Theory of Machine
When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

Under damped vibration
Free vibration
Damped vibration
Forced vibration

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

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