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MCQ: Wiring system

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About this collection

CompEx questions are organised into topic-based sets including Ex d, Ex e, Ex n and intrinsic safety. Select a subject to study at your own pace or complete a timed practice attempt.

“CompEx — MCQ: Wiring system” contains 13 questions across 1 collection.

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Sample questions and answers

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The reduction of static electricity on new plastic cable tray may be reduced by which one of the following:

One correct answer

  • Limiting the cable tray length
  • Limiting the cable tray surface area✓ Correct answer
  • Using braided armour cables
  • Installing IS circuits only on the cable tray
Which one of the following statements represents the asseessment requirements for technicians as given in BS EN60079-14:

One correct answer

  • A degree in electrical engineering
  • Evidence only of having the necessary skills for the scope of work
  • Evidence only of having the necessary skills for the scope of work and competence across the range activities
  • Evidence indicating the necessary skills for the scope of work, competence across the range of activities and relevant knowledge and understanding✓ Correct answer
Which one of the following values, as given in BS EN60079-14, is the limit for the insulation resistance of plastic cable tray in order to avoid static electricity:

One correct answer

  • Greater than 1 MOhm
  • Greater than 1 GOhm
  • Not exceeding 1 GOhm✓ Correct answer
  • Not exceeding 1 MOhm
Before work is carried out in an hazardous location which one of the following is necessary to understand?

One correct answer

  • The manufacturer's documentation
  • The basic requirements for working in the zones of hazardous areas✓ Correct answer
  • Circuit diagrams for panel wiring
  • How the equipment operates
The limitation for installation materials, such as cable tray, in an area requiring EPL Gc rated equipment is?

One correct answer

  • No limitations✓ Correct answer
  • Contains no more than 7.5% aluminium
  • Contains no more than 7.5% aluminium magnesium and titanium
  • Contains no more than 7.5% aluminium magnesium, titanium& zirconium

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