Mine Ventilation - Study Mode

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[#316] Match the following in the context of underground mine environment Instrument Measuring parameter P. Haldane apparatus I. Humidity Q. Godbert-Greenwald apparatus II. Air velocity R. Hygrometer III. Mine air composition S. Anemometer IV. Ignition point temperature

(A) P-II, Q-I, R-III, S-IV

(B) P-III, Q-IV, R-I, S-II

(C) P-IV, Q-II, R-III, S-I

(D) P-I, Q-III, R-IV, S-II

Correct Answer

(B) P-III, Q-IV, R-I, S-II

[#317] In an underground coal mine area the graham's ratio found 3% is the indication of

(A) Existence of spontaneous heating

(B) Active fire

(C) Heating in advanced stage

(D) Normal to the coal mine

Correct Answer

(B) Active fire

[#318] A man exhales 0.002 m 3 of CO 2 per min when working in a confined space in underground. Assuming that the fresh air contains 0.03% CO 2 , the minimum quantity of fresh air to be supplied per person in m 3 /min, so that concentration of CO 2 , in air never crosses 0.4%, will be

(A) 0.5 ∗ 10 -3

(B) 5.4 ∗ 10 -3

(C) 540 ∗ 10 -3

(D) 66 ∗ 10 -3

Correct Answer

(C) 540 ∗ 10 -3

[#319] The thermometer bulb covered with moist cloth called as

(A) Dry bulb

(B) Kata bulb

(C) Wet bulb

(D) None

Correct Answer

(C) Wet bulb

[#320] In a mine ventilation system, the resistances of two splits A and B are 0.5 Ns 2 m -8 and 2 Ns 2 m -8 respectively. Combined resistance of two shafts and trunk airways is 0.7 Ns 2 m -8 . A quantity of 20 m 3 /s of air passes through split A. The total air power of the ventilation system in kW are

(A) 82.9

(B) 48.9

(C) 24.9

(D) 27.9

Correct Answer

(C) 24.9