Automobile Engineering in ME
The indicated power of a four stroke engine (in watts) is equal to (where P = Mean effective pressure in N/m², L = Length of stroke in metres, A = Cross-sectional area of the piston in m², and N = Speed of the engine in revolutions per second (r.p.s)

2 × P.L.A.N
P.L.A.N
P.L.A.N/4
P.L.A.N/2

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Automobile Engineering in ME
The rigid suspension is beneficial when

It is desired to improve tyre to ground contact characteristics
Large changes in load make it necessary to have a large suspension stroke
It is desired to have more flexibility in design
It is desired to reduce the unsprung mass

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