1
GATE PI 2010
+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
+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
+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
+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
$$8.41$$
GATE PI Subjects
Engineering Mechanics
Strength of Materials
Theory of Machines
Engineering Mathematics
Machine Design
Fluid Mechanics
Heat Transfer
Thermodynamics
Casting
Joining of Materials
Metal Forming
Machine Tools and Machining
Metrology
Industrial Engineering
EXAM MAP
Joint Entrance Examination