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

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

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Theory of Machine
In a four bar chain or quadric cycle chain

Two are turning pairs and two are sliding pairs
One is a turning pair and three are sliding pairs
Three are turning pairs and one is a sliding pair
Each of the four pairs is a turning pair

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