56,The % of extraction if the depth of seam is 200m and gallery width is 4.8m?,
33,25,20,40,
57,The max length of the trailing cable is .....m?,
50,90,150,200,
58,Capacity of slusher is ..tph?,
30-40,40-60,10-20,70-100,
59,A landing or platform in a shaft including an excavation between top and bottom of the shaft is called?,
midsetlanding,inset,collar,cover,
60,The process of conversion of chemical energy into heat and mechanical energy is called...?,
oxidation,combustion,detonation,none of the above,
Ans: 2,2,1,2,1
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