Question

The power transmitted by means of belt drives depends upon :

1. Velocity of the belt
2. Tension under which the belt is placed on the pulleys
3. Arc of contact between the belt and the smaller pulley
4. All of the above 

Answer 1

Correct Answer - Option 4 : All of the above 

Explanation:

Power transmitted in a belt-drive depends on the following factors:

1. The linear velocity of the belt
2. Tension under which belt is placed on the pulleys.
3. The contact area between the belt and the smaller pulley. The contact area is measured by measuring the arc of contact between the belt and pulley.

Power transmitted in belt drive is:

P = (T1 - T2) V

where, T1 = friction tension on the tight side, T2 = friction tension on the slack side

for Flat Belt:

\(\frac{T_1}{T_2} = e^{μθ}\)

for V belt:

\(\frac{T_1}{T_2} = e^{\frac{μθ}{sin\ \alpha}}\)

where μ = coefficient of friction between the belt and the pulley.

θ = angle of lap or contact of the belt over the pulley.