1
GATE PI 1989
+1
-0.3
A
Drawing
B
spinning
C
Extrusion
D
Rolling
2
GATE PI 1989
+1
-0.3
The blank diameter used in thread rolling will be
A
Equal to the major diameter of the thread
B
Equal to the pitch diameter of the thread
C
little higher than the minor diameter of the thread
D
little higher than the pitch diameter of the thread
3
GATE PI 1989
Fill in the Blanks
+1
-0
At the last hammer stroke the excess material from the finishing cavity of a forging die is pushed into .............
4
GATE PI 1989
Subjective
+5
-0
In a wire drawing operation diameter of $$6mm$$ is reduced in stages to a diameter of $$1.34mm.$$ Assuming ideally rigid plastic material and ideally lubricant condition,
$$i)$$$$\,\,\,\,\,\,\,$$ The minimum number of passes required by assuming max reduction per pass
$$\,\,\,\,\,\,\,\,\,\,\,\,$$ is obtained with $$\mu = 0.2$$ and half die angle as $${6^0}$$. If the flow strength of the
$$\,\,\,\,\,\,\,\,\,\,\,\,$$ material is $$60$$ $$MPa.$$

$$ii)$$$$\,\,\,\,\,$$ The diameter of wire after $${2^{nd}}$$ stage

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