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A pattern carries which allowance for internal and external surfaces?

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in Casting-Forming-Welding I by (687k points)
A pattern carries which allowance for internal and external surfaces?

(a) Shrinkage allowance

(b) Machining allowance

(c) Distortion allowance

(d) Draft allowance

This question was addressed to me in a national level competition.

This intriguing question originated from Pattern Allowances topic in section Preventive Maintenance in Foundries & Metal Casting Process of Casting-Forming-Welding I

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Right answer is (d) Draft allowance

The explanation: Draft allowance is also known by the name of tapering allowance, as the diameter of the cast goes on increasing in a trapezoidal shape from the bottom. A pattern has a draft allowance of an order of 1 and 3 degrees for external and internal surfaces respectively.

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