Mine Ventilation - Practice Test

[#221] Specific gravity of H 2 S

(A) 1.2

(B) 0.967

(C) 1.75

(D) 1.52

Correct Answer

(C) 1.75

[#222] For a person working in an atmosphere containing 21% O 2 , the exhaled air contains 4.5% CO 2 and 16% O 2 . The respiratory quotient of breathing is

(A) 0.21

(B) 0.9

(C) 0.28

(D) 1.11

Correct Answer

(B) 0.9

[#223] An air sample taken from the return airway of a district contains the following gases. The Graham's ratio for the district is Gas CO 2 H 4 O 2 N 2 CO Concentration % 0.4 1.17 19.92 78.49 0.02

(A) 5.6

(B) 4.8

(C) 3.0

(D) 2.3

Correct Answer

(D) 2.3

[#224] In an underground working area, CH 4 and CO 2 are normally expected to be found respectively

(A) Near the floor and along the roadway

(B) Near the floor and near the roof

(C) Near the roof and near the floor

(D) Along the roadway and near the floor

Correct Answer

(C) Near the roof and near the floor

[#225] The centrifugal fan types are . . . . . . . .

(A) Radial blades

(B) Backward blades

(C) Forward blades

(D) None

(E) radial blades

(F) backward blades

(G) forward blades

(H) none

Correct Answer

(A) Radial blades
(E) radial blades

Mine Ventilation - Study Mode

[#221] Specific gravity of H 2 S

Correct Answer

[#222] For a person working in an atmosphere containing 21% O 2 , the exhaled air contains 4.5% CO 2 and 16% O 2 . The respiratory quotient of breathing is

Correct Answer

[#223] An air sample taken from the return airway of a district contains the following gases. The Graham's ratio for the district is Gas CO 2 H 4 O 2 N 2 CO Concentration % 0.4 1.17 19.92 78.49 0.02

Correct Answer

[#224] In an underground working area, CH 4 and CO 2 are normally expected to be found respectively

Correct Answer

[#225] The centrifugal fan types are . . . . . . . .

Correct Answer