Theory of Machine
The indicator using Watt mechanism is known as

Thompson indicator
Richard indicator
Simplex indicator
Thomson indicator

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

The interference is inherently absent.
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.

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