51. Crack formed under tensile stress and shear stress called
52. The maximum stress of metals can withstand without breaking or without failure for specific number of stress reveals.
53. The yeilding props which exerts resistance with continuous increase in yeild called
54. The minimum length of sleeper used as chock support if the roof height of 3 m to be supported
55. The chock is tightend against the roof by hammering . . . . . . . .
56. Stress is
57. Plate shows a triaxial test cell for specimens upto . . . . . . . . diameter.
58. Normal load, in hydraulic prop.
59. In pressure arch theory, lateral forces, intensity of which increases with . . . . . . . .
60. Rejects are coals whose ash + moisture is in excess of
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