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Ex e & EX n equipment questionnaire

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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 — Ex e & EX n equipment questionnaire” contains 17 questions across 1 collection.

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A practice exam lasts up to 60 minutes and includes up to 50 questions from the selected collection. Correct answers and results appear after completion.

Sample questions and answers

These examples come from the published collection. Choose Learning to study questions in sequence, or Exam to check your knowledge.

An Ex de motor, with an Ex e terminal box, was installed in 2005. Which one of the following cable glands achieves the minimum installation requirements?

One correct answer

  • An E1W Ex e gland
  • An E1WF Ex d gland
  • An uncertified gland which meets the IP and impact requirements✓ Correct answer
  • An Ex d gland
The Te time of an Ex e motor indicates?

One correct answer

  • The disconnection time limit when stalled after starting from cold
  • The disconnection time limit when stalled after starting from hot✓ Correct answer
  • The run-up time to full speed
  • The mini um time interval between re-starts
An Ex e motor rating plate indicates a tE time of 10 sec for a T4 temp class. What does the 10 second tE time indicate:

One correct answer

  • Full speed is reached by the motor in 10 secs at a T4 ambient temp
  • Restarting of the motor not permitted within 10 sec to avoid the temperature exceedind the T4 temperature class
  • The motor insulation has been tested for 10 secs at the T4 temp
  • If the motor stalls it must be disconnected by its control gear within 10 seconds at its normal operating temperature✓ Correct answer
A steel Ex e enclosure has a threaded entry 10 mm in length. Which one of the following options achieves the minimum installation requirement when fitting an Ex e E1W cable gland?

One correct answer

  • Fit gland✓ Correct answer
  • Fit gland, external IP washer and internal serrated washer
  • Fit gland, external IP washer and internal lock nut
  • Fit gland, earth tag, serrated washer and internal lock nut
The minimum IP rating for Ex e equipment is?

One correct answer

  • IP64
  • IP6X
  • IP44
  • IP54✓ Correct answer

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