Correct Answer - Option 2 : 0.5
Concept:
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) = \(\frac{N_2}{N_1} = \frac{d_1}{d_2}\)
Calculation:
Given:
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