Five sound level measurements were made near a Diesel-Generator. The measurements were made at a height of 1.4 metres above the floor and at a distance of 1 metre from the operating engine. The following levels were measured at five locations:1) 100.0 dB; 2) 95.7 dB; 3) 102.1 dB; 4) 99.1 dB; 5) 98.0 dB. The equivalent radius of the measurements was 3.83 metres (the radius of the hemisphere that has the same surface area as the actual measurement surface defined by the microphone positions) where Lw = Lp + 10log2req 2 dB. Determine: a) the theoretical sound power of the engine; b) the directivity index of the engine for the five measuring locations