Opencast Mining - Study Mode

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[#286] Bench height - 12 m, burden - 4 m, spacing - 5 m, explosive per hole - 120 kg, density of rock - 2600 kg/m 2 is the power factor in tonne/kg is . . . . . . . .

(A) 2

(B) 4.6

(C) 5.2

(D) 7.3

Correct Answer

(C) 5.2

[#287] The ratio at which the cost of open cast mining equals that of under ground mining is

(A) Break even stripping ratio

(B) Limiting stripping ratio

(C) Quarriable limit

(D) Stripping ratio

Correct Answer

(A) Break even stripping ratio

[#288] In India coal seams with inclination as steep as . . . . . . . . have been worked by mechanical open cast.

(A) 1 in 2

(B) 1 in 3

(C) 1 in 4

(D) 1 in 5

Correct Answer

(B) 1 in 3

[#289] The maximum size of the boulder that can loaded by shovel is times the bucket capacity.

(A) 0.4

(B) 0.6

(C) 0.8

(D) 0.9

Correct Answer

(C) 0.8

[#290] The mining which is not completely effected by weather.

(A) Striping

(B) Quarrying

(C) Placer

(D) Underground mining

Correct Answer

(D) Underground mining