Have a go at answering the Pre-course Self-assessment Questions below. Don't send your answers back to us. Come to you own honest conclusion as to whether or not your understanding of electrical safety is sufficient to enable you to answer 90% of the questions - this means you can only falter on answering 4 of the 43 questions!
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1.Electricity is said to 'flow'. What is it that flows around a circuit? |
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2.What is a Galvanic Isolator? |
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3.What legislative electrical regulations were introduced to UK in 1989? |
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4.A BS 3036 fuse is also known as a …………….Fuse? |
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5.What is the maximum value of an extra low voltage DC system? |
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6.What is the flammable range of hydrogen? |
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7.What is protective equipotential bonding? |
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8.Explain what a DC 2 wire insulated return unearthed system is? |
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9.What is the nominal single phase voltage line to neutral? |
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10. What is the standard UK mains electrical supply frequency? |
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11. What is a typical KW power rating of a bow thruster? |
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12. What is a Residual Current Device (RCD) in relation to electrical equipment? |
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13. Above a current of what value is generally accepted as lethal? |
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14. What is the basic function of an Inverter? |
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15. What is a fuse or circuit breaker designed to protect? |
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16. What are the 5 dangers of electricity? |
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17. Describe how you identify between 12V or 24V battery arrangements? |
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18. What does the IP rating of electrical equipment mean? |
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19. What is the generally accepted minimum number of strands in a multi-strand copper cable? |
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20. What are the 3 general effects of electric current? |
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21. You come across a light blue cable, is this likely to be a live, neutral or earth conductor? |
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22. What is the maximum value of a RCD used for personal protection in the UK? |
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23. What is the capacity of a battery normally measured in? |
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24. Name three types of cable termination that are not suitable in boat electrical systems? |
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25. For a given circuit which is greater - fuse size or cable current carrying capacity? |
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26. What is the lowest value of electric current perceptible by humans? |
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27. What is the fundamental difference between AC and DC? |
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28. What is the purpose of earthing mains AC electrical equipment? |
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29. What is the relative density of hydrogen, compared with that of the air? |
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30. Is it permissible to use the hull of a boat as a return conductor? |
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31. What is the minimum IP rating appropriate to a shore boat inlet connection in any location likely to be subject to the weather or splashing? |
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32. If a Mains shore supply is connected what is the nominal Line to earth Voltage? |
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33. What potential danger may arise if there is more than one shore connection inlet? |
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34. What is an RCBO in relation to electrical equipment? |
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35. What is the generally accepted minimum temperature rating of cables? |
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36. What is an Isolating Transformer and how does it increase safety aboard boats? |
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37. To comply with 1989 Electrical Legislation a BSS Examiner should be what? |
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38. What is the key feature of a deep cycle Marine/Leisure battery? |
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39. When is the use of a double-pole circuit breaker necessary? |
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40. Reducing a cable's cross sectional area does what to the current carrying capacity? |
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41. What are the 3 types of new BS EN 60898 circuit breakers? |
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42. What should be installed if an inverter & shore supply can be energised simultaneously? |
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43. What is galvanic corrosion? |