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Which of the following statements are INCORRECT? In casting process: 1. Strainer is used for filtering impurities present in molten metal. 2. Skim bob

Which of the following statements are INCORRECT? In casting process: 1. Strainer is used for filtering impurities present in molten metal. 2. Skim bob is used to avoid sand erosion during poring of molten metal 3. Riser is used for compensating solid shrinkage during solidification. 4. Straight tapered circular cross section sprue is used to avoid aspiration effect. (a) 1 & 2 (b) 2 & 3 (c) 3 & 4 (d) 2 & 4

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