Theory of Machine
In a locomotive, the resultant unbalanced force due to the two cylinders along the line of stroke, is known as

Tractive force
Swaying couple
Hammer blow
None of these

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Theory of Machine
In a single slider crank chain

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

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