To prevent recirculation of air, the quantity of air taken by the auxiliary fan not exceed the quantity of air current from which the air passing through the fan is drawn.

Which of the following prime characteristic the nonel blasting has?

A. It has greater shock to the surrounding

B. It is noiseless in character

C. It has tremendous effect on explosive column

D. It can not be used in a place where there is a chance of stray current

The main purpose of self rescuer is to enable the wearer to escape through an atmosphere resulting after a . . . . . . . . or after an . . . . . . . . in a mine.

A. Fire, Explosion

B. Gas, Outburt

C. Rockburst, bump

D. None

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

A. Water pollution

B. Soil pollution

C. Air pollution

D. Noise pollution

A two phase system in which an inner or dispersed phase is distributed in an outer called

A. Emulsion

B. Slurry

C. Explosion

D. Erosion