Mine Ventilation MCQs Questions & Answers | Mining Engineering

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31.
The formulae for finding density of air in kg/m³.

A. $$\frac{{0.4645B}}{{273 + t}}$$

B. $$\frac{{0.4645B}}{{273 + {t_u} + {t_d}}}$$

C. $$\frac{{{t_u} + {t_d}}}{{0.4645D}}$$

D. $$\frac{{{P_1}{V_1}}}{{{T_1}}} - \frac{{0.4645B}}{{273 + t}}$$

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32.
At what percentage of CO₂, safety lamp begins to die down.

A. 1.0

B. 0.5

C. 0.1

D. 3

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33.
Nitrogen used for quenching . . . . . . . .

A. gas

B. explosives

C. fires

D. innudation

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34.
The fluid commonly used in 'U' tube manometer if more pressure difference.

A. alchohol

B. water

C. lighter liquid

D. mercury

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35.
Homalite is a mixture of

A. iodine pentoxide and sulphuric acid

B. codine pentoxide and sulphate of pelladium

C. sulphuric acid and maganese dioxide

D. copper oxide and pentoxide

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36.
Flame safety lamp is also known as

A. DGMS safety lamp

B. Electric safety lamp

C. Davy safety lamp

D. Mark's safety lamp

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37.
The percentage of O₂ percent in atmospheric air by volume.

A. 20.93

B. 23.15

C. 20.79

D. 23.19

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38.
Basing on shape of the blade the centrifugal fans classified into . . . . . . . . types.

A. 2

B. 4

C. 3

D. 5

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39.
Arrange and write the following parts of flame safety lamp from bottom to top

A. oil velsel

B. outer glass

C. wick holder wick retain

D. magnetic lock

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40.
The difference in densities between two shafts may be produced by the following factors are

A. unequal depth of shafts

B. presence of fire in one of shaft

C. presence of fire damp

D. movement of cage in shaft

E. all these

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Mine Ventilation MCQs Questions & Answers | Mining Engineering

31. The formulae for finding density of air in kg/m3.

Answer & Solution

32. At what percentage of CO2, safety lamp begins to die down.

Answer & Solution

33. Nitrogen used for quenching . . . . . . . .

Answer & Solution

34. The fluid commonly used in 'U' tube manometer if more pressure difference.

Answer & Solution

35. Homalite is a mixture of

Answer & Solution

36. Flame safety lamp is also known as

Answer & Solution

37. The percentage of O2 percent in atmospheric air by volume.

Answer & Solution

38. Basing on shape of the blade the centrifugal fans classified into . . . . . . . . types.

Answer & Solution

39. Arrange and write the following parts of flame safety lamp from bottom to top

Answer & Solution

40. The difference in densities between two shafts may be produced by the following factors are

Answer & Solution

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31.
The formulae for finding density of air in kg/m³.

32.
At what percentage of CO₂, safety lamp begins to die down.

33.
Nitrogen used for quenching . . . . . . . .

34.
The fluid commonly used in 'U' tube manometer if more pressure difference.

35.
Homalite is a mixture of

36.
Flame safety lamp is also known as

37.
The percentage of O₂ percent in atmospheric air by volume.

38.
Basing on shape of the blade the centrifugal fans classified into . . . . . . . . types.

39.
Arrange and write the following parts of flame safety lamp from bottom to top

40.
The difference in densities between two shafts may be produced by the following factors are