1
GATE PI 2005
MCQ (Single Correct Answer)
+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
2
GATE PI 2005
MCQ (Single Correct Answer)
+2
-0.6
Consider the following statements:
In comparison to hot working, in cold working,
$$1.$$ Higher forces are required
$$2.$$ No heating is required
$$3.$$ Less ductility is required
$$4.$$ Better surface finish is obtained.

Which of the statements given above are correct?

A
$$1,$$ $$2$$ and $$3$$
B
$$1,$$ $$2$$ and $$4$$
C
$$1$$ and $$3$$
D
$$2,$$ $$3$$ and $$4$$
3
GATE PI 2004
MCQ (Single Correct Answer)
+2
-0.6
The extrusion process(es) used for the production of toothpaste tubes is / are

$$1.$$ Tube extrusion
$$2.$$ Forward extrusion
$$3.$$ Impact extrusion

A
$$1$$ only
B
$$1$$ & $$2$$
C
$$2$$ & $$3$$
D
$$3$$ only
4
GATE PI 2003
MCQ (Single Correct Answer)
+2
-0.6
Cold working produces the following effects

$$1.$$$$\,\,\,\,\,\,\,\,\,\,\,\,\,\,$$ Stress are set up in the material
$$2.$$$$\,\,\,\,\,\,\,\,\,\,\,\,\,\,$$ Grain structure get distorted
$$3.$$$$\,\,\,\,\,\,\,\,\,\,\,\,\,\,$$ Strength and hardness of the metal are decreased
$$4.$$$$\,\,\,\,\,\,\,\,\,\,\,\,\,\,$$ Surface finish is reduced

A
$$1$$ & $$2$$
B
$$1,$$ $$2$$ & $$3$$
C
$$3$$ & $$4$$
D
$$1$$ & $$4$$
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