Mining Methods - Mining Methods and Machinery - Mining Engineering Previous Year Questions

1

2007 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2007

The critical diameter of an explosive is defined as the diameter below which it

A

develops the optimum velocity of detonation

B

does not involve in chemical reaction

C

develops the maximum velocity of detonation

D

deflagrates

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2

2007 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2007

In opencast mining, the width which is extracted from the working bench is termed as

A

cut

B

bench width

C

bank width

D

bench face

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3

2007 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2007

A coal seam of 12 m thickness is worked out by mechanized top coal caving system. The thickness of the bottom slice is 3 m, length of the solid coal face is 120 m and the average depth of cut by the shearer (web) is 70 cm. The density of coal is 1300 kg/m3 with the percentage of extraction in the slice at 95 and in the top coal at 70. The production of coal per cycle in tonne is

A

1008

B

999

C

688

D

311

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4

2007 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2007

Four benches are being worked by the opencast mining system. Height, width and face angle for each bench are 15 m, 50 m and 70° respectively. The overall slope angle of the benches in degrees is

A

15.45

B

19.25

C

32.65

D

36.25

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5

2008 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2008

Q.6 In longwall caving, the thickness of immediate roof is calculated from

A

Bulking factor and width of longwall face

B

Seam thickness and width of longwall face

C

Seam thickness and bulking factor

D

Bulking factor and length of the panel

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6

2008 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2008

Q.8 Depending on the decreasing ability of surrounding rock to store strain energy, the underground metal mining methods can be ordered as

A

Cut-and-Fill stoping, Sublevel caving, Sublevel open stoping, Block caving

B

Sublevel open stoping, Cut-and-Fill stoping, Sublevel caving, Block caving

C

Sublevel caving, Sublevel open stoping, Cut-and-Fill stoping, Block caving

D

Block caving, Sublevel caving, Sublevel open stoping, Cut-and-Fill stoping

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7

2008 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2008

Q.9 If swell factor of ore in a shrinkage stope is 1.4, the output from the stope in percent of broken ore is

A

0

B

29

C

40

D

100

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8

2008 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2008

Q.11 In the order of the chronological development, the longwall support systems are arranged as
P     Powered support
Q     Link bar and friction support
R     Frame support
S     Hydraulic support

A

P>Q>R>S

B

R>S>Q>P

C

S>R>P>Q

D

Q>S>R>P

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9

2008 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2008

Given bench height: 12m, burden: 4m, spacing: 5m; sub-grade drilling: 2m; explosive per hole: 120 kg; density of rock: 2600 kg/m³, the powder factor in tonne/kg is

A

2.0

B

4.6

C

5.2

D

7.3

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10

2008 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2008

A shaft inset is as shown below. To transport a 15 m long object, the height 'H' of the inset in m should be

A

10.5

B

7.0

C

6.5

D

5.9

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11

2008 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2008

Match the following:

Blast Problem	Cause
P Misfire	1 Poor stemming
Q Vibration	2 Low current
R Blown-out shot	3 Excess charge
S Cut-off shot	4 Improper delays

A

P-3, Q-2, R-4, S-1

B

P-4, Q-1, R-2, S-3

C

P-2, Q-3, R-1, S-4

D

P-1, Q-2, R-4, S-3

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12

2008 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2008

Match the following:

Stoping method	Ore handling systems	Support system
P Breast stoping	1. LHD	a. In situ pillars
Q Cut and fill stoping	2. Scraper	b. Unsupported
R. Sublevel stoping	3. Gravity flow	c. Mill tailings

A

P-2-a, Q-1-c, R-3-b

B

P-1-a, Q-3-c, R-2-b

C

P-2-b, Q-1-a, R-3-c

D

P-1-c, Q-3-a, R-2-b

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13

2008 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2008

Match the following:

Mining method	Operation
P Bord and Pillar	1 Longhole radial drilling
Q Sublevel caving	2 Splitting and slicing
R Longwall retreating	3 Loosening under strata pressure
S Integrated Caving	4 Mechanical cutting

A

P-1, Q-4, R-3, S-2

B

P-2, Q-3, R-1, S-4

C

P-4, Q-2, R-3, S-1

D

P-2, Q-1, R-4, S-3

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14

2008 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2008

The wt % of solids in a sand-water stowing pipe is 60. If the solids density is 3000 kg/m³, the pulp density of the slurry in kg/m³ is

A

1380

B

1420

C

1560

D

1670

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15

2008 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2008

Match the following:

A

P-2, Q-1, R-3, S-4

B

P-4, Q-1, R-2, S-3

C

P-2, Q-4, R-3, S-1

D

P-1, Q-2, R-4, S-3

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16

2008 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2008

A surface mine blast pattern shown below has the following details:

Accessory	Resistance (in Ohms)	Number or Length
Detonator	2 per detonator	40 nos
Connecting wire	0.5/m	100 m
Bus wire	0.5/m	100 m
Firing line	0.01/m	200 m

If the exploder supplies 440 V, the current in the blasting circuit in ampere is

A

5.36

B

3.51

C

4.83

D

2.57

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17

2008 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2008

In a surface mine blast, the peak particle velocity (V in mm/s) is estimated from the equation V = 120(√SD)^{-1.6}, where SD is square root scaled distance. If at a distance of 100 m from the blast site the permissible peak particle velocity is 25 mm/s, the maximum charge per delay in kg is

A

404

B

414

C

434

D

464

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18

2009 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2009

Pocket and Wing technique of pillar extraction is relevant to

A

room and pillar method

B

bord and pillar method

C

Wongawilli method

D

shortwall method

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19

2009 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2009

Resuing stoping method is adopted when ore body is

A

flat and thick

B

very steep and thick

C

flat and thin

D

very steep and thin

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20

2009 · Mining Engineering · Mining Methods and Machinery · Mining Methods

Mining Engineering (MN) 2009

Match the following:

Seam characteristics	Coal mining method
P. 12 m thick flat seam	1. Mechanized longwall
Q. 7 m thick seam at 65° inclination	2. Descending shield
R. 3 m thick flat seam	3. Mechanized integral caving
S. 7 m thick seam at 25° inclination	4. Jankowiec

A

P-4, Q-3, R-2, S-1

B

P-3, Q-4, R-1, S-2

C

P-2, Q-3, R-4, S-1

D

P-3, Q-2, R-1, S-4

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