1
GATE PI 2003
MCQ (Single Correct Answer)
+2
-0.6
A casting of size $$100\,\,mm \times 100\,\,mm \times 50\,\,mm$$ is required. Assume volume shrinkage of casting $$2.6\% $$. If the height of the riser is $$80$$ $$mm$$ and riser volume desired is $$4$$ times the shrinkage in casting, what is the appropriate riser diameter in $$mm?$$
A
$$14.38$$
B
$$20.34$$
C
$$28.76$$
D
$$57.52$$
2
GATE PI 2003
MCQ (Single Correct Answer)
+2
-0.6
Chapters are placed between mould and core surfaces in order to :
A
Reduce directional solidification
B
Help local alloying of molten metal
C
Help easy removal of core from casting
D
Prevent core movement due to buoyancy
3
GATE PI 2003
MCQ (Single Correct Answer)
+1
-0.3
Which one of the following is NOT a property of a sand mold?
A
Permeability
B
Collapsibility
C
Strength
D
Fluidity
4
GATE PI 2003
MCQ (Single Correct Answer)
+1
-0.3
In resistance welding, heat is generated due to the resistance between
A
electrode and work piece
B
asperities between touching plates
C
two dissimilar metals being in contact
D
inter-atomic force s
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