belt drives mechanisms

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The following data refer to an open belt drive :

Diameter of larger pulley = 400 mm ; Diameter of smaller pulley = 250 mm ; Distance

between two pulleys = 2 m ; Coefficient of friction between smaller pulley surface and belt = 0.4 ;

Maximum tension when the belt is on the point of slipping = 1200 N.

Find the power transmitted at speed of 10 m/s. It is desired to increase the power. Which of

the following two methods you will select ?

1. Increasing the initial tension in the belt by 10 per cent.

2. Increasing the coefficient of friction between the smaller pulley surface and belt by 10 per

cent by the application of suitable dressing on the belt.

Find, also, the percentage increase in power possible in each case.

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