1
GATE ME 2006
+2
-0.6
In a sand casting operation, the total liquid head is maintained constant such that it is equal to the mould height. The time taken to fill the mould with a top gate is $${t_A}.$$ If the same mould is filed with a bottom gate, then the time taken is $${t_B}.$$ Ignore the time required to fill the runner and frictional effects. Assume atmospheric pressure at the top molten metal surfaces. The relation between the $${t_A}$$ and $${t_B}$$ is
A
$${t_B} = \sqrt 2 .{t_A}$$
B
$${t_B} = 2.{t_A}$$
C
$${t_B} = {{{t_A}} \over {\sqrt 2 }}$$
D
$${t_B} = 2\sqrt 2 .{t_A}$$
2
GATE ME 2005
+2
-0.6
A mould has a downsprue whose length is $$20$$ $$cm$$ and the cross sectional area at the base of the down sprue is $$1\,\,c{m^2}.$$ The down sprue feeds a horizontal runner leading into the mould cavity of volume $$1000\,\,c{m^3}.$$ The time required to fill the mould cavity will be
A
$$4.05$$ s
B
$$5.05$$ s
C
$$6.05$$ s
D
$$7.25$$ s
3
GATE ME 2005
+2
-0.6
Match List - $${\rm I}$$ (products) with List - $${\rm II}$$ (casting process) and select the correct answer using the codes given below the lists
A
$$A - 3,\,\,B - 2,\,\,C - 4,\,\,D - 5$$
B
$$A - 1,\,\,B - 3,\,\,C - 4,\,\,D - 5$$
C
$$A - 1,\,\,B - 2,\,\,C - 3,\,\,D - 4$$
D
$$A - 3,\,\,B - 2,\,\,C - 5,\,\,D - 4$$
4
GATE ME 2004
+2
-0.6
Gray cast iron blocks $$200 \times 100 \times 10\,\,mm$$ are to be cast in sand moulds. Shrinkage allowance for pattern making is $$1$$%. The ratio of the volume of pattern to that of the casting will be
A
$$0.97$$
B
$$0.99$$
C
$$1.01$$
D
$$1.03$$
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