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91
A longwall face cut by double back shuffle method can be only worked with
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Answer: Option C
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92
What is the relationship between break-even stripping ratio (BESR) and ordinary stripping ratio (OSR)?
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Answer: Option C
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93
Which of the following unique mining method is known as novel method?
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Answer: Option B
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94
Which of the following factor is considered for calculation of cycle time of excavating machine such as shovel, drag line etc?
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Answer: Option C
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95
Which of the following method is still followed in maximum number of underground coal mines in India
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Answer: Option D
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96
Which of the following method may be approaching obsolescence and proved to be the most expensive of all mining methods?
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Answer: Option A
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97
The mining method used in thick and steep coal seam, where the slices are neither horizontal nor parallel to the inclination of the seam, is called
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Answer: Option A
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98
Size of pillars is decided based on
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Answer: Option C
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99
Why different types of explosives are not normally charged in the same shot hole?
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Answer: Option B
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100
Which of the following method is known as vertical crater retreat, VCR (patented) method?
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Answer: Option C
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