1
GATE PI 1989
+2
-0.6
Shrinkage allowance on pattern is provided to compensate for shrinkage when
A
The temperature of liquid metal drops from pouring to freezing temperature
B
The metal changes from liquid to solid state at freezing temperature
C
The temperature of solid phase drops from freezing to room temperature
D
The temperature of metal drops from pouring to room temperature
2
GATE PI 1989
Subjective
+2
-0
What is the velocity of the steel at the bottom of the sprue if the sprue height is $$30$$ $$cm$$? Assume the frictional and other losses to be $$20\%$$
3
GATE PI 1989
+5
-1.5
Molten aluminium was poured in a sand mold and the thickness of solid skin formed after $$20$$ seconds and $$50$$ seconds were fond to be $$3mm$$ and $$4.5mm$$ respectively. What would be the thickness of the solid skin at the end of $$100$$ seconds after pouring?
A
$$5.5mm$$
B
$$6.19mm$$
C
$$7.1mm$$
D
none
4
GATE PI 1989
Fill in the Blanks
+1
-0
In welding brass with oxy-acetylene flame, the type of flame used is
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