Question

Grain size of the sand particles has no affects on the surface finish of the casting.

(a) True

(b) False

This question was addressed to me during an interview.

My question is from Shell Moulding in section Special Casting Techniques of Casting-Forming-Welding I

Answer 1

The correct answer is:

(b) False

Explanation:

• The grain size of the sand particles used in casting processes, such as shell moulding, does indeed affect the surface finish of the casting. Finer sand grains generally lead to a smoother surface finish because they create fewer gaps and rough edges in the mold. Coarser sand grains can create a rougher surface finish, which may require additional finishing processes after casting.

Thus, the statement that "grain size of the sand particles has no effects on the surface finish of the casting" is false.