Surface Environment - Surface Environment, Mine Ventilation and Underground Hazards - Mining Engineering Previous Year Questions

In the Gaussian plume model, the dispersion coefficients are function of

An effluent sample is diluted with fresh water to make up a solution of 300 ml. The DO of the solution initially is 8.0 mg/l and the value falls to 3.0 mg/l after 5 days. If the 5-day BOD of the original effluent is known to be 50 mg/l, the amount of fresh water added in ml to the solution is

With respect to stack emission the phenomenon of fumigation is noticed in case of

A jackhammer operates at a corner of a square field of side 50 m. At the diagonally opposite corner, the SPL sensed is 82.3 dB. The SPL at any of the other two corners of the field in dB is

Precipitation of metallic ions in mine water drainage is carried out by

Total number of injuries in an opencast coal mine employing 800 persons is 16 in a year. As per DGMS norms, the injury rate per 1000 persons employed is

The saturated value of the dissolved oxygen in the mixture is given to be 9.3mg/l. On this basis, the initial oxygen deficit of the mixture in mg/l is

An air quality parameter required to be monitored under the Indian National Ambient Air Quality Standards is

In a surface mine, sound pressure level at a location generated by operation of a dozer and a drill respectively are 80 dBA and 60 dBA, when operated independently. The sound pressure generated by the dozer compared to the drill is higher by a factor of

Cyclone, bag filter and scrubber can be used for control of

A mine waste dump of pH 5.2 can be neutralized by adding