Mine Ventilation - Study Mode

Show All Answers

[#421] In still air flame of a flame safety lamp is extinguished at CO 2 percentage of . . . . . . . .

(A) 2 - 3

(B) 8 - 10

(C) 3 - 4

(D) 5 - 8

Correct Answer

(C) 3 - 4

[#422] Number of blades in a single inlet centrifugal fan.

(A) 32

(B) 128

(C) 64

(D) 96

Correct Answer

(C) 64

[#423] Identify the method for testing methane in mine are

(A) chemical analysis

(B) detectors

(C) flame safety lamps

(D) all of these

Correct Answer

(D) all of these

[#424] Internationally accepted value of standard atmospheric pressure in SI units is . . . . . . . . N/m 2 .

(A) 101325

(B) 150325

(C) 20000

(D) 121325

Correct Answer

(A) 101325

[#425] The percentage of oxygen present in mine atmospheric air by volume.

(A) 20.4

(B) 21.1

(C) 20.28

(D) 22.1

Correct Answer

(C) 20.28