Drilling and Blasting MCQs Questions & Answers | Mining Engineering

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Section 1 Section 2 Section 3 Section 4 Section 5 Section 6 Section 7 Section 8 Section 9 Section 10

11.
The percentage of recovery in BG method is . . . . . . . .

A. 70-80%

B. 80-90%

C. 60-70%

D. 50-60%

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12.
Inflammability of coal dust increase almost . . . . . . . . proportional to the percentage of fire damp present in atmosphere.

A. inversely

B. directly

C. reversely

D. equally

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13.
What do you mean by mechanical efficiency of a fan.

A. The ratio of power in the air to the input power

B. The ratio of input head to Euler's head

C. The ratio of total head developed to velocity head

D. The ratio of the power actually absorbed by the impeller and converted into head to the power applied to the shaft

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14.
It involves the measurement of air velocity and quantity of air flowing in various parts of the mine called . . . . . . . .

A. Ventilation survey

B. Pressure survey

C. Quantity survey

D. Quality survey

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15.
A roadway driven in coal seam called . . . . . . . .

A. Dips

B. Drift

C. Gallery

D. Heading

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16.
Incubation period of coal is judged by . . . . . . . .

A. Experience

B. Method adopted

C. Time

D. None

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17.
Ammonium nitrate is comes under

A. Low explosive

B. High explosive

C. High strength

D. All of these

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18.
No drill shall be used for boring a shot hole unless it allows a clearance of at least "A" em over the diameter of the explosive cartridge. A is given

A. 0.5

B. 1

C. 2

D. 0.3

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19.
The minimum pillar to pillar distance of the depth of the seam is 150 m and gallery width is 3.6 m.

A. 16.5 m

B. 19.5 m

C. 25.5 m

D. 13.5 m

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20.
Meen air temperature of a 450 m deep down cast shaft is 29°C and that of the up cast shaft is 37°C, the height of the motion column m is . . . . . . . .

A. 8.2

B. 9.5

C. 11.6

D. 12.8

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Drilling and Blasting MCQs Questions & Answers | Mining Engineering

11. The percentage of recovery in BG method is . . . . . . . .

Answer & Solution

12. Inflammability of coal dust increase almost . . . . . . . . proportional to the percentage of fire damp present in atmosphere.

Answer & Solution

13. What do you mean by mechanical efficiency of a fan.

Answer & Solution

14. It involves the measurement of air velocity and quantity of air flowing in various parts of the mine called . . . . . . . .

Answer & Solution

15. A roadway driven in coal seam called . . . . . . . .

Answer & Solution

16. Incubation period of coal is judged by . . . . . . . .

Answer & Solution

17. Ammonium nitrate is comes under

Answer & Solution

18. No drill shall be used for boring a shot hole unless it allows a clearance of at least "A" em over the diameter of the explosive cartridge. A is given

Answer & Solution

19. The minimum pillar to pillar distance of the depth of the seam is 150 m and gallery width is 3.6 m.

Answer & Solution

20. Meen air temperature of a 450 m deep down cast shaft is 29°C and that of the up cast shaft is 37°C, the height of the motion column m is . . . . . . . .

Answer & Solution

Read More Section(Drilling and Blasting)

11.
The percentage of recovery in BG method is . . . . . . . .

12.
Inflammability of coal dust increase almost . . . . . . . . proportional to the percentage of fire damp present in atmosphere.

13.
What do you mean by mechanical efficiency of a fan.

14.
It involves the measurement of air velocity and quantity of air flowing in various parts of the mine called . . . . . . . .

15.
A roadway driven in coal seam called . . . . . . . .

16.
Incubation period of coal is judged by . . . . . . . .

17.
Ammonium nitrate is comes under

18.
No drill shall be used for boring a shot hole unless it allows a clearance of at least "A" em over the diameter of the explosive cartridge. A is given

19.
The minimum pillar to pillar distance of the depth of the seam is 150 m and gallery width is 3.6 m.

20.
Meen air temperature of a 450 m deep down cast shaft is 29°C and that of the up cast shaft is 37°C, the height of the motion column m is . . . . . . . .