81. Match the following for ore handling operations in an underground metal mine
Arrangement
Description
a. Draw point
1. arrangement that prevents oversized rock to pass
b. Ore pass
2. a system of vertical or near vertical openings for transferring ore from a stope to a single delivery point
c. Grizzly
3. a place where ore can be loaded and removed
d. Finger raise
4. a vertical or inclined opening used for transferring ore
| Arrangement | Description |
| a. Draw point | 1. arrangement that prevents oversized rock to pass |
| b. Ore pass | 2. a system of vertical or near vertical openings for transferring ore from a stope to a single delivery point |
| c. Grizzly | 3. a place where ore can be loaded and removed |
| d. Finger raise | 4. a vertical or inclined opening used for transferring ore |
82. Six detonators each having resistance of 1.5 ohm are connected in parallel. A 15 V exploder is connected to the detonators by two single-core cables of resistance 3 ohm each. The current in the circuit in Ampere is
83. What will be the overall slope of the benches shown in the figure?
84. In gassy mine being worked by soutirage method which of the following method of blasting is preferred?
85. The rotational speed and cutting velocity of a drill are 350 rpm and 71.50 m/min respectively. The diameter of the rotary drill bit in mm is
86. Rocks are 'massive' when bedding planes are more than "A"m apart. A is given by
87. 'Run away switch' is used in connection with
88. Which of the following credential is required for getting mining block in India?
89. An opencast mine has four benches. The height, width and face angle for each bench are 13 m, 30 m and 70° respectively. The overall slope angle of the benches in degrees is
90. Maximum permissible gradient for the haul road in opencast mines is
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