The part of a gating system which regulates the rate of pouring of molten metal is
A cylindrical job with diameter of 200 mm and height of 100 mm is to be cast using modulus method of riser design. Assume that the bottom surface of cylindrical riser does not contribute as cooling surface. If the diameter of the riser is equal to its height, then the height of the riser (in mm) is
The dimensions of a cylindrical side riser (height = diameter) for a 25 cm × 15 cm × 5 cm steel casting are to be determined. For the tabulated shape factor values given below, diameter of the riser (in cm) is ______.
A cylindrical blind riser with diameter d and height h, is placed on the top of the mold cavity of a closed type sand mold son as shown in the figure. If the riser is of a constant Volume then the rate of solidification in the riser is the least when the ratio h:d is
In a gating system, the ratio 1:2:4 represents
Match the items in Column I and Column II.
A 200 mm long down sprue has an area of cross – section of 650 mm^{2} 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 × 10^{5} mm^{3}/s. Considering the end of down sprue to be open to atmosphere and an acceleration due to gravity of 10^{4} mm/s^{2}, the area of the down sprue in mm^{2} at its end (avoiding aspiration effect) should be