Theory of Machine
Idler pulley is used

For applying tension
For changing the direction of motion of the belt
All of the listed here
For increasing velocity ratio

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Theory of Machine
Sensitiveness of the governor is defined as the ratio of the

Mean speed to the maximum equilibrium speed
Mean speed to the minimum equilibrium speed
Sum of the maximum and minimum equilibrium speeds to the mean speed
Difference of the maximum and minimum equilibrium speeds to the mean speed

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