31. The tapered props are used where the floor is . . . . . . . . and roof is . . . . . . . .
32. The roof above gallery height of . . . . . . . . m tested with bamboo shoded with iron.
33. Setting load should not be less than . . . . . . . . tonnes in a seam of moderate thickness above 1.2 m.
34. Shield has a sloping regid one piece roof of adjustable inclination on the goaf side, thus results elimination of side loading on . . . . . . . .
35. Yeilding props are classified into . . . . . . . . types.
36. Chock is errected in between four corner props are generally not necessary except
37. Which bar is strongest and offers more resistance to bending.
38. In Jharia coal field, the quality of coal . . . . . . . . with the depth.
39. The maximum gap between two chock shield support is
40. Safe limit of tensile strain in forest land is . . . . . . . . mm/m as per the guide lines of the Ministry of environment and forests.
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