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UNIT-7 MCQ: Intrinsic Safety

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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-7 MCQ: Intrinsic Safety” contains 25 questions across 1 collection.

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Sample questions and answers

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

The maximum resistance of the cables connecting a zener barrier earth bar and the main earth should not exceed?

One correct answer

  • 1 Ohm✓ Correct answer
  • 10 Ohm
  • 1 MOhm
  • 100 Mohm
IS cables with screens will have sheathing capable of withstanding which one of the following test voltages?

One correct answer

  • 500 VAC and 750 VDC
  • 500 VAC or 750 VDC✓ Correct answer
  • 1000 V
  • Double the working voltage
The screen of a cable in an IS circuit must be connected to?

One correct answer

  • The main earth conductor
  • The point indicated on the loop (hook up) diagram ??????✓ Correct answer
  • Earth at both ends
  • Earth at one end only
From the following statements, which one has equipment that does not require a dedicated IS earth

One correct answer

  • Barrier used in circuit installed in group IIC gases
  • Zene barrier with output connected in hazardous area
  • 24 v zener barrier
  • Galvanic isolation barrier✓ Correct answer
Which one of the following statements represent what must be considered when selecting cables for an IS circuit

One correct answer

  • The cable inductance and capacitance may be ignored
  • Only the cable inductance is applicable
  • The cable inductance and capacitance is applicable✓ Correct answer
  • Only the cable capacitance is applicable

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