21,Controlling the coarse of a borehole so as to follow predetermined path is ...?,
Deviation of borehole,
wireline drilling,
control drilling,
directional drilling,
22,The starting point of shaft at the ground surface is called..?,
collar,
pithead,
platform,
scaffold,
23,Ventilation by mechanical means is provided in sinking shaft exceeding depth of...m?,
30,
25,
40,
15,
24,The device used to prevent undue swinging of the bucket in sinking shaft?,
spider,
kibble,
scaffold,
rider,
25,The safety device is provided in sinking shaft in case of overwind?,
spider,
kibble,
detaching hook,
rider,1
Ans: 4,1,2,4,1
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