GATE ME 2020 Set 1 — Question 47

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NAT+2 / -0MediumBrakes, Clutches & SpringsMachine ElementsMachine Design

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In a disc-type axial clutch, the frictional contact takes place within an annular region with outer and inner diameters 250 mm250\text{ mm} and 50 mm50\text{ mm}, respectively. An axial force F1F_1 is needed to transmit a torque by a new clutch. However, to transmit the same torque, one needs an axial force F2F_2 when the clutch wears out. If contact pressure remains uniform during operation of a new clutch, and the coefficient of friction does not change, then the ratio F1/F2F_1/F_2 is ________ (round off to 2 decimal places).
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