Mine Ventilation - Study Mode

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[#371] If CO 2 replaces air by . . . . . . . .% loss of consciousness causes to person.

(A) 3

(B) 6

(C) 10

(D) 15

Correct Answer

(D) 15

[#372] If the wet bulb temperature exceeds 30.5% at any place air current should be faster than . . . . . . . .

(A) 1.2 m/sec

(B) 1 m/sec

(C) 0.1 m/sec

(D) 2.5 m/sec

Correct Answer

(B) 1 m/sec

[#373] Acetylene lamp, burns when the oxygen percentage as low as . . . . . . . .

(A) 12 - 13

(B) 14 - 15

(C) 8 - 11

(D) 15 - 17

Correct Answer

(A) 12 - 13

[#374] Air flow from high pressure range to low pressure range. The difference of pressure caused by purely natural means called . . . . . . . .

(A) fan ventilation

(B) natural ventilation

(C) mechanical ventilation

(D) topographical ventialtion

Correct Answer

(B) natural ventilation

[#375] The generation of heat on the oxydation of CO to CO 2 has utilised by the detector . . . . . . . .

(A) PS detector

(B) hopacalite

(C) hoolamite

(D) multigas detector

Correct Answer

(B) hopacalite