Opencast Mining MCQs Questions & Answers | Mining Engineering Page-4 section-1

31.
The limiting gredient of ordinary vehicle is . . . . . . . . from the horizontal.

A. 1 in 6

B. 1 in 5

C. 1 in 10

D. 1 in 15

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32.
These things are employed, heavy earth moving machinery well hole drills etc for extraction of mineral.

A. Manual mining

B. Mechanised open cast

C. Horizon

D. Slicing

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33.
R.M.R stands for

A. Rate of Marginal Return

B. Rockmass rating

C. Rating of Massive Roof

D. Rated mass of Rock

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34.
The type of drill bit employed in wagon drill machine.

A. Auger bit

B. Eccentri bit

C. X' bit with tungsten carbide

D. Worm bit

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35.
Scrapers are unsuitable in soils with . . . . . . . .

A. Stumps

B. Large boulders

C. Hard rocks

D. All

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36.
The effective position of box cut for a deposit whose OB ratio: ore is least should be

A. At boundary of mineral

B. At the middle of boundary

C. At high seam slope

D. At any place

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37.
Air consumption by down the hole hammer drills at . . . . . . . .

A. 7 kgf/cm² is 5.5m³/min

B. 9 kgf/cm² is 6.5m³/min

C. 10 kgf/cm² is 8.5m³/min

D. 6 kgf/cm² is 4m³/min

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38.
Cut off grade is

A. The grade of ore ultimately fed to the benefication plant

B. Always the same average grade

C. The grade of ore through net the ore body

D. The grade of ore below which mining is uneconomical

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39.
The conditions suitable for internal dump are

A. Horizontal deposits

B. Thick and moderately dipping deposits

C. Steeply dipping deposits

D. None

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40.
The best principle for predicting of dump failure at the begining stage.

A. Initiation of cracks on sides

B. Rate of displacement point under consideration

C. Development of depression on top

D. Changes in geometric shape and size of dump

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Opencast Mining MCQs Questions & Answers | Mining Engineering

31. The limiting gredient of ordinary vehicle is . . . . . . . . from the horizontal.

Answer & Solution

32. These things are employed, heavy earth moving machinery well hole drills etc for extraction of mineral.

Answer & Solution

33. R.M.R stands for

Answer & Solution

34. The type of drill bit employed in wagon drill machine.

Answer & Solution

35. Scrapers are unsuitable in soils with . . . . . . . .

Answer & Solution

36. The effective position of box cut for a deposit whose OB ratio: ore is least should be

Answer & Solution

37. Air consumption by down the hole hammer drills at . . . . . . . .

Answer & Solution

38. Cut off grade is

Answer & Solution

39. The conditions suitable for internal dump are

Answer & Solution

40. The best principle for predicting of dump failure at the begining stage.

Answer & Solution

31.
The limiting gredient of ordinary vehicle is . . . . . . . . from the horizontal.

32.
These things are employed, heavy earth moving machinery well hole drills etc for extraction of mineral.

33.
R.M.R stands for

34.
The type of drill bit employed in wagon drill machine.

35.
Scrapers are unsuitable in soils with . . . . . . . .

36.
The effective position of box cut for a deposit whose OB ratio: ore is least should be

37.
Air consumption by down the hole hammer drills at . . . . . . . .

38.
Cut off grade is

39.
The conditions suitable for internal dump are

40.
The best principle for predicting of dump failure at the begining stage.