1
GATE PI 2005
+2
-0.6
A level having $${90^0}$$ bend is to be produced by drop forging using mild steel bar as raw material. The various operations to be performed on it during forging are:
$$P$$ - Cutting;
$$Q$$ - Bending;
$$R$$ - Fullering;
$$S$$ - Blocking cum finishing;
$$T$$ - Edgering

The correct sequence for performing the operations is:

A
$$P - Q - R - T - S$$
B
$$R - T - Q - S - P$$
C
$$T - R - S - Q - P$$
D
$$R - Q - T - S - P$$
2
GATE PI 2005
+2
-0.6
A round billet made of brass is to be extruded (extrusion constant $$=250$$ $$MPa$$ ) at $${700^ \circ }C.$$ The billet diameter is $$100$$ $$mm$$ and the diameter of the extrusion is $$50$$ $$mm.$$ The extrusion force required (in $$MN$$) is
A
$$1.932$$
B
$$2.722$$
C
$$3.423$$
D
$$4.650$$
3
GATE PI 2005
+2
-0.6
The true stress-true strain curve is given by $$\sigma = 1400\,{\varepsilon ^{0.33}},$$ where the stress $$\sigma$$ is in $$MPa.$$ The true stress at maximum load (in $$MPa$$) is
A
$$971$$
B
$$750$$
C
$$698$$
D
$$350$$
4
GATE PI 2005
+2
-0.6
Assertion (A) : Cold working of metals result in increase of strength and hardness.
Reason (R) : Cold working reduces the total number of dislocations per unit volume of the material.
A
Both $$A$$ and $$R$$ are individually true and $$R$$ is the correct explanation of $$A$$
B
Both $$A$$ and $$R$$ are individually true but $$R$$ is not the correct explanation of $$A$$
C
$$A$$ is true but $$R$$ is false
D
$$A$$ is false but $$R$$ is true
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