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11
Which of the following support has maximum linear progress?
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Answer: Option C
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12
Every ladder way used in a mine shall project above the mouth of at least
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Answer: Option A
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13
Which of the following is most difficult in opening up an opencast mine?
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Answer: Option A
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14
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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Answer: Option A
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15
Top slicing is an underhand caving method which is a variation of
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Answer: Option C
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16
The diameter of holes in mm commonly used for ring drilling by drifters in sublevel stoping is between
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Answer: Option D
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17
Friction Clutch is used for
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Answer: Option B
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18
The process that sends sand water mixture in underground coal depillaring district is known as
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Answer: Option C
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19
Which of the following method of mining is only applicable to non-coal mines?
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Answer: Option B
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20
As per CEA 2010, the length of flexible cable used in portable and transportable apparatus shall not be more than
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Answer: Option B
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