Mine Ventilation - Study Mode

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[#86] The formula for finding the velocity of air . . . . . . . .

(A) $$4.015sqrt {wg} $$

(B) $$3sqrt {wg} $$

(C) $$4.8sqrt {wg} $$

(D) $$6sqrt {wg} $$

Correct Answer

(A) $$4.015sqrt {wg} $$

[#87] Match the following: Mine gas Principal constituent P. Stink damp 1. CO Q. White damp 2. H 2 S R. Black damp 3. CH 4 S. Fire damp 4. CO 2

(A) P-1, Q-2, R-3, S-4

(B) P-3, Q-4, R-1, S-2

(C) P-2, Q-1, R-4, S-3

(D) P-2, Q-1, R-3, S-4

Correct Answer

(C) P-2, Q-1, R-4, S-3

[#88] The lower and upper limit of methane - air explosive mixture is

(A) 0.75%, 1.25%

(B) 5.4%, 14.8%

(C) 5.0%, 15.0%

(D) 5.9%, 12.5%

Correct Answer

(B) 5.4%, 14.8%

[#89] The sp.gr of CO 2

(A) 1.2

(B) 1.52

(C) 0.553

(D) 0.967

Correct Answer

(B) 1.52

[#90] In a mine between upcast shaft and downcast shaft, two airways are connected in parallel and their resistances are 100 and 120 Ns -2 m -8 respectively. The resistance of upcast shaft, downcast shaft and the fan drifts are 10, 20, and 5 Ns -2 m -8 respectively. The rate of airflow through the split airway having resistance of 100 Ns -2 m -8 in m 3 /s is

(A) 0.42

(B) 0.79

(C) 2.19

(D) 7.90

Correct Answer

0.42