Fins, or extended surfaces, are commonly used in a variety of engineering applications to enhance cooling. Common examples include a motorcycle or lawn mower engine head, extended surfaces used in electronic equipment, and finned tube heat exchangers in room heating and cooling applications. Consider a rectangular profile of aluminum fins shown in the accompanying figure, which are used to remove heat from a surface whose temperature is 100ºC (T base =100ºC). The temperature of the ambient air is 20ºC. We are interested in determining how the temperature of the fin varies along its length and plotting this temperature variation. For long fins, the temperature distribution along the fin is given by:
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Progress payments are made to the contractor based upon:
A. an estimate of the work done as submitted by the resident project representative. B. a predetermined payment schedule based upon the progress schedule. C. the contractor's estimate of the work done each month. D. invoices submitted to the resident project representative. E. none of the above.
ROM access time is defined as ________
A) being the difference between the READ and WRITE times B) how long it takes to program the ROM chip C) the time it takes to get valid output data after a valid address is applied D) the time required to activate the address lines after the ENABLE line is at a valid level
The scale of the drawings is contained in the _____
A) legend B) title block C) revision block D) approval block
Matching Type
1. Base point 2. Mirror line 3. Angle between objects 4. Start point 5. Page Setup a. Arc b. Mirror c. Array d. Plot e. Rotate