Metal-casting Questions Set 8:
Disposable patterns are typically made of which material?
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The casting defect caused by the erosion of the sand mold during pouring
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The casting defect that is not caused by high pouring temperature of the melt is
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Two streams of liquid metal which are not hot enough to fuse properly result in a casting defect known as
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What is the main reason for the poor machinability of centrifugally cast iron pipes?
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Gate and runner are integral parts of which of the following types of patterns?
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The purpose of risers in casting is to:
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A gating ratio of 1 : 2 : 4 is used to design the gating system for magnesium alloy casting. This gating ratio refers to the cross-section areas of the various gating elements in the following sequence:
1. Down sprue
2. Runner
3. Ingates
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In the cold chamber die casting process,
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Consider two cross-section areas of a sprue. One is the inlet area (maximum cross-section) and the other is the choke area at a height 'h' below the inlet. Molten metal is dropped at a height 'ht' above the inlet area. What is the correct value of the ratio of the throat area to the inlet area of the sprue? (Assume laminar flow and Bernoulli's principle applies)
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