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Which of the followings is the formula for calculating the choke area (A)?

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Which of the followings is the formula for calculating the choke area (A)?

(a) 2W/dtC√2gh

(b) W/dtC√2gh

(c) W²/dtC√2gh

(d) 2W³/dtC√2gh

I had been asked this question during an online exam.

This interesting question is from Gating Design in chapter Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

1 Answer

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The correct option is (b) W/dtC√2gh

Easiest explanation: Choke area (A) = W/dtC√2gh, It is the main control area which meters the metal flow into the mould cavity so that the mould is completely filled within the calculated pouring time. Its unit is mm².

Where, W = Casting mass (kg), t = pouring time (second), d = mass density (kg/mm³),

 h = Sprue height (mm), g = Acceleration due to gravity (mm/s²), C = Efficiency factor.

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