10 lux

15 lux

20 lux

30 lux

single side lighting

staggered system

central lighting system

none of the above

diverging to the right side and merging from left

diverging to the left side and merging from right

diverging to the right side and merging from right

diverging to the left side and merging from left

compressibility and permeability decrease and dry strength increases

compressibility, permeability and dry strength decrease

compressibility, permeability and dry strength increase

compressibility and permeability increase and dry strength decreases

crushing strength test

abrasion test

impact test

shape test