Drilling and Blasting MCQs Questions & Answers | Mining Engineering Page-2 section-2

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

11.
Spacing to burden ratio is normally kept at . . . . . . . .

A. 1.2

B. 1.5

C. 1

D. 2

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12.
In case of opencast working where any part of a public road or railway lies within the danger zone then there are some conditions imposed on charging or firing under current CMR 2017. Which of the following do not come under these conditions?

A. two persons are posted one each in either extreme points of such road, railway

B. they should have efficient telephonic communication system

C. they must have loud speakers or other means of intimating traffic

D. the charging or firing is not possible unless permission is obtained from PWD or Railway authority prior to such activity

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13.
A roadway in stone connecting two or more coal seams is called . . . . . . . .

A. Tunnel

B. Gallery

C. Drift

D. Throw

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14.
A flame proof enclosure is used for electrical apparatus at higher voltage exceeding . . . . . . . . volts.

A. 15

B. 20

C. 25

D. 30

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15.
A cylinder of oxygen is of 2.5 Iit capacity holding oxygen under a pressure of . . . . . . . . bars.

A. 100

B. 50

C. 250

D. 200

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16.
The increase in quantity of air due to expansion in the up cast shaft can be roughly taken as . . . . . . . .

A. 1% for every 15 m

B. 5% for every 100 m

C. 1% for every 100 m

D. 1% for every 50 m

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17.
Number of shelves in heavy weight barrier.

A. 6

B. 10

C. 16

D. 24

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18.
CO/O₂ deficiency ratio is . . . . . . . . normal to coal mine.

A. 0.1 to 0.5%

B. 0.5 - 0.8%

C. 0.8 to 1%

D. 0.0 - 0.3%

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19.
Quantity of air at the working face can be increased by introducing.

A. Regulator

B. Air crossing

C. Compressed air jets

D. Doors

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20.
When O₂ falls to 5% or less and methane rises to 30% N more behind the stopping, the samples collected at intervals of . . . . . . . .

A. 48 hours

B. 8 hours

C. 16 hours

D. 24 hours

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Drilling and Blasting MCQs Questions & Answers | Mining Engineering

11. Spacing to burden ratio is normally kept at . . . . . . . .

Answer & Solution

12. In case of opencast working where any part of a public road or railway lies within the danger zone then there are some conditions imposed on charging or firing under current CMR 2017. Which of the following do not come under these conditions?

Answer & Solution

13. A roadway in stone connecting two or more coal seams is called . . . . . . . .

Answer & Solution

14. A flame proof enclosure is used for electrical apparatus at higher voltage exceeding . . . . . . . . volts.

Answer & Solution

15. A cylinder of oxygen is of 2.5 Iit capacity holding oxygen under a pressure of . . . . . . . . bars.

Answer & Solution

16. The increase in quantity of air due to expansion in the up cast shaft can be roughly taken as . . . . . . . .

Answer & Solution

17. Number of shelves in heavy weight barrier.

Answer & Solution

18. CO/O2 deficiency ratio is . . . . . . . . normal to coal mine.

Answer & Solution

19. Quantity of air at the working face can be increased by introducing.

Answer & Solution

20. When O2 falls to 5% or less and methane rises to 30% N more behind the stopping, the samples collected at intervals of . . . . . . . .

Answer & Solution

Read More Section(Drilling and Blasting)

11.
Spacing to burden ratio is normally kept at . . . . . . . .

12.
In case of opencast working where any part of a public road or railway lies within the danger zone then there are some conditions imposed on charging or firing under current CMR 2017. Which of the following do not come under these conditions?

13.
A roadway in stone connecting two or more coal seams is called . . . . . . . .

14.
A flame proof enclosure is used for electrical apparatus at higher voltage exceeding . . . . . . . . volts.

15.
A cylinder of oxygen is of 2.5 Iit capacity holding oxygen under a pressure of . . . . . . . . bars.

16.
The increase in quantity of air due to expansion in the up cast shaft can be roughly taken as . . . . . . . .

17.
Number of shelves in heavy weight barrier.

18.
CO/O₂ deficiency ratio is . . . . . . . . normal to coal mine.

19.
Quantity of air at the working face can be increased by introducing.

20.
When O₂ falls to 5% or less and methane rises to 30% N more behind the stopping, the samples collected at intervals of . . . . . . . .