The brake power is the power available

The brake power is the power available Correct Answer At the crank shaft

The brake power is the power available at the crank shaft.
The brake power (briefly written as B.P.) of an I.C. Engine is the power available at the crankshaft.
The brake power of an I.C. engine is, usually, measured by means of a brake mechanism (prony brake or rope brake).

Related Questions

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 = Diameter of brake drum in meters and d = Diameter of rope in meters)
For which of the following engines a prony brake is used to measure brake power?