Explain bimodal distributions of polymers and their usefulness
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Bimodal distributions have two peak areas in the MWD plot. These two peaks indicate that some lower molecular weight material has been mixed with some higher molecular weight material. This mixing is often done to improve the processability of a material with a high, narrow MWD. The lower molecular weight material will melt at lower temperatures and provide lubrication for the higher molecular weight polymers, thus increasing the ease with which they can be processed.
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?Which of the following is/are true when measuring camshaft duration?
A. SAE specifications are measured after the valve has lifted 0.060". B. High-performance camshafts are usually measured for duration at 0.050" lift. C. ?Both A and B D. ?Neither A nor B
A bowstring truss should use horizontally laminated layers of wood to create the arched top chord, rather than vertically laminated lumber, because _____.
a. the top surface is smoother, creating a better surface for fastening roofing materials b. vertically laminated wood cannot be bent to form the required arch c. the arched chord gains strength from the individual arched layers of wood d. vertically laminated wood cannot be cut into an arched shape
Briefly explain how trees obtain their building blocks for growth
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Describe the advantages of the higher operating temperatures used by Molten Carbonate Fuel Cells (MCFC).
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