MCQ: Unit 1 - General principles

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MCQ: Unit 1 - General principles
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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 principles” contains 16 questions across 1 collection.

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Sample questions and answers

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1) For which one of the following apparatus sub-groups is ethylene the representative gas?

One correct answer

(I) I;
(II) IIA;
(III) IIB;✓ Correct answer
(IV) IIC;

2) Which one of the following is not required for combustion of a flammable material?

One correct answer

(I) Oxygen;
(II) An enclosure;✓ Correct answer
(III) An ignition source;
(IV) Fuel.

10) Which one of the following sub-divisions is necessary for equipment in an acetylene hazard?

One correct answer

(I) IID;
(II) IIC;✓ Correct answer
(III) IIB;
(IV) IIA.

11) The T-rating, e.g. T5, marked on the certification label of equipment indicates that the surface temperature of the equipment?

One correct answer

(I) Will not reach the flashpoint temperature of the gas in normal operation;
(II) Is designed to reach the temperature represented by the T-rating;
(III) Will not reach the ignition temperature of any dust or gas in normal operation;
(IV) Will not exceed the temperature represented by the T-rating during normal or specified fault conditions✓ Correct answer

3) Spontaneous ignition of a flammable mixture occurs at?

One correct answer

(I) Its fire point;
(II) Its upper ignition temperature;
(III) Its flash point;
(IV) Its ignition temperature.✓ Correct answer

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