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MCQ: UNIT-1, General Principies

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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: UNIT-1, General Principies” contains 15 questions across 1 collection.

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Sample questions and answers

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The numbers after the letters IP in the ingress protection codes represent?

One correct answer

  • Solid particles and mechanical protection
  • Supply voltage and water pressure
  • Solid particles and water✓ Correct answer
  • Dust particle size and condensation
The property of flammable material which is considered in order to determine the appropriate T-rating for equipment is?

One correct answer

  • The upper flammable limit of the material
  • The material sub-division
  • The ignition temperature of the material✓ Correct answer
  • The flashpoint of the material
A zone 2 area is where an explosive gas / air mixture is?

One correct answer

  • Is likely to be present during normal operation occasionally
  • Continuously present or present long periods
  • Not present during normal operation
  • Not likely to occur in normal operation, and if it does occur is likely to do so only infrequently and will exit for a short period only✓ Correct answer
In which one of the following zones is an explosive gas / air mixture unlikely to occur in normal operation, but if it does occur, will persist for a short period only?

One correct answer

  • Zone 1
  • Zone 2✓ Correct answer
  • Zone 22
  • Zone 0
The number of temperature classes for marking explosion protected equipment is?

One correct answer

  • 8
  • 4
  • 6✓ Correct answer
  • 5

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