31.
The limiting gredient of ordinary vehicle is . . . . . . . . from the horizontal.

32.
These things are employed, heavy earth moving machinery well hole drills etc for extraction of mineral.

33.
R.M.R stands for

34.
The type of drill bit employed in wagon drill machine.

38.
Cut off grade is

40.
The best principle for predicting of dump failure at the begining stage.