Coal Mining - Study Mode
[#261] Over riding of pillars, premature collapse cover due to presence of
Correct Answer
(D) Strong thick massive sand stone
[#262] The core (dia in mm) size obtained with NX size
Correct Answer
(D) 54
[#263] Match the following: 1. Thickseam Extraction a. Double Unit Face 2. Bord and Pillar Extraction b. Jet Pearcing 3. Longwall Face Development c. Inclined Slicing 4. Hydraulic Mining d. Half Moon
Correct Answer
(A) 1-c, 2-d, 3-a, 4-b
[#264] The minimum distance between two sections should be if one working at floor and one at top.
Correct Answer
(D) 3m
[#265] Depillaring operations conducted from dip to . . . . . . . .
Correct Answer
(C) Rise