245) Minimum depth of ballast cushion for a Broad Gauge wooden sleeper of size 275x25x13 cm with 75 cm sleeper spacing is

246) Sleeper density in India is normally kept as [where M is the rail length in meters.]

247) For a Broad Gauge route with M+7 sleeper density, number of sleepers per rail length is

248) Standard size of wooden sleeper for Broad Gauge track is

249) Composite sleeper index is the index of