1
GATE PI 2008
MCQ (Single Correct Answer)
+2
-0.6
In a rolling process, thickness of a strip is reduced from $$4mm$$ to $$3mm$$ using $$300mm$$ diameter rolls rotating at $$100rpm.$$ The velocity of the strip (in $$m/sec$$) at the neutral point is
A
$$1.57$$
B
$$3.14$$
C
$$47.10$$
D
$$94.20$$
2
GATE PI 2008
MCQ (Single Correct Answer)
+2
-0.6
A $$10mm$$ diameter annealed steel wire is drawn through a die at a speed of $$0.5/sec$$ to reduce the diameter by $$20\% $$. The yield stress of the material is $$800MPa.$$

Neglecting friction and strain hardening, the stress required for drawing (in $$MPa$$) is

A
$$178.6$$
B
$$357.0$$
C
$$1287.5$$
D
$$25.75.0$$
3
GATE PI 2007
MCQ (Single Correct Answer)
+2
-0.6
The maximum possible percentage reduction in area per pass during wire drawing of an ideal plastic material without friction is of the order of
A
$$37$$
B
$$50$$
C
$$63$$
D
$$75$$
4
GATE PI 2006
MCQ (Single Correct Answer)
+2
-0.6
A solid cylindrical stainless steel work piece of $$200mm$$ diameter and $$150mm$$ height. This component is reduced by $$50\% $$ in height with flat die in open die forging. Assuming the flow stress of the material as $$1000$$ $$MPa$$ and the coefficient of friction to be $$0.2,$$ the estimated forging force at the end of the stroke is
A
$$20.8$$ $$kN$$
B
$$31$$ $$kN$$
C
$$78.6$$ $$kN$$
D
$$78.6$$ $$MN$$
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