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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. 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






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






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






4. Elongation of grain flow in direction of rolling






5. Good high temp wear - tools






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






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






8. 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






9. Based on the principle that magnetic materials will have distorted magnetic fields in the vicinity of material defects






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






11. 1GHZ






12. Hard - strong






13. Forming of metal by compressive force above recrystallization point.






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






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






16. Occurs when the metal is hammered by a vertically moving tool onto a stationary tool






17. 1/4 of the wavelength (higher better)






18. A cable made of optical fibers that can transmit large amounts of information at the speed of light






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






20. Ma/vr x 100/1






21. 100khz






22. Sound waves sent through a material - much like sonar. Internal defects appear because they use more energy to go through it.






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






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






25. 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.






26. An orbit less than 1 -500 km. above the Earth's surface.






27. 0.3%<X<0.6% carbon. mostly pear- lite - heat treatable. 0.4 used in axles






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






29. Area parallel to force






30. 0.6%<X<1% carbon. almost entirely pearlite with cementite x>0.8% for high strength and wear






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






32. Involves heating the piece above Red heat and then letting it cool in air. causes smaller grains






33. 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






34. Usually used together - strengthening and toughness






35. 0.15%<X<0.3% carbon. more pearlite - most common steel. weldable up to 0.2 used in structures






36. Squeezing of the hot metal between two shaped dies excess is cut off






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






38. Load/effort






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






40. 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 developer is then added to it to expose any left over - I.e in the cracks






41. Rubbers






42. When upper die is dropped on bottom






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






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






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






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






47. Good toughness and fatigue. high strength structures






48. Controlled cooling after heating metal to attain a degree of hardness. removes internal stresses






49. Better properties that would come from machining






50. Low pressure

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