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The diameter of driver and follower are 30 and 60 cm, respectively. The velocity ratio of a belt drive is given by:
1. 2.5
2. 0.5
3. 2
4. 1.5

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Correct Answer - Option 2 : 0.5


Velocity Ratio of a Belt Drive:

It is the ratio between the velocities of the driver and the follower or driven. Let

d1 = Diameter of the driver, d2 = Diameter of the follower or driven,

N1 = Speed of driver in rpm, N2 = Speed of follower or driven in rpm.

Velocity Ratio (VR) = \(\frac{N_2}{N_1} = \frac{d_1}{d_2}\) 



d1 = 30 cm, d2 = 60 cm.

VR = \(\frac{d_1}{d_2}\) = \(\frac{30}{60} = \frac{1}{2} = 0.5\)

∴ The velocity ratio of a belt drive is 0.5

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