Theory of Machine
Crowning on pulleys helps

Increase belt and pulley life
For automatic adjustment of belt position so that belt runs centrally
In increasing velocity ratio
In decreasing the slip of the belt

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Theory of Machine
Which of the following statement is correct as regard to the difference between a machine and a structure?

The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another
The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only
A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work
All of these

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