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What should be the value of biot number (Bi) for chill mould castings?

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What should be the value of biot number (Bi) for chill mould castings?

(a) Less than 1

(b) Greater than 1

(c) Greater than 5

(d) Greater than 11

I got this question in an online interview.

The above asked question is from Rate of Solidification topic in portion Cooling and Solidification of Casting-Forming-Welding I

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The correct choice is (a) Less than 1

The explanation is: Chill mould castings use a massive metal mould with a large thermal capacity or water cooled metal mould, so that biot number (Bi) is always less than 1. When the melt is poured in at a temperature above its melting temperature (Tm), it first cools and then begins solidification when T = Tm.

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