Theory of Machine
The swaying couple is due to the

Two cylinders of locomotive
Partial balancing
Primary unbalanced force
Secondary unbalanced force

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Theory of Machine
The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead center, and n = Ratio of length of connecting rod to the radius of crank)

ω²r [cos θ + (cos 2θ/n)]
ωr [sin θ + (sin 2θ/n)]
ωr [cos θ + (cos 2θ/n)]
ω²r [sin θ + (sin 2θ/n)]

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Theory of Machine
The steering of a ship means

Movement of a complete ship up and down in vertical plane about transverse axis
Rolling of a complete ship sideways
None of these
Turning of a complete ship in a curve towards right or left, while it moves forward

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