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

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

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Theory of Machine
The maximum fluctuation of speed is the

Sum of maximum and minimum speeds
Difference of minimum fluctuation of speed and the mean speed
Difference of the maximum and minimum speeds
Variations of speed above and below the mean resisting torque line

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