Correct choice is (b) 4.0 – 4.2 m
For explanation: The diameter of the cylindroconical vessel is 4.0 – 4.2 m. The most common supplied cylindroconical fermentation vessel is of capacity 1500 hl with 12 – 13 m body height, a diameter of 4.0 – 4.2 m and cone with an included angle of 70°. This was reported by Shuttlewood in 1984.