Engineering Studies
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Avg score: 72% • Most missed: “Used where scarifical anodes cannot supply enough protection - offshore oil rigs…”
Engineering Studies
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25 Questions

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

2. 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

3. 1%
4. 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

5. 0.6%0.8% for high strength and wear

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

7. When upper die is dropped on bottom

8. 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.

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

10. 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

11. 100GHZ+

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

13. Hard - brittle

14. Difference/original

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

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

17. AC to DC

18. Ma/vr

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

20. Vertical

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

22. Ma/vr x 100/1

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

24. Good wear - case hardening. ball bearings

25. Area parallel to force

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