A cubical casting of molten metal of size 8 mm was found to solidify in 18 s. Calculate the solidification time for a similar cube of radius 10 mm.

A cylindrical riser (height equal to diameter) is designed to feed a steel slab casting of 300×300×100 mm³, Determine the diameter of the riser using Caine’s equation:

A down sprue having height h = 150 mm and cross-sectional area A1 = 450 mm², at inlet is fed at constant head from the pouring basin to maintain the flow rate of molten metal Q = 4.5×10⁵mm³/s. Its lower end is open to the atmosphere. Determine the area of the down-end sprue in mm², at its end to avoiding aspiration effect. Take g =9.8 m/s².

Hardness of green sand mold increases with

With a solidification factor of 0.97×10⁶ s/m², the solidification time (in seconds) for a spherical casting of 200 mm diameter is

Gray cast iron blocks 200×100×10 mm are to be cast in sand molds. Shrinkage allowance for pattern making is 1%. The ratio of the volume of pattern to that of the casting will be

Which of the following engineering materials is

the most suitable candidate for hot chamber die

casting?

A 200 mm long down sprue has an area of cross section

of 650 mm where the pouring basin meets the down sprue (i.e. at the beginning of the down sprue). A constant head of molten metal is maintained by the pouring basin. The molten metal flow rate is 6.5×10⁵, mm³/s.

In a gating system, the ratio of 1:2:4 represents