1
GATE PI 2008
+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
+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
+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
+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
$$78.6$$ $$MN$$
GATE PI Subjects
Fluid Mechanics
Metrology
Theory of Machines
Engineering Mathematics
Heat Transfer
Machine Tools and Machining
Industrial Engineering
Engineering Mechanics
Strength of Materials
Thermodynamics
Machine Design
Casting
Joining of Materials
Metal Forming
EXAM MAP
Joint Entrance Examination