1.

Gating design for a mould of 50cm*25cm*15cm is shown in below figure. The cross-sectional area of the gate is 5 cm^2. Neglecting friction and velocity distribution effects, what is the filling time (t) for the design (in second)?(a) 19.25(b) 21.86(c) 34.21(d) 10.39

Answer» Correct choice is (b) 21.86

Easy explanation: H (Total height) = 15 cm, from the figure.

v (Velocity of molten metal) = √2gH = √2*981*15 cm/sec = 171.6 cm/sec.

V (Volume of the mould) = 50*25*15 cm³ and A (Cross-sectional area of the gate) = 5 cm^2.

As we know, t = V/Av

So, t (Filling time) = 50*25*15/5*171.6 sec = 21.86 sec.


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