61. What should be the speed of air current when the wet bulb temperature exceeds 30.5°C?
62. A sample of 144 items gives a mean value of 45, with a standard deviation of 3. Calculate symmetric confidence limits within which the true population lies with 95% confidence?
63. One of the important safety feature of cap lamp is
64. The term 'Lay' in wire rope is used to denote
65. Quick production can be achieved from
66. The excess pore pressure in backfill material in a cut and fill stope leads to
67. In connection with man winding, the approximate floor area per person in a cage shall be
68. Pocket and wing technique of pillar extraction is relevant to
69. Who out of the following is not an official but a competent person?
70. In-situ ore of 1.5% Cu got diluted with waste rock of value 0.2% Cu. If the resultant extracted ore has 1.2% Cu. What is the percentage of dilution?
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