1
GATE PI 2011
+1
-0.3
Which of the following casting processes uses expandable pattern and expandable mold
A
Shell mod casting
B
Investment casting
C
Pressure die casting
D
Centrifugal casting
2
GATE PI 2011
+2
-0.6
In a sand casting process, a sphere and a cylinder of equal volumes are separately cast from the same molten metal under identical conditions. The height and diameter of the cylinder are equal. The ratio of the solidification time of the sphere to that of the cylinder is
A
$$1.14$$
B
$$0.87$$
C
$$1.31$$
D
$$0.76$$
3
GATE PI 2011
+1
-0.3
The eigen values of the following matrix $$\left[ {\matrix{ {10} & { - 4} \cr {18} & { - 12} \cr } } \right]$$ are
A
$$4,9$$
B
$$6,-8$$
C
$$4,8$$
D
$$-6,8$$
4
GATE PI 2011
+2
-0.6
If a matrix $$A = \left[ {\matrix{ 2 & 4 \cr 1 & 3 \cr } } \right]$$ and matrix $$B = \left[ {\matrix{ 4 & 6 \cr 5 & 9 \cr } } \right]$$ the transpose of product of these two matrices i.e., $${\left( {AB} \right)^T}$$ is equal to
A
$$\left[ {\matrix{ {28} & {19} \cr {34} & {47} \cr } } \right]$$
B
$$\left[ {\matrix{ {19} & {34} \cr {47} & {28} \cr } } \right]$$
C
$$\left[ {\matrix{ {48} & {33} \cr {28} & {19} \cr } } \right]$$
D
$$\left[ {\matrix{ {28} & {19} \cr {48} & {33} \cr } } \right]$$
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