Question

While testing a wheat thresher at recommended throughout, 80 Nm torque is recorded at 750 rpm at the main shaft of the threshing cylinder, which is operated by a 200-mm diameter V pulley. The overload factor and unit mass of V-belt are 1.2 and 0.9 kg/m respectively. At condition of maximum power transfer the maximum tension in V-belt in N is ________

(a) 166.55 N

(b) 233.78 N

(c) 120.06 N

(d) 211.23 N

The question was asked in quiz.

This interesting question is from Power Transmission System topic in section Ignition and Power Transmission of Farm Machinery

Answer 1

Correct choice is (a) 166.55 N

For explanation I would say: N = 750 rpm

V = \(\frac{π*0.2*750}{60}\) = 7.854 m/s

M = 0.9 kg/m

Tc = mv^2 = 0.9 * (7.854)^2

Tc = 55.5165 N

At maximum power transmission

Tmax = 3 Tc

Tmax = 3 * 55.5165 = 166.55 N