Theory of Machine
The partial balancing means

Best balancing of engines
Balancing partially revolving masses
All of these
Balancing partially reciprocating masses

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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

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

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