Question

The clutch plate has 160 mm inside and 240 mm outside diameter. The total force provided by the springs is 5 kN, when the clutch is new. The coefficient of friction is 0.4. What is the torque transmitted?

(a) 300 Nm

(b) 350 Nm

(c) 400 Nm

(d) 450 Nm

I had been asked this question during an online exam.

The origin of the question is Transmission System in chapter Chassis & Transmission System of Automobile Engineering

Answer 1

Right answer is (c) 400 Nm

For explanation: inside radius = 80 mm, outside radius = 120 mm ⇒ Effective mean radius = R = (80 + 120) / 2 = 100 mm. Let W = 5 kN = 5000 N and μ = coefficient of friction = 0.4. Torque transmitted = 2 * μ * W * R = 2 * 0.4 * 5000 * 100 = 400 * 10^3 Nmm = 400 Nm.