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UNIT 6 MCQ: Pressurisation

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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 — UNIT 6 MCQ: Pressurisation” contains 6 questions across 1 collection.

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Sample questions and answers

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Levels of protection for pressurised enclosures are?

One correct answer

  • Ex p1, Ex p2& Ex p3
  • Ex px, Ex py& Ex pz✓ Correct answer
  • Ex pG& Ex pD
  • Ex pa, Ex pb or Ex pc
Where a pressurised enclosure contains no ignition source, which one of the following will suit an area requiring EPL Gb (Cat 2) equipment?

One correct answer

  • Ex py✓ Correct answer
  • No protection required
  • Ex px
  • Ex px or Ex pz
Which one of the following statements represents the type of protection Ex p:

One correct answer

  • The internal pressure has to be greater than 0.5 Bar
  • The air used for pressurisation shall be taken from a specified non-hazardous area✓ Correct answer
  • Pressurisation of the enclosure is intended to contain explosive gases
  • Switching on is only permitted after the enclosure has been pressurised for at least 15 minutes
The action required when loss of internal pressurisation occurs in an Ex p enclosure in an area requiring EPL Gc (Cat 3G) is:

One correct answer

  • Alarm sounds and all flameproof equipment must be isolated
  • On operation of alarm, automatic disconnection of all equipment
  • No action
  • On operation of alarm, immediate action taken to restore pressurisation✓ Correct answer
Where a pressurised enclosure contains no ignition source, which one of the following will suit an area requiring EPL Gc (Cat 3) equipment?

One correct answer

  • Ex py
  • No protection required✓ Correct answer
  • Ex px
  • Ex px or Ex pz

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