1
GATE PI 1991
Subjective
+6
-0
A rectangular block of steel $$C.S$$ $$100\,\, \times \,\,150mm$$ and $$250mm$$ height is to be cast with out any riser. The block is moulded entirely in the drag of a green sand flask & is tap gated. The cope of the flask is $$200mm$$ height & the height of the metal during pouring is $$100mm$$ above the cope level. A tapered sprue is employed & the gating ratio is $$1:4:2$$. Assume no energy losses in the system. The time taken (in seconds) to fill the casting cavity, if the tapered sprues with $$500$$ $$m{m^2}$$ exit area is used.
2
GATE PI 1991
MCQ (More than One Correct Answer)
+1
-0.3
High alloy steel components are preheated before welding for reducing
A
Heat affected zone
B
Total energy consumption
C
Total time of welding
D
Welding stresses
3
GATE PI 1991
Fill in the Blanks
+1
-0
In spot welding of aluminium sheets, the welding current should be .........A........ and weld time should be kept ............B......... than for $$MS$$ sheet of same thickness.

(A). higher / lower, (B). higher / lower

4
GATE PI 1991
Fill in the Blanks
+1
-0
....................... is the non-fusion method of joining dissimilar metals with metals whose melting temp is greater than $${400^ \circ }C$$.
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