Question

The purpose of a) _____ is to remove the contaminated air and to introduce the

fresh air, to provide a sufficient quantity of air for b) _____.

In large mines natural ventilation is not sufficient, and the air current has to be

assisted by c) _____. This especially refers to coal mines and to mines where methane or

carbon dioxide penetrate into the workings and where much d) _____ is produced.

The function of the fun is to increase the flow of e) _____ through the mine airways

overcoming the resistance of the workings and inertia of the air. A mine ventilated in this

way must obviously have two openings, so that the air current may enter in one place, flow

through the mine and leave the mine by the second f) _____. Thus, mines with artificial

ventilation must have at least two shafts, one to act as a downcast, and the other as the

upcast.

срочно ​

Answer 1

The purpose of a) ventilation is to remove the contaminated air and to introduce the fresh air, to provide a sufficient quantity of air for b) **respiration**.

In large mines, natural ventilation is not sufficient, and the air current has to be assisted by c) fans. This especially refers to coal mines and to mines where methane or carbon dioxide penetrate into the workings and where much d) quantity is produced.

The function of the fan is to increase the flow of e) ventilation through the mine airways, overcoming the resistance of the workings and inertia of the air. A mine ventilated in this way must obviously have two openings, so that the air current may enter in one place, flow through the mine, and leave the mine by the second f) ventilation. Thus, mines with artificial ventilation must have at least two shafts, one to act as a downcast, and the other as the upcast.