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GATE 2020: Manufacturing Quiz 2
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Question 1
A cubic casting of 50 mm side undergoes volumetric solidification shrinkage and volumetric solid contraction of 4% and 6% respectively. No riser is used. Assume uniform cooling in all directions. The side of the cube after solidification and contraction is
Question 2
Moulds are made from special sand having specific properties so that defects do not occur. It is normally a mixture of
Question 3
A cast steel slab of dimension 40×20×10 cm, is poured horizontally using side riser. The riser is cylindrical in shape with diameter and height both equal to 20 cm.Then the freezing ratio is ________.
Question 4
A cylindrical top riser of 6 cm diameter and 6 cm height has to be designed for a sand casting mould for producing a steel rectangular plate casting of 7 cm × 10 cm × 2 cm dimensions having the total solidification time of 1.36 minute. The total solidification time (in minute) of the riser is _____
Question 5
The height of the down-sprue is 175 mm and its cross-sectional area at the base is 200 mm2. The cross-sectional area of the horizontal runner is also 200 mm2 assuming no losses, indicate the correct choice for the time (in seconds) required to fill a mold cavity of volume 106 mm3. (Use g = 10 m/s2).
Question 6
With a solidification factor of 0.97 × 106 s/m2, the solidification time (in seconds) for a spherical casting of 200 mm diameter is ________.
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