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. The acceleration of the piston P with respect to the crank-pin C is given by

ω² × CN
ω² × NO
ω² × QN
ω² × CO

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Theory of Machine
In order to give a complete secondary balance of a multi-cylinder inline engine,

The algebraic sum of the secondary forces must be equal to zero
Both (A) and (B)
The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
None of these

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