current and are more common in robotics. Can only run at a certain speed






46. Can only be softened once - bonded strongly - generally stronger that thermoplastics. stronger secondary bonds






47. Dye is sprayed onto a surface - with excess being wiped away - meaning any left on the piece would be in cracks that exist in it. A Fluorescent light is turned on to expose any left over - I.e in the cracks






48. Field winding parallel to armature winding. Bad for direct coupling






49. 1/2Xmass X velocity X velocity






50. Softening a material such as metal by controlled heating and cooling. This makes the metal less brittle and more easily adaptable. Soaking till austenite then cooling slowly. large grains