Theory of Machine
The partial balancing of reciprocating parts in locomotives produces

Variation in tractive force along the line of stroke
Swaying couple
All of these
Hammer blow

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

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

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