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Reaction with Water/ Steam

Which of the ...

Question

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 pouring 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.

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Solution

Skim bob is used for separating the lighter and heavier impurities.
Liquid and solidification shrinkage are compensated by riser. Solid shrinkages are taken care of by oversized patterns.

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Q. Match List I with List II and select the correct answer using the code given below the lists:

\begin{matrix} List-I & List-II P. & Strainer. & 1. & Reduce dross Q. & Splash core. & 2. & Separate lighter and heavier impurities R. & Skim bob. & 3. & Avoids aspiration S. & Tapered sprue. & 4. & Avoids and erosion \end{matrix}

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