Metal-casting Questions Set 25:
What material is commonly used to make disposable patterns?
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With a solidification factor of 0.97 × 10^6 s/m2, the solidification time (in seconds) for a spherical casting of 200 mm diameter is
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A casting defect caused by low green strength of the sand, where a portion of the sand breaks away from the mold, is known as
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What is the effect on permeability if the sand is too fine?
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Negative allowance is provided on the pattern to take care of the shake allowance.
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The centrifugal casting method is used for casting articles of what type of shape?
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In which of the following casting methods is the molten metal poured and allowed to solidify while the mold is revolving?
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Which type of crystals are formed near the mold face during solidification of a liquid metal?
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A cubic casting of 50 mm side undergoes volumetric solidification shrinkage of 4% and volumetric solid contraction of 6%. No riser is used. Assume uniform cooling in all directions. The side of the cube after solidification and contraction is:
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We have to design an open cylindrical riser for a sand mold. The dimensions of the plate on which the part is to be cast are 150 mm x 150 mm x 50 mm. The total solidification time for the casting will be 5 minutes. The height-to-diameter ratio of the riser is 1. What is the diameter of the riser so that the total solidification time will be 40% longer than the casting?
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