Question

The torque transmitting capacity of friction clutches can be increased by
1. Use of friction material with a lower coefficient of friction
2. Decreasing the mean radius of the friction disk
3. Increasing the mean radius of the friction disk 
4. Decreasing the plate pressure

Answer 1

Correct Answer - Option 3 : Increasing the mean radius of the friction disk 

Concept:

The torque transmitting capacity of friction clutches is given by

T = μ W R_m

Now the torque transmitting capacity can be increased by

• Increasing μ (coefficient of friction)
• Increasing W (pressure on plate)
• Increasing R_m (mean radius)