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

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Automobile Engineering in ME
The basic purpose of a four wheel drive (4WD) system is that it

Delivers improved cornering on dry road surfaces
Ensures that effective braking can be performed, even on slippery surfaces
Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
Eliminates the need of snow tyres, tyre chains, etc.

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