1
GATE PI 1994
MCQ (Single Correct Answer)
+2
-0.6
According to Chvorinove's rule, the solidification time of a casting is proportional to [Volume/Surface area]n where $$n=....$$
A
$$0.5$$
B
$$1$$
C
$$2$$
D
$$4$$
2
GATE PI 1994
Subjective
+5
-0
A cylinder of $$150mm$$ diameter & $$200mm$$ height is to be cast with out any riser. The cylinder is moulded entirely in the drag of a green sand flask & is top gated. The cope of the flask is $$200mm$$ height & the height of the metal during pouring is $$50mm$$ above the cope. A tapered sprue is employed & the gating ratio is $$1:1.5:2$$. The time taken (in seconds) to fill the casting cavity neglecting energy losses, if the in-gate area is $$400sq.mm$$
3
GATE PI 1994
MCQ (Single Correct Answer)
+1
-0.3
If for a matrix, rank equals both the number of rows and number of columns, then the matrix is called
A
Non-singular
B
singular
C
transpose
D
minor
4
GATE PI 1994
MCQ (Single Correct Answer)
+1
-0.3
The value of the following determinant $$\left[ {\matrix{ 1 & 4 & 9 \cr 4 & 9 & {16} \cr 9 & {16} & {25} \cr } } \right]$$ is
A
$$8$$
B
$$12$$
C
$$-12$$
D
$$-8$$
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