The Critical Radius of Insulation for a Spherical Shell Is

question 18

Multiple Choice

The critical radius of insulation for a spherical shell is (where, K = thermal conductivity of insulating material h₀ = heat transfer coefficient at the outer surface)

• A)K/h₀
• B)2K/h₀
• C)h₀/K
• D)h₀/2K

---

Definitions:

Crayon

A stick of colored wax, chalk, or charcoal for drawing or coloring.

Symbolic Function

The ability to use symbols, words, or objects to represent something that is not physically present.

Preoperational Thought

A stage in Piaget’s theory of cognitive development where children (ages 2-7) are able to engage in symbolic play and make intuitive guesses, but their thinking is not yet logical.

Intuitive Thought

A form of thinking that relies on a direct and immediate understanding or perception of situations, independent of conscious reasoning processes.