Unit 6 MCQ:Pressurisation

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Unit 6 MCQ:Pressurisation
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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 6 MCQ:Pressurisation” contains 6 questions across 1 collection.

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02) Where a pressurised enclosure contains no ignition source, which one of the following will suit an area requiring EPL Gb (Cat 2) equipment?

One correct answer

(I) Ex py;✓ Correct answer
(II) No protection required;
(III) Ex px;
(IV) Ex px or Ex pz.

01) For an area requiring EPL Gc (Cat 3) equipment, which one of the following options may be used if the pressurised enclosure contains an ignition source?

One correct answer

(I) No protection required
(II) Ex py;
(III) Ex px;
(IV) Ex px or Ex pz.✓ Correct answer

03) Where a pressurised enclosure contains no ignition source, which one of the following will suit an area requiring EPL Gc (Cat 3) equipment?

One correct answer

(I) Ex py;
(II) No protection required;✓ Correct answer
(III) Ex px;
(IV) Ex px or Ex pz.

04) Levels of protection for pressurised enclosures are?

One correct answer

(I) Ex pi, Ex p2 & Ex p3;
(II) Ex px, Ex py & Ex pz;✓ Correct answer
(III) Ex pG & Ex pD;
(IV) Ex pa, Ex pb or Ex pc.

06) The action required when loss of internal pressurisation occurs in an Ex p enclosure in an area requiring EPL Gc (Cat 3G) is:

One correct answer

(I) Alarm sounds and all flameproof equipment must be isolated;
(II) On operation of alarm, automatic disconnection of all equipment;
(III) No action;
(IV) On operation of alarm, immediate action taken to restore pressurisation.✓ Correct answer

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