The purpose of clay in a moulding sand is to
A) Act as a binder in the mould
B) Make the mould refractory
C) Mak the mould permeable
Correct Answer:
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Q15: Refractoriness in the moulding sand is due
Q16: Heat treatment of castings is usually done
Q17: Average amount of sand required in a
Q18: On drying, wood
A)expands
B)shrinks
C)changes colour
Q19: Aluminium is not a very good material
Q20: Warped castings may be produced due to
A)poor
Q21: The most efficient shape of a series
Q23: A defect in castings in which a
Q24: Of the following metals, the pouring rate
Q25: Which of the following metal can be
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