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 the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, if N coincides with O, then

Acceleration of the piston P is zero and its velocity is maximum
Acceleration of the piston P is maximum and its velocity is zero
Acceleration and velocity of the piston P is zero
Acceleration and velocity of the piston P is maximum

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