1
GATE PI 2014
MCQ (Single Correct Answer)
+1
-0.3
A moving mandrel is used in
A
wire drawing
B
forging
C
tube drawing
D
bending
2
GATE PI 2014
MCQ (Single Correct Answer)
+1
-0.3
In an open die forging, a circular disc is gradually compressed between two flat plates. The exponential decay of normal stress on the flat face of the disc, from the center of the disc towards its periphery, indicates that
A
there is no sticking friction anywhere on the flat face of the disc.
B
sticking friction and sliding friction and sliding friction co-exist on the flat face of the disc
C
the flat face of the disc is friction-less
D
there is only sticking friction on the flat face of the disc.
3
GATE PI 2013
MCQ (Single Correct Answer)
+1
-0.3
In a rolling process, the state of stress of the material undergoing deformation is
A
pure compression
B
pure shear
C
compression and shear
D
tension and shear
4
GATE PI 2012
MCQ (Single Correct Answer)
+1
-0.3
A solid cylinder of diameter $$100$$ $$mm$$ and height $$50$$ $$mm$$ is forged between two frictionless flat dies to a height of $$25$$ $$mm.$$ The percentage change in diameter is
A
$$0$$
B
$$2.07$$
C
$$20.7$$
D
$$41.4$$
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