MCQ: Unit 07 - Intrinsic Safety

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MCQ: Unit 07 - 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 — MCQ: Unit 07 - Intrinsic Safety” contains 26 questions across 1 collection.

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Sample questions and answers

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1) Which one of the following locations may Ex ib equipment be used?

One correct answer

(I) EPL Gc (Cat 3G) only;
(II) EPL’s Gb & Gc (Cat’s 2G & 3G);✓ Correct answer
(III) EPL Ga (Cat 1G);
(IV) EPL’s Ga, Gb & Gc (Cat’s 1G, 2G&3G);

24) When IS and non-IS terminals are fitted in the same enclosure the minimum clearance between the live-parts of the two terminal types is required to be?

One correct answer

(I) 50mm;✓ Correct answer
(II) 40mm:
(III) 6mm;
(IV) 3mm.

13) The minimum clearance between IS terminals and earth is?

One correct answer

(I) 30mm
(II) 50mm
(III) 3mm✓ Correct answer
(IV) 6mm

19) Which one of the following components may be considered simple apparatus for use in an IS Ccircuit?

One correct answer

(I) 0.1 kW motor;
(II) an L.E.D;✓ Correct answer
(III) a 9 V battery;
(IV) an electronic relay.

5) The minimum cross-sectional area of a single IS earth conductor is?

One correct answer

(I) 6.0 mm2
(II) 16.0 mm2
(III) 1.5 mm2
(IV) 4.0 mm2✓ Correct answer

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