The brake power (B.P.) of the engine is given by (where W = Brake load or dead l

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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)

Options:

A . B.P = (Wl × 2πN)/60 watts

B . B.P = [(W - S) πDN]/60 watts

C . B.P = [(W - S) π (D + d) N]/60 watts

D . All of these

Answer: Option D

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