Which Principle of Heat Exchange Is the Most Important Explanation

question 22

Multiple Choice

Which principle of heat exchange is the most important explanation for why birds look larger in colder weather because they fluff their feathers?

• A)Fluffing feathers results in less cooling by radiation since feathers emit less infrared radiation than other tissues do.
• B)Fluffing decreases the amount of heat lost by conduction when the bird makes contact with cold objects in its environment.
• C)Fluffing creates a pocket of air near the bird that acts as insulation.
• D)Fluffing decreases the surface area/volume ratio,thus decreasing the amount of heat lost to the environment.

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Definitions:

Decreasing Activity Time

A strategy or process of reducing the time required to complete tasks or activities in a project to increase efficiency and possibly reduce overall project duration.

Crash Cost

The additional expenses incurred to reduce the completion time of a project, often through measures such as overtime pay or extra resources.

Crash Duration

The shortest time period in which a task or project can be completed by allocating the maximum resources, often at increased cost.

Project Managers

Professionals responsible for planning, executing, and closing projects, managing resources and ensuring objectives are met.