1
GATE PI 2003
MCQ (Single Correct Answer)
+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
$$49$$ $$mm$$
2
GATE PI 2003
MCQ (Single Correct Answer)
+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
$$49$$ $$mm$$
3
GATE PI 1993
Subjective
+5
-0
Calculate the minimum number of hot rolling passes necessary to reduce an ingot of $$200mm$$ thickness to $$100mm$$ thickness in two high reversible rolling mill with roll diameter is $$500$$ $$mm.$$ The coefficient of friction between the rolls and the hot material is assumed as $$0.20.$$
4
GATE PI 1990
MCQ (Single Correct Answer)
+5
-1.5
A steel wire of length $$100$$ $$m$$ and diameter $$12.214$$ $$mm$$ is drawn to a final diameter of $$10mm.$$ Tensile tests of specimen made before and after the drawing operation gave yield stress as $$200$$ $$MPa$$ and $$400$$ $$MPa$$ respectively,

The length of drawn wire is

A
$$100$$ $$m$$
B
$$125$$ $$m$$
C
$$150$$ $$m$$
D
$$175$$ $$m$$
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