Drilling And Blasting - Study Mode
[#551] Moderate seams the thickness of coal in between.
Correct Answer
(C) 1.5 - 4.5 m
[#552] The formula for finding the of air flow in m 3 /min.
Correct Answer
(A) Area × Velocity
[#553] The detonating pressure in blasting hole occurs.
Correct Answer
(C) Between shock front and CJ plane
[#554] The ignition temperature of anthracite coal is nearly . . . . . . . .°C.
Correct Answer
(C) 398
[#555] If the velocity of air in a settling chamber is 0.3 m/s terminal velocity of the particle is 0.19 m/s then find out h/l ratio of chamber assuming eddy factor 0.5.
Correct Answer
(A) 0.316