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The maximum possible draft in cold rolling of sheet increases with the
1. Increase in coefficient of friction
2. Decrease in coefficient of friction
3. Decrease in roll radius
4. Increase in roll velocity

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Correct Answer - Option 1 : Increase in coefficient of friction

Concept:

Maximum possible draft is given by:

Δhmax = μ2

where μ = coefficient of friction and R = radius of roller.

The maximum possible draft can be increased by:

  • Increasing the coefficient of friction.
  • increasing the radius of roller.

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