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

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Internal Combustion Engines
Fuel consumption of diesel engines is not guaranteed at one quarter load because at such low loads

The engine is rarely operated
The small difference in cooling water temperature or in internal friction has a disproportionate effect
The friction is unpredictable
The friction is high

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