Combustible gas indicators measure the...

Question 1 / 205eccef9ebacbc34ba4d465ae

Question 1 of 205eccef9ebacbc34ba4d465ae

Combustible gas indicators measure the presence of combustible gas as a percentage of the __________.

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Question 1 of 20

5eccef9ebacbc34ba4d465ae

Combustible gas indicators measure the presence of combustible gas as a percentage of the __________.

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🔍 Key Concepts

• Combustible gas indicator (CGI) purpose and what it actually compares your reading to • Difference between flash point, fire point, and explosive limits • Meaning of LEL (lower explosive limit) and UEL (upper explosive limit) in gas measurements

💭 Think About

• Ask yourself: when a CGI says "20%" on the display, is that 20% of a temperature value, or 20% of some concentration limit? • Which limit is used as the reference point for safety—do we normally stop hot work at some percentage of the lower limit or the upper limit? • Think about which value represents the minimum concentration where an explosion can occur—how would a safety instrument logically be scaled?

✅ Before You Answer

• Verify which term (flash point, fire point, LEL, UEL) refers to a gas concentration in air, not a temperature • Confirm which limit (lower or upper) is the starting point where a mixture first becomes capable of burning or exploding • Recall standard shipboard practice: hot work is usually prohibited above a certain percentage of the critical explosive limit shown on the CGI

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Question 1 of 20

Combustible gas indicators measure the presence of combustible gas as a percentage of the __________.

flash point

lower explosive limit

upper explosive limit

fire point

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Question 1 / 205eccef9ebacbc34ba4d465ae

Question 1 of 205eccef9ebacbc34ba4d465ae

Combustible gas indicators measure the presence of combustible gas as a percentage of the __________.

Back

Question 1 of 20

5eccef9ebacbc34ba4d465ae

Combustible gas indicators measure the presence of combustible gas as a percentage of the __________.

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed