Drilling And Blasting - Study Mode
[#521] The increase in the quantity of air due to expansion in the up cast shaft can be roughly taken as . . . . . . . .% for every 100 m depth.
Correct Answer
(C) 1%
[#522] Main purpose of development is . . . . . . . .
Correct Answer
Prospect ore body from underground for more details
[#523] The type of fan employed to improve the quantity of air in one or more districts having high resistance without increasing the total quantity of air ciculated by the main surface fan
Correct Answer
(C) Booster fan
[#524] In which drivage needs skill men to drive it.
Correct Answer
(B) Shaft
[#525] Maximum velocities of ventilating air at conveyor roads, loading points and transfer points.
Correct Answer
(A) 4 m/sec