Theory of Machine
The cam follower generally used in aircraft engines is

Roller follower
Knife edge follower
Flat faced follower
Spherical faced follower

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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 maximum opening of port to steam
Reduce length of effective stroke of piston

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