SSC JE Mechanical Engineering 2013 Paper

When pulley is running the belt in transmitting torque or power from one pulley to another, hence the net tension $\left({\mathit{T}}_1+{\mathit{T}}_2\right)$ is greater than the net tension $\left(2{\mathit{T}}_0\right)$ when pulley are stationary.
Power $=\left({\mathit{T}}_1-{\mathit{T}}_2\right)\mathit{v}$