1
GATE PI 2003
+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
$$1$$ & $$4$$
2
GATE PI 2003
+5
-1.5
In a single pass flat rolling operation, a $$400mm$$ wide steel strip having a thickness of $$10mm$$ is reduced to $$8mm$$ by using a roll of $$600mm$$ diameter.

The roll-strip contact length is

A
$$24.5$$ $$mm$$
B
$$34.6$$ $$mm$$
C
$$17.3$$ $$mm$$
D
$$49$$ $$mm$$
3
GATE PI 2003
+5
-1.5
In a single pass flat rolling operation, a $$400$$ $$mm$$ wide steel strip having a thickness of $$10mm$$ is reduced to $$8$$ $$mm$$ by using a roll of $$600mm$$ diameter.

Considering the situation for a maximum draft of the process, what is the coefficient of friction?

A
$$0.082$$
B
$$0.007$$
C
$$17.3$$ $$mm$$
D
$$49$$ $$mm$$
4
GATE PI 2003
+1
-0.3
Which one is not a method of reducing cutting forces to prevent the overloading of press
A
providing shear on die
B
providing shear on punch
C
increasing the clearance
D
stepping punches
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