A defect in castings in which a discontinuity is formed due to the imperfect fusion of two streams of metal in the mould cavity is known as
A) scabs
B) hot tears
C) cold shut
D) drops
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
Q22: The purpose of clay in a moulding
Q24: Of the following metals, the pouring rate
Q25: Which of the following metal can be
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