Natural ventilation can be caused by
A. Auto-compression in downcast shaft
B. Differences in air densities in upcast and downcast shafts
C. auto-expansion in upcast shaft
D. moisture content in the mine
Answer: Option B
This Question Belongs to Mining Engineering >> Mine Environment
How the anemometer is used to determine the average velocity of air?
A. Anemometer should be moved throughout the cross section of the roadway
B. It is kept at the roof of the gallery
C. It is laid at the floor of the roadway
D. It is moved along a straight line
The important gaseous pollutants, contributing to acid rains, are
A. SO2 and NOx
B. CO2 and H2S
C. NOx and O3
D. None of the
The delay between the ignition and the application of the heat source termed as
A. lag on ignition
B. incubation period
C. saturation period
D. thermal conductivity
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