निष्क्रिय पुली का प्रयोग निम्न में से किसके लिए किया जाता है?

Concept:

There are two advantages of using an idler pulley:

• Initial tension in the belt can be increased from time to time by adjusting the position of adjustable weight or by increasing the adjustable weight value. Due to increase in initial tension, power transmitting capacity of belt drive gets increased.
• Angle of contact on the smaller pulley increases which further increases the ration between friction tension on both the sides because `T1T2T1T2 = eθeθ. Hence, in effect power transmitting capacity of belt drive gets further increased.