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21
Which types of cables are used in portable & transportable apparatus?
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Answer: Option B
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22
Which of the below- mentioned coal subsidiary of Coal India Limited has no underground mine?
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Answer: Option C
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23
No winding rope, which has been in use for more than "A" years, shall be used for winding purpose. A is given by
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Answer: Option C
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24
For hydraulic transportation of solids in pipelines, the ratio of the size of solids to the pipe diameter should not be more than
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Answer: Option B
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25
Long wall mining method is best suitable for
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Answer: Option A
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26
Based on the manpower, what should be the quantity of air supposed to flow through the in bye most galleries?
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Answer: Option B
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27
The current average OMS in Indian underground coal mine with SB technology having SDL/LHD is
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Answer: Option A
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28
The process of underwater mining of sand, clay, tin and placer deposits of gold is known as
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Answer: Option B
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29
In sublevel stoping operation the draw system is generally
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Answer: Option A
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30
The full form of 'SSR' is
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Answer: Option D
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