A mould has downsprue whose length is 20 cm and the cross

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A mould has downsprue whose length is 20 cm and the cross sectional area at the base of the downsprue is 1 cm². The downsprue feeds a horizontal runner leading into the mould cavity of volume 1000 cm³. The time required to fill the mould cavity will be

1. 4.05 s
2. 5.05 s
3. 6.05 s
4. 7.25 s

Correct Option: B

Height of sprue, h = 20 cm = 0.2m
Area of down sprue (Ingate) = 1m² = 1 × 10^–4 m²
Volume of casting = 1000 cm³ (Mould cavity)
Velocity of sprue base V = √2gh = √2 × 9.81 × 0.2 = 1.98 m/s
10^–3 = 10^–4 × 1.98 × t

t =	10^–3 × 10^–4	= 5.05 sec
	1.98