Theory of Machine
When the axes of the first and last wheels are coaxial, then the train is known as

Epicyclic gear train
Compound train of wheels
Simple train of wheels
Reverted gear train

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Theory of Machine
Crowning on pulleys helps

Increase belt and pulley life
In increasing velocity ratio
In decreasing the slip of the belt
For automatic adjustment of belt position so that belt runs centrally

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Theory of Machine
In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon

Total lift, centre of gravity of the cam and cam speed
Total lift, total angle of lift, minimum radius of cam and cam speed
Radius of circular arc, cam speed, location of centre of circular arc and roller diameter
Mass of cam follower linkage, spring stiffness and cam speed

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