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

Swaying couple
Hammer blow
None of these
Tractive force

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Theory of Machine
Pitch point on a cam is

The point on cam pitch curve having the maximum pressure angle
Any point on pitch circle
Any point on pitch curve
The point on cam pitch curve having the minimum pressure angle

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