Theory of Machine
Which one of the following can completely balance several masses revolving in different planes on a shaft?

Two equal masses in any two planes
A single mass in one of the planes of the revolving masses
A single mass in different planes
Two masses in any two planes

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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

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

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