Mine Ventilation - Study Mode

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[#271] The percentage of CO 2 present in atmospheric air by volume.

(A) 0.03

(B) 0.046

(C) 0.047

(D) 0.05

Correct Answer

(A) 0.03

[#272] Inclined manometers, used to measure very small differences of pressure upto . . . . . . . . mm of water.

(A) 25

(B) 30

(C) 40

(D) 50

Correct Answer

(D) 50

[#273] Inhalation of pure O 2 under normal pressure of upto . . . . . . . . hours no harmful effect.

(A) 2

(B) 4

(C) 6

(D) 8

Correct Answer

(C) 6

[#274] In a controlled recirculation system, there can not be provision to supress.

(A) heat

(B) dust

(C) humidity

(D) inflammable gas

Correct Answer

(D) inflammable gas

[#275] The silver coin turns black in the present of . . . . . . . . gas.

(A) H 2

(B) CH 4

(C) CO 2

(D) H 2 S

Correct Answer

(D) H 2 S