Theory of Machine
Under logarithmic decrement, the amplitude of successive vibrations are

In arithmetic progression
Constant
In logarithmic progression
In geometric progression

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Theory of Machine
In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, this method will

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

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