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MCQ: Flameproof Ex d

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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: Flameproof Ex d” contains 26 questions across 1 collection.

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Sample questions and answers

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A function (live) test on a flameproof enclosure after some internal adjustments requires which one of the following as minimum requirement?

One correct answer

  • Fit only the corner bolts and apply a "Danger Live" notice
  • All bolts to be replaced- spanner tight- and flamepath gaps checked✓ Correct answer
  • Only one bolt fitted to support the cover and a :Danger Live" notice
  • Leave cover off, apply a "Danger Live" notice and make sure inadvertent contact with live parts is avoided
2) Which one of the following may be applied in the gap of a flameproof flanged joint to improve the IP rating?

One correct answer

  • (I) Thermosetting sealant;
  • (II) Non setting grease;✓ Correct answer
  • (III) Non-hardening grease bearing textile tape;
  • (IV) Any oil based paint.
Fitting new (metric thread) cable glands to older flameproof equipment, with imperial thread forms at cable gland entries, may be achieved by?

One correct answer

  • Re-tapping the entries using a metric tap the same size as the gland
  • Using an Exd adaptor with appropriate thread forms✓ Correct answer
  • Fitting threaded inserts after drilling
  • Fitting the metric glamd as far as possible with the aim of achieving five-full threads engagement
11) One of the design features of flameproof enclosures is?

One correct answer

  • (I) Electric field strength;
  • (II) A gas detector and alarm arrangement;
  • (III) Flanged and/or spigot joints;✓ Correct answer
  • (IV) An IP67 ingress protection level.
Obstruction of the flamepath openings of the flanged joints of Ex d enclosure by solid obstructions requires minimum clearance depending on the equipment group. For a IIC enclosure this not less than?

One correct answer

  • 30 mm
  • 40 mm✓ Correct answer
  • 10 mm
  • 50 mm

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