Theory of Machine
In involute gears, the pressure angle is

Always variable
Always constant
Dependent on the size of gears
Dependent on the size of teeth

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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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