Introduction To Mining Engineering - Study Mode

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[#371] As per CEA 2010, the length of flexible cable used in portable and transportable apparatus shall not be more than

(A) 50m

(B) 100m

(C) 200m

(D) 300m

Correct Answer

(B) 100m

[#372] For what depth of coal seam from surface, the distance between centers of adjacent pillars shall not be less than 45 m for a gallery width of maximum 4.8 m?

(A) 60 - 90 m

(B) 90 - 150 m

(C) 150 - 240 m

(D) 240 - 340 m

Correct Answer

(D) 240 - 340 m

[#373] The flow rate of water in hydraulic mining for coal should be at least A gallon per minute. A is given by

(A) 50

(B) 100

(C) 150

(D) 300

Correct Answer

(D) 300

[#374] Dilution in sublevel caving is

(A) 10 - 35%

(B) > 40%

(C) < 10%

(D) < 5%

Correct Answer

(A) 10 - 35%

[#375] How much quantity of air should be conducted up to each face where solid blasting is practiced?

(A) 244 m 3 /min

(B) 264 m 3 /min

(C) 284 m 3 /min

(D) 400 m 3 /min

Correct Answer

(C) 284 m 3 /min