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The presence of chills in the mould does not have any affects on the riser mechanism.

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in Casting-Forming-Welding I by (687k points)
The presence of chills in the mould does not have any affects on the riser mechanism.

(a) True

(b) False

I had been asked this question in examination.

I want to ask this question from Riser Placement topic in division Cooling and Solidification of Casting-Forming-Welding I

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Right answer is (b) False

For explanation: The presence of chills in the moulding system greatly affects the riser mechanism. Chills in the mould increase the feeding distance of the riser, which is basically achieved by providing a sharp thermal gradient with the consequent decrease in the feeding resistance of the riser mechanism.

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