The following results refer to a test on C.I. Engine:

Indicated power \(=37 \mathrm{~kW}\);

Frictional power \(=6 \mathrm{~kW}\);

Brake specific fuel consumption \(=0.28 \mathrm{~kg} / \mathrm{KWh}\); Calorific value of fuel \(=44,300 \mathrm{~kJ} / \mathrm{kg}\)

Calculate: (i) mechanical efficiency, (ii) brake thermal efficiency, and (iii) indicated thermal efficiency.