Converging passage is used for feeding the liquid molten metal into the mould to
A
avoid aspiration of air
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B
quickly break off the protruding protion of the casting
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C
increase the rate of feeding
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D
decrease wastage of case metal
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Solution
The correct option is A avoid aspiration of air Converging passages are used as sprues to gain in velocity of molten metal as it reduces air aspiration.