Answer :
Sure! Let's break down the question step-by-step to understand what the label 5A:25B on a fire extinguisher indicates:
1. Understanding the Label Components:
- Class A Fires: These involve ordinary combustibles like wood, paper, and cloth.
- Class B Fires: These involve flammable liquids like gasoline, oil, and paint.
2. Class A Rating (5A):
- The "5A" rating means the extinguisher has the firefighting capacity equivalent to 5 gallons of water for Class A fires.
- This rating does not directly relate to a coverage area in square feet but rather indicates the effectiveness in comparison to water.
3. Class B Rating (25B):
- The "25B" rating indicates that the extinguisher can cover an area of 25 square feet for Class B fires.
- This means the extinguisher is effective in extinguishing flammable liquid fires over a specific area.
Given these explanations, let's look at the provided choices:
- Option A: Incorrect. This option suggests the extinguisher will be effective on fires where electrical equipment is burning (which would be Class C fires). The label "5A:25B" does not specify Class C fire effectiveness.
- Option B: Incorrect. This option suggests the extinguisher is the equivalent of 25 gallons (94.6 liters) of water on Class A fires. The correct equivalence for Class A here is 5 gallons.
- Option C: Incorrect. This option suggests the extinguisher will cover 10 square feet of Class A fires, but Class A coverage is not measured by square feet.
- Option D: Correct. This option indicates the extinguisher will cover 25 square feet (2.32 square meters) of Class B fires, which matches the "25B" classification.
Therefore, the correct answer is:
D. The extinguisher will cover 25 square feet (2.32 square meters) of Class B fires.
1. Understanding the Label Components:
- Class A Fires: These involve ordinary combustibles like wood, paper, and cloth.
- Class B Fires: These involve flammable liquids like gasoline, oil, and paint.
2. Class A Rating (5A):
- The "5A" rating means the extinguisher has the firefighting capacity equivalent to 5 gallons of water for Class A fires.
- This rating does not directly relate to a coverage area in square feet but rather indicates the effectiveness in comparison to water.
3. Class B Rating (25B):
- The "25B" rating indicates that the extinguisher can cover an area of 25 square feet for Class B fires.
- This means the extinguisher is effective in extinguishing flammable liquid fires over a specific area.
Given these explanations, let's look at the provided choices:
- Option A: Incorrect. This option suggests the extinguisher will be effective on fires where electrical equipment is burning (which would be Class C fires). The label "5A:25B" does not specify Class C fire effectiveness.
- Option B: Incorrect. This option suggests the extinguisher is the equivalent of 25 gallons (94.6 liters) of water on Class A fires. The correct equivalence for Class A here is 5 gallons.
- Option C: Incorrect. This option suggests the extinguisher will cover 10 square feet of Class A fires, but Class A coverage is not measured by square feet.
- Option D: Correct. This option indicates the extinguisher will cover 25 square feet (2.32 square meters) of Class B fires, which matches the "25B" classification.
Therefore, the correct answer is:
D. The extinguisher will cover 25 square feet (2.32 square meters) of Class B fires.
