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Engineering Studies

Subject : engineering
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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. 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

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

3. 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.

4. 100khz

5. X<1% silicon no graphite - has carbon/carbide. very brittle

6. Us a metal that is more reactive. It is connect to another metal and corrodes instead of the other metal. the Anode is replaced periodically

7. 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

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

9. Resulting from exposure to damp environments and liquids.

10. A strong hard building material composed of sand and gravel and cement and water

11. Hard - brittle

12. Soft - ductile

13. 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

14. These have weaker secondary bonds which allow the stretching

15. Allows for another signal to be sent along the carrier signal

16. 0.15%<X<0.3% carbon. more pearlite - most common steel. weldable up to 0.2 used in structures

17. Good toughness and fatigue. high strength structures

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

19. Low pressure

20. Load/area

21. x<0.15% carbon. ferrite. good for cold working - rolling sheets

22. 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

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

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

25. AC to DC

26. 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.

27. 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

28. 10MHZ

29. Difference/original

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

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

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

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

34. When upper die is dropped on bottom

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

36. Better properties that would come from machining

37. 100GHZ+

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

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

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

41. Rubbers

42. Area load piston/area of effort piston

43. 1GHZ

44. 0.3%<X<0.6% carbon. mostly pear- lite - heat treatable. 0.4 used in axles

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

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

47. Horizontal

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

49. 1/4 of the wavelength (higher better)

50. 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