Question

question 59

how do most dry powder agents extinguish combustible metals?

cooling the burning material
caking and adhering to the material
interrupting the chemical chain reaction
reacting with the metal to create a noncombustible compound

question 60

application of a class k agent should begin from a distance of:

10 to 12 inches
10 to 12 feet
48 to 50 inches
48 to 50 feet

Explanation:

Analyze Question 59

Using the Dry Powder Agents knowledge point, dry powder agents are designed for Class D combustible metal fires. They extinguish these fires by smothering, which involves caking and adhering to the hot metal surface to exclude oxygen and dissipate heat.

Analyze Question 60

Class K wet chemical agents are used for commercial kitchen grease fires. According to NFPA 10 standards, the application of a Class K agent should begin from a safe distance of 10 to 12 feet to avoid splashing hot grease.

Answer:

Question 59

• Cooling the burning material
• Caking and adhering to the material (Correct answer)
• Interrupting the chemical chain reaction
• Reacting with the metal to create a noncombustible compound

Question 60

• 10 to 12 inches
• 10 to 12 feet (Correct answer)
• 48 to 50 inches
• 48 to 50 feet