Drilling And Blasting - Study Mode
[#446] It is a good practice the air velocity not be exceed . . . . . . . . m/sec at the face.
Correct Answer
(D) 17
[#447] By installing an auxiliarly fan a forcing fan is used below ground for ventilation.
Correct Answer
(A) One or more faces forming a part of ventilating district
[#448] Which explosive fired by safety fuse.
Correct Answer
(D) Black powder
[#449] Level situated in between two main drives.
Correct Answer
(A) Intermediate level
[#450] The instrument which directly indicates the air velocity in m/sec. any point of observation.
Correct Answer
(D) Velometer