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Question

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 metres, N = Speed of engine in r.p.m., S - Spring balance reading in newtons, D = Dia. of brake drum in metres, and d = Dia. of rope in metres)


Options:
A .  `B.P. = (W.l xx 2 pi N)/(60) ` watts
B .  `B.P. = ((W - S) pi D N)/(60)` watts
C .  `B.P. = ((W - S) pi (D +d )N)/(60)` watts
D .  all of these
Answer: Option D



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