61. Platinum deposits are
62. The percentage of emulsion oil used in hydraulic prop.
63. In Indian conditions the angle of draw is always
64. When props and bars are used for supporting the long wall face. In Indian mines, which type of system is used for longwall face.
65. . . . . . . . . axis represents the behavior of the prop under load.
66. Lignite deposite is found in . . . . . . . .
67. A timber prop is expected to support a roof area of about . . . . . . . . all around.
68. Which type of prop is lighter in weight in yeilding props.
69. Generally the yeild of the prop plotted in
70. Relative volume of all props contained in unit volume of rock is measure of its
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