Question

question 14 (1 point)
which insulation is best suited for extremely high-temperature furnaces and boilers?

fiberglass
polystyrene
ceramic fiber
pvc board

question 15 (1 point)
which ppe protects against sharp sheet metal edges? (select all that apply.)

kevlar gloves
long sleeves or coveralls
nitrile exam gloves
steel-toed boots

question 16 (1 point)
a 4\ iron pipe has an outside radius of 2-1/4\. what is the circumference?

Explanation:

Analyze insulation for high-temperature furnaces and boilers

• Fiberglass: limited to around \(540^\circ\text{C}\) (\(1000^\circ\text{F}\)).
• Polystyrene: organic polymer, melts at low temperatures.
• Ceramic fiber: rated for extremely high temperatures up to \(1260^\circ\text{C}\) (\(2300^\circ\text{F}\)) or higher, ideal for furnaces.
• PVC board: plastic, melts/degrades at low temperatures.

Determine PPE for sharp sheet metal edges

• Kevlar gloves: highly cut-resistant, directly protects hands from sharp edges.
• Long sleeves or coveralls: protects arms from accidental cuts and scrapes.
• Nitrile exam gloves: thin, easily punctured, offers no cut protection.
• Steel-toed boots: protects feet from heavy falling objects, not arms/hands from sharp edges.

Calculate circumference of the iron pipe

• Given outside radius \(r = 2\frac{1}{4}\text{ inches} = 2.25\text{ inches}\).
• Formula for circumference: \(C = 2\pi r\).
• Calculation:

$$ C = 2 \times \pi \times 2.25 = 4.5\pi \approx 14.137\text{ inches} $$

Answer:

Question 14

• (A) Fiberglass
• (B) Polystyrene
• (C) Ceramic fiber (Correct answer)
• (D) PVC board

Question 15

• (A) Kevlar gloves (Correct answer)
• (B) Long sleeves or coveralls (Correct answer)
• (C) Nitrile exam gloves
• (D) Steel-toed boots

Question 16

• (A) 9.42 inches
• (B) 14.13 inches (Correct answer)