1
GATE PI 2010
MCQ (Single Correct Answer)
+2
-0.6
During the filling process of a given sand mould cavity by metal through a horizontal runner of circular $$C.S,$$ the frictional head loss of the molten metal in the runner will increase with the
A
Increase in runner diameter
B
Decrease internal surface roughness of the runner
C
Decrease in length of runner
D
Increase in average velocity of molten metal
2
GATE PI 2009
MCQ (Single Correct Answer)
+2
-0.6
A solid cylinder of diameter $$D$$ and height equal to $$D,$$ and a solid cube of side $$L$$ are being sand cast by using the same material. Assuming there is no super-heat in both the cases, the ratio of solidification times of the cylinder to the solidification time of the cube is
A
$${\left( {L/D} \right)^2}$$
B
$${\left( {2L/D} \right)^2}$$
C
$${\left( {2D/L} \right)^2}$$
D
$${\left( {D/L} \right)^2}$$
3
GATE PI 2008
MCQ (Single Correct Answer)
+2
-0.6
In sand casting of hallow part of lead, a cylindrical core of diameter $$120mm$$ and height $$180mm$$ is placed inside the mould cavity. The densities of core material and lead are $$1600kg/{m^3}$$ and $$11300kg/{m^3}$$ respectively. The net force (in $$N$$) that tends to lift the core during pouring of molten metal will be
A
$$19.7$$
B
$$64.5$$
C
$$193.7$$
D
$$257.6$$
4
GATE PI 2007
MCQ (Single Correct Answer)
+2
-0.6
In a sand casting process, a sprue of $$10mm$$ base diameter and $$250mm$$ height leads to a runner which fills a cubical mold cavity of $$100mm$$ size.

The mold filling time in seconds is

A
$$2.8$$
B
$$5.78$$
C
$$7.54$$
D
$$8.41$$
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