Introduction To Mining Engineering - Study Mode
[#216] Permissible limit of respirable concentration of coal dust should not be more than
Correct Answer
(A) 2 mg/m 3
[#217] The effective position of box cut for a deposit, where ratio of OB : Ore is least should be
Correct Answer
(B) at the middle of the boundary
[#218] What should be the minimum insulation resistance of medium power cable?
Correct Answer
(B) 1 mega Ohm
[#219] Roof fall accidents can be minimized by
Correct Answer
(A) formulation of SSR and proper implementation of the support rule
[#220] Where the telephones or electrical signals are provided, the signal wires shall be supported on insulators and shall not be energized at more than
Correct Answer
(B) 30 V