Theory of Machine
The Bifilar suspension method is used to determine

Natural frequency of vibration
Moment of inertia
Centripetal acceleration
Position of balancing weights

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Theory of Machine
In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will

Reduce maximum opening of port to steam
All of these
Reduce length of effective stroke of piston
Cause withdrawing or throttling of steam

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