Podcast Beta
Questions and Answers
Hot and cold rolling are commonly used methods for fabricating metals and alloys. (True/False)
True
A sheet of a 70% Cu – 30% Zn alloy is cold-rolled 20% to a thickness of 3mm, and then further cold-rolled to 2.00mm. The total percent cold work is 46.6%. (True/False)
True
The percent cold reduction when an annealed copper wire is cold drawn from a diameter of 1.27mm to a diameter of 0.813mm is -59%. (True/False)
True
Forging is a method used for obtaining wires and rods with different diameters. (True/False)
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Melting the metal in a furnace is the first step in processing most metals. (True/False)
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When a metal returns to its original dimensions after the force is removed, it has undergone __________ deformation.
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If a metal is deformed to an extent that it cannot fully recover its original dimensions, it is said to have undergone __________ deformation.
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The three principal ways in which a load may be applied are tension, compression, and __________.
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The engineering stress is defined as the average uniaxial tensile force divided by the original cross-sectional area. (True/False)
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Poisson’s Ratio measures a material's ability to compress in the direction parallel to the applied force. (True/False)
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Alloying elements cannot be added to the molten metal to produce alloys. (True/False)
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Cold rolling is used to obtain much thinner sheets than hot rolling. (True/False)
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The total percent cold work for the sheet cold-rolled from 3mm to 2.00mm is 20%. (True/False)
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Cold reduction is calculated by the change in cross-sectional area divided by the original area. (True/False)
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Forging is a method used for obtaining wires and rods with different diameters. (True/False)
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If a piece of metal is deformed to the extent that it cannot fully recover its original dimensions, it is said to have undergone elastic deformation.
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The three principal ways in which a load may be applied are tension, compression, and torsional.
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Engineering stress is defined as the average uniaxial tensile force divided by the original cross-sectional area.
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Poisson’s Ratio measures a material's ability to compress in the direction parallel to the applied force.
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If a rubber band becomes thinner when stretched or thicker when compressed, it has a Poisson’s Ratio of 1.
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