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A single cylinder, four stroke cycle oil engine is fitted with a rope brake. The diameter of the brake wheel is 600 mm and the rope diameter is 26 mm. The dead load on the brake is 200 N and the spring balance reads 30 N. If the engine runs at 450 r.p.m., what will be the brake power of the engine?

A single cylinder, four stroke cycle oil engine is fitted with a rope brake. The diameter of the brake wheel is 600 mm and the rope diameter is 26 mm. The dead load on the brake is 200 N and the spring balance reads 30 N. If the engine runs at 450 r.p.m., what will be the brake power of the engine? Correct Answer 2.5 kW

Diameter of the brake wheel, Db = 600 mm = 0.6 m Rope diameter, d = 26 mm = 0.026 m Dead load on the brake, W = 200 N Spring balance reading, S = 30 N Engine speed, N = 450 r.p.m. Brake Power, B.P. = ((W – S)pi(Db + d)N)/60 x 1000 = ((200 – 30)pi(0.6 + 0.026) x 450)/60 x 1000 = 2.5 kW.

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