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2 true and false t for true and f for...

Question: 2 true and false t for true and f for...

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2. True and false (T for true and F for false) (10marks) 1). Alloy is combination, either in solution or compound, of two or more elements, at least one of which is a metal. 2). Pb and Sn can be completely soluble in each other. 3). Y -Fe has a body-centered cubic (BCC) crystal structure; while a -Fe has a face centered cubic crystal structure. 4). Progressive solidification is used to reduce thermal stress, while the simultaneous solidification is applicable to reduce shrinkage cavity. 5). The difference between hot work and cold work is based on temperature about which the recrystallization will happen. 6), Generally, eutectic alloy has good fluidity and is widely used in casting. 7).copper has a body-centered cubic (BCC) crystal structure; while iron has a face centered cubic (FCC) crystal structure. 8). The single crystal has a fixed melting point and freezing point. 9). Phase diagram is obtained in the condition at very slow speed of heating and cooling. 10). Fibers very strong in tension and can provide significant strength improvement to the composite.

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