Coal Mining MCQs Questions & Answers | Mining Engineering Page-6 section-1

51.
The core (dia in mm) size obtained with NX size

A. 21

B. 28

C. 40

D. 54

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52.
Match the following:

1. Thickseam Extraction a. Double Unit Face

2. Bord and Pillar Extraction b. Jet Pearcing

3. Longwall Face Development c. Inclined Slicing

4. Hydraulic Mining d. Half Moon

A. 1-c, 2-d, 3-a, 4-b

B. 1-c, 2-b, 3-c, 4-d

C. 1-b, 2-a, 3-d, 4-c

D. 1-d, 2-c, 3-a, 4-b

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53.
The minimum distance between two sections should be if one working at floor and one at top.

A. 4m

B. 6m

C. 5m

D. 3m

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54.
Depillaring operations conducted from dip to . . . . . . . .

A. Strike

B. Dip

C. Rise

D. Cross cut

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55.
Room and pillar mining employed at depth below . . . . . . . . meters.

A. 100

B. 200

C. 300

D. 400

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56.
The core sizes whose wire line drilling technique is adopted are for BX holes

A. 25mm

B. 35mm

C. 44mm

D. 54mm

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57.
Barrier in between panels is preferably puncture at 'A' number of places. 'A' is given by

A. 4

B. 3

C. 2

D. 1

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58.
Dewatering can be done by using the drill machines like

A. Jack hammer

B. Pneumatic drill

C. Volsafe drill

D. Wagon drill

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59.
Rock formed by errosion, weathering, transportation and ultimately deposition of pre-existing rock

A. Igneous rocks

B. Metamorphic rocks

C. Metamorphic

D. None

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60.
Maximum roof exposure for caving is

A. 60 - 90m²

B. 20 - 40m²

C. 40 - 60m²

D. 100 - 120m²

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1. Thickseam Extraction	a. Double Unit Face
2. Bord and Pillar Extraction	b. Jet Pearcing
3. Longwall Face Development	c. Inclined Slicing
4. Hydraulic Mining	d. Half Moon

Coal Mining MCQs Questions & Answers | Mining Engineering

51. The core (dia in mm) size obtained with NX size

Answer & Solution

52. Match the following: 1. Thickseam Extraction a. Double Unit Face 2. Bord and Pillar Extraction b. Jet Pearcing 3. Longwall Face Development c. Inclined Slicing 4. Hydraulic Mining d. Half Moon

Answer & Solution

53. The minimum distance between two sections should be if one working at floor and one at top.

Answer & Solution

54. Depillaring operations conducted from dip to . . . . . . . .

Answer & Solution

55. Room and pillar mining employed at depth below . . . . . . . . meters.

Answer & Solution

56. The core sizes whose wire line drilling technique is adopted are for BX holes

Answer & Solution

57. Barrier in between panels is preferably puncture at 'A' number of places. 'A' is given by

Answer & Solution

58. Dewatering can be done by using the drill machines like

Answer & Solution

59. Rock formed by errosion, weathering, transportation and ultimately deposition of pre-existing rock

Answer & Solution

60. Maximum roof exposure for caving is

Answer & Solution

51.
The core (dia in mm) size obtained with NX size

52.
Match the following:

1. Thickseam Extraction a. Double Unit Face

2. Bord and Pillar Extraction b. Jet Pearcing

3. Longwall Face Development c. Inclined Slicing

4. Hydraulic Mining d. Half Moon

53.
The minimum distance between two sections should be if one working at floor and one at top.

54.
Depillaring operations conducted from dip to . . . . . . . .

55.
Room and pillar mining employed at depth below . . . . . . . . meters.

56.
The core sizes whose wire line drilling technique is adopted are for BX holes

57.
Barrier in between panels is preferably puncture at 'A' number of places. 'A' is given by

58.
Dewatering can be done by using the drill machines like

59.
Rock formed by errosion, weathering, transportation and ultimately deposition of pre-existing rock

60.
Maximum roof exposure for caving is