Internal Combustion Engines
Scavenging air in diesel engine means

Burnt air containing products of combustion
Air used for forcing burnt gases out of engine's cylinder during the exhaust period
Air used for combustion sent under pressure
Forced air for cooling cylinder

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Internal Combustion Engines
The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in meters, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Dia. of brake drum in meters, and d = Dia. of rope in meters)

P = [(W - S) π (D + d) N]/60 watts
All of these
P = [(W - S) πDN]/60 watts
P = (Wl × 2πN)/60 watts

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