MINING ENGINEERING

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HERE THE QUESTIONS FOR YOU MINING ENGINEERS   (Q1  to Q10) AND 

(ANSWERS ARE BELOW THE QUESTIONS)  

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Q1) 


The method suitable for workings seam under the surface containing valuable property water bodies for whose protection some coal is left unworked is ?

1)  Longwall retreat

2)  Bord and pillar

3)  Hydraulic mining

4)  Longwall advancing 


 
Q2)


The width of the headings in bord and pillar method of working depends on?

1)  depth of working

2)  size of the pillars

3)  face machinary used

4)  ventilation required



Q3)


With strong roof and unyielding floor tends to?

1)  Crush the roof

2)  Heave the floor

3)  Crush the sides of pillars

4)  Spontaneous heating


Q4)


The shape of the pillar that gives maximum percentage of recovery with speed reduced amount of lift for loading is?

1)  square

2)  rectangle

3)  rhombus

4)  circular 


Q5)


The shape of the pillar in steep seams for haulage and loading and in flat and inclined seam for adoption of high capacity machinery like shuttle cars and locomotive is ?

1)  square

2)  rectangle

3)  rhombus

4)  circular



Q6)


For given perimeter the greatest area of support is offered by ?

1)  square

2)  rectangle

3)  rhombus

4)  circular



Q7)


In deciding the size of the panel the important factor to be considered is?

1)  thickness of the seam

2)  output required

3)  depth of the seam

4)  incubation period 


Q8)


The number of panels to be opened at a time is decided by ?

1)  Capacity of the direct rope haulage

2)  Output desired

3)  Thickness of the seam

4)  Incubation period


Q9) 


In a seam with locomotive haulage system the junctions with main headings are staggered ?

1)  For easy travelling of loco

2)  to minimize roof exposure

3)  to reduce ventilation air loss

4)  none of the above


Q10)


Heavy roof fall and even premature collapse may taken place if line of goaf is?

1)  parallel to strike

2)  diagonal

3)  right angle to fault

4)  parallel to fault



ANSWERS FOR ABOVE QUESTIONS 



Q1)  2         Q2)  3        Q3)  3         Q4)   2        Q5)     3


Q6)  1        Q7)  4        Q8)  1         Q9)   2        Q10)    4 










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MINING ENGINEERING

WELCOME TO  MINING ENGINEERING 

HERE THE QUESTIONS FOR YOU MINING ENGINEERS   (Q1  to Q10) AND 

(ANSWERS ARE BELOW THE QUESTIONS)  

CLICK ON THE LINK  TO JOIN WhatsApp (GROUP) 

 https://chat.whatsapp.com/CQMdLDTRYlpJ4SvTdlctqy   ( OR) 










Q1) 


Main fall occurs When the area of extraction is nearly equal or more than the .....of the depth?


1)  twice

2)  thrice

3)  square

4)  cube 

 
Q2)


Upto what gradient the Bord and pillar mining can be adopted withour special arrangements?


1)  1 in 3

2)  1 in 4

3)  1 in 5

4)  1 in 6


Q3)


If the pillars are not strong they may be crushed due to sudden pressure is called?


1)  premature collapse

2)  normal collapse

3)  local fall

4)  overriding of pillars


Q4)


In which line of extraction one solid stook intervenes between two stooks under extraction at a time?

1)  Diagonal

2)  Step diagonal

3)  parallel to strike

4)  Arrow head 

Q5)


In which line of extraction the pillar or stook is under excessive pressure and is liable to crush?

1)  Diagonal

2)  Step diagonal

3)  parallel to strike

4)  Arrow head


Q6)


If the depillaring is proceeding from dip to rise and seam inclination is not mild so that goaf can be submerged in water then the line of goaf is?

1)  Diagonal

2)  Step diagonal

3)  parallel to strike

4)  Arrow head


Q7)


In shallow seams to prevent breathing of air to the depillared area through cracks to the surface the cracks have to be blanketed with a minimum thickness of layer of sand or earth nearly?

1)  1m

2)  1.2m

3)  1.5m

4)  2m 


Q8)


The sudden release of elastic strain energy stored in the pillars results violent burst of coal pillars is called?

1)  Air blast

2)  Bumps

3)  Rock burst

4)  Main fall


Q9) 


Headings advancing in a direction at right angels to the main cleat are called?


1)  bords

2)  end places

3)  walls

4)  splits


Q10)


The method suitable for working seam under the workings of another seam which is water logged or on fire is?


1)  Longwall retreat

2)  Bord and pillar

3)  Hydraulic mining

4)  Longwall advancing


ANSWERS FOR ABOVE QUESTIONS 



Q1)  3        Q2)  2        Q3)  4         Q4)   2        Q5)     4


Q6)  3        Q7)  2        Q8)  2         Q9)   1        Q10)    2 









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Labels:

MINING ENGINEERING

WELCOME TO  MINING ENGINEERING 

HERE THE QUESTIONS FOR YOU MINING ENGINEERS   (Q1  to Q10) AND 

(ANSWERS ARE BELOW THE QUESTIONS)  

CLICK ON THE LINK  TO JOIN WhatsApp (GROUP) 

 https://chat.whatsapp.com/CQMdLDTRYlpJ4SvTdlctqy   ( OR) 










Q1) 


Working coal in the pillars formed in the operation in bord and pillar mining is ?


1)  Working in the broken

2)  Working in the whole

3)  Longwall retreat

4)  Slicing
 
Q2)


The galleries driven through the pillar for forming stooks are called?


1)  stooks

2)  splits

3)  slices

40  judd


Q3)



The pillars formed during development are split into small pillars are called?

1)  stooks

2)  splits

3)  slices

4)  judd


Q4)


The pillar is splitted into 2 or more stooks if the pillar size is more than?


1)  15 X 15 sq.m

2)  18 X 18 sq.m

3)  20 X 20 sq.m

4)  25 X 25 sq.m

Q5)



Once the pillar extraction is commenced the splitting is of pillars may be done upto.....pillars ahead of the pillar is under extraction?


1)  1

2)  2

3)  3

4)  4


Q6)


During development the height of the gallery should not exceed?


1)  2m

2)  3m

3)  4m

4)  5m


Q7)


During extraction of coal the minimum thickness of the coal(rib) is left against the goaf is?


1)  1 m

2)  2 m

3)  3 m

4)  4 m


Q8)


With a good sandstone roof the area exposed may not more than .....sq.m at one stook extraction and ......sq.m if 3-4 stooks under extraciton?


1)  20 ; 400

2)  30 ; 600

3)  40 ; 900

4)  50 ; 900


Q9) 



The fall which takes place soon after whithdrawal of supports is called ?


1)  Local fall

2)  Main fall

3)  Air blast

4)  Rock burst


Q10)


During depillaring if the roof is laminated local fall occurs ....hours after the props are withdrawn?


1)  1-3

2)  3-6

3)  4-10

4)  10-14


ANSWERS FOR ABOVE QUESTIONS 



Q1)  1   Q2)  2    Q3)  1     Q4)   2      Q5)  2   


Q6)  2   Q7)  1    Q8)  3  Q9)   1       Q10)    3 






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Labels:

MINING ENGINEERING

WELCOME TO  MINING ENGINEERING 

HERE THE QUESTIONS FOR YOU MINING ENGINEERS   (Q1  to Q10) AND 

(ANSWERS ARE BELOW THE QUESTIONS)  

CLICK ON THE LINK  TO JOIN WhatsApp (GROUP) 

 https://chat.whatsapp.com/CQMdLDTRYlpJ4SvTdlctqy   ( OR) 










Q1) 



A face or working place which is parallel to main cleat is said to ?
1)  on end
2)  end cleat
3)  bord cleat
4)  wall
 
Q2)



The water bearing quality of a seam is measured by the ?
1)  quantity of water pumpued in a year
2)  total HP of the pumps installed
3)  rate of pumping per hour
4)  ratio between the quantity of water pumped and tonnes of coal produced
 
Q3)



In Indian mines the ratio of the quantity of water pumped from u/g workings to the quantity of coal produced varies?
1)  1 to 4
2)  1 to 20
3)  1 to 100
4)  1 to 200 


Q4)



The gradient in the cross cut should not be less than?
1)  1 in 4
2)  1 in 8
3)  1 in 10
4)  1 in 12 


Q5)



The average number of faces in a district if number of headings are 'N'?
1)  2N-1
2)  2(N-1)
3)  N-2
4)  2(N-2)


Q6)



Coal mine operations are prohibited if the common boundary is within ?
1)  15m
2)  10m
3)  7.5m
4)  5m


Q7)



Coal mine operations are prohibited if the cover is less than ?
1)  20m
2)  15m
3)  30m
4)  25m


Q8)



Coal seams said to be contiguous if the two seams are separated by a parting of less than ?
1)  3m
2)  6m
3)  9m
4)  10m


Q9) 



The minimum distance between two sections should be if one working at floor and one at top?
1)  3 m
2)  4 m
3)  5 m
4)  6 m 


Q10)



Drivage of two sets of roads and forming of pillar is known is?
1)  Working in the broken
2)  Working in the whole
3)  Longwall retreat
4)  Slicing



ANSWERS FOR ABOVE QUESTIONS 



Q1)  4   Q2)  4    Q3)  1     Q4)   4  Q5)  1   


Q6)  3   Q7)  2    Q8)  3  Q9)   1   Q10)    2 





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WELLCOME
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Labels:

MINING ENGINEERING

WELCOME TO  MINING ENGINEERING 

HERE THE QUESTIONS FOR YOU MINING ENGINEERS   (Q1  to Q10) AND 

(ANSWERS ARE BELOW THE QUESTIONS)  

CLICK ON THE LINK  TO JOIN WhatsApp (GROUP) 

 https://chat.whatsapp.com/CQMdLDTRYlpJ4SvTdlctqy   ( OR) 










Q1) 

The discharge velocity of the sand in pneumatic sand stowing?

1)  2 m/s
2)  10 m/s
3)  15 m/s
4)  20 m/s 

 
Q2)


The stowing rate in Mechanical sand stowing?

1)  50-60 tph
2)  60-70 tph
3)  70-80 tph
4)  80-90 tph
 
Q3)

There was no movement at the surface untill the face advances upto....m?

1)  15m
2)  22m
3)  30m
4)  35m,2

Q4)

The face must advance by approximately a distance of ....times the depth of the seam for the full subsidence to take place?

1)  1.4
2)  1.8
3)  2.5
4)  3

Q5)

The angle of inclination from vertical of the line connecting the edge of the workings and the edge of the subsidence area is called?

1)  Angle of fracture
2)  Angle of draw
3)  Breaking angle
4)  hade

Q6)

If the full subsidence is occured more than one point then the subsidence is called?

1)  critical subsidence
2)  subcritical subsidence
3)  supercritical subsidence
4)  trough subsidence

Q7)

The angle of draw in indian coal fields?

1)  upto 25 deg
2)  upto 35 deg
3)  upto 40 deg
4)  upto 45 deg

Q8)

With hydraulic sand stowing of the goaf the subsidence can be reduced to about ....of the amount caused by caving?

1)  1/2
2)  1/3
3)  1/4
4)  1/5

Q9) 

The critical width of extraction at which the subsidence at the bottom of the trough has a maxmimum possible value is?

1)  equal to depth
2)  1.3 X depth
3)  1.8 X depth
4)  2 X depth



Q10)

The minimum thickness of the coal seam for adopting Bord and pillar method of mining?

1)  1.0 m
2)  1.5 m
3)  2.0 m
4)  2.5 m



ANSWERS FOR ABOVE QUESTIONS 


Q1)  3   Q2)  1    Q3)  2     Q4)   1  Q5)  2   


Q6)  3   Q7)  2    Q8)  4  Q9)   2   Q10)    2 




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