GATE Questions & Answers of Riser and Gating Design

What is the Weightage of Riser and Gating Design in GATE Exam?

Total 7 Questions have been asked from Riser and Gating Design topic of Casting, Forming and Joining Processes subject in previous GATE papers. Average marks 1.71.

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 ______.

Shape factor 2 4 6 8 10 12
Raiser volume/ Casting volume 1.0 0.70 0.55 0.50 0.40 0.35

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.

Column I Column II
P.  Metallic Chills 1.  Support for the core
Q. Metallic Chaplets 2.  Reservoir of the molten metal
R. Riser 3.  Control cooling of critical sections
S. Exothermic Padding 4.  Progressive solidification

A 200 mm long down sprue has an area of cross – section of 650 mm2 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. Considering the end of down sprue to be open to atmosphere and an acceleration due to gravity of 104 mm/s2, the area of the down sprue in mm2 at its end (avoiding aspiration effect) should be