Theory of Machine
In which of the following type of gear train the first gear and the last gear are co-axial.

Compound gear train
None of the listed here
Simple gear train
Reverted gear train

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Theory of Machine
Which of the following statement is correct for involute gears?

The variation in centre distance of shafts increases radial force.
The pressure angle is constant throughout the teeth engagement.
A convex flank is always in contact with concave flank.
The interference is inherently absent.

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Theory of Machine
In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done

Because of loose contact of follower with cam surface
Because the uniform velocity motion is a partial parabolic motion
In order to have acceleration in beginning and retardation at the end of stroke within the finite limits
Because of difficulty in manufacturing cam profile

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