a. Describe (in a few words) ten different types of engineered devices and systems (e.g., computers, highway systems, security systems, food-processing systems, fire extinguishers).
b. Next, evaluate one of the components in each of these systems that depends upon the decisions made by a design engineer. In particular, compose a list of possible questions that might be asked by the engineer about each of these components as the system designs were developed. For example, a fire extinguisher should be reliable so that it will work whenever needed; among the design elements that the engineer then must consider in order to ensure such reliability is the valve to be used in the device. The engineer might need to ask [and answer) such questions as:
■ Will this valve clog or otherwise fail under certain extreme conditions?
■ What are these extreme conditions? (High temperatures? High or low viscosities for the chemical compound) used in the extinguisher? High moisture levels? High dust levels? Others?)
■ Why would the valve fail under such extremes? ° What can be done to prevent such failure?
c. Finally, try to imagine what types of knowledge are needed for the design engineer to answer each of the questions that you generated (e.g., in the case of a fire extinguisher, he or she would need to have some knowledge of fluid behavior, chemistry, valve mechanisms, etc.). Compose a list of these different types of knowledge.
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