THICK SEAM WORKING MULTIPLE CHOICE QUESTIONS

1. The thickness of the one slice in multisection extraction of thick seams?

1. 1.5 - 2 m
2. 2- 2.5 m
3. 2.4- 3 m
4. 3 - 3.5 m

2. Inclined slicing in decending order is applicable if the seam inclination is?

1. less than 35 deg
2. more than 35 deg
3. less than 45 deg
4. none

3. Roadway reultilisation is possible in .......... longwall face?

1. single unit
2. double unit
3. Z unit
4. none

4. maximum voltage is required for the longwall face?

1. 110v
2. 660v
3. 1100v
4. 3300v

5. Horizontal slicing method is applied if the seam thickness is?

1. less than 15m
2. more than 15m
3. less than 10m
4. more than 10m

6. The minimum thickness of the seam for adopting Blasting gallery method is?

1. 5m
2. 7m
3. 10m
4. 12m

7. The charge per hole in the BG method is?

1. 3kg
2. 4kg
3. 5kg
4. 7kg

8. The percentage of recovery in BG method is?

1. 50-60
2. 60-70
3. 70-80
4. 80-90

9. The holes in BG method are inclined .......... deg from the vertical towards the goaf?

1. 20
2. 35
3. 45
4. 60

10. In BG method the supports are installed upto ........... m from the face

1. 30
2. 40
3. 50
4. 60