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For a casting with a high area to volume (A/V) ratio, one central riser can be enough to feed the entire casting.

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in Casting-Forming-Welding I by (687k points)
For a casting with a high area to volume (A/V) ratio, one central riser can be enough to feed the entire casting.

(a) True

(b) False

I got this question during an online exam.

I'm obligated to ask this question of Riser Placement topic in division Cooling and Solidification of Casting-Forming-Welding I

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Best answer
Right choice is (b) False

Explanation: Normally, for casting with a high area to volume (A/V) ratio (for example, for a plate and a bar), usually more than one riser is required. And for the low area to volume (A/V) ratio casting like cube and sphere, one central riser can be used to feed the entire casting. In such cases, the proper location of the riser is decided.

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