The most efficient shape of a series is that which
A) given a minimum heat loss
B) keeps the metal in molten state for longer period
C) both (A) and (B) above
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
Q22: The purpose of clay in a moulding
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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